diff --git a/pregelix-benchmark/pom.xml b/pregelix-benchmark/pom.xml
index 4d7d456..c1344ea 100644
--- a/pregelix-benchmark/pom.xml
+++ b/pregelix-benchmark/pom.xml
@@ -12,6 +12,42 @@
 	<artifactId>pregelix-benchmark</artifactId>
 	<name>pregelix-benchmark</name>
 	<url>http://maven.apache.org</url>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>2.0.2</version>
+				<configuration>
+					<source>1.7</source>
+					<target>1.7</target>
+					<fork>true</fork>
+				</configuration>
+			</plugin>
+
+			<plugin>
+				<artifactId>maven-assembly-plugin</artifactId>
+				<version>2.2-beta-5</version>
+				<configuration>
+					<descriptorRefs>
+						<descriptorRef>jar-with-dependencies</descriptorRef>
+					</descriptorRefs>
+				</configuration>
+				<executions>
+					<execution>
+						<id>make-my-jar-with-dependencies</id>
+						<phase>package</phase>
+						<goals>
+							<goal>single</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+
+
 	<dependencies>
 		<dependency>
 			<groupId>junit</groupId>
@@ -26,6 +62,12 @@
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
+			<groupId>org.apache.giraph</groupId>
+			<artifactId>giraph-examples</artifactId>
+			<version>1.0.0</version>
+			<scope>compile</scope>
+		</dependency>
+		<dependency>
 			<groupId>edu.uci.ics.hyracks</groupId>
 			<artifactId>hyracks-hdfs-core</artifactId>
 			<version>0.2.10-SNAPSHOT</version>
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/PageRankVertex.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/PageRankVertex.java
deleted file mode 100644
index 04c29de..0000000
--- a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/PageRankVertex.java
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
- * Copyright 2009-2013 by The Regents of the University of California
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * you may obtain a copy of the License from
- * 
- *     http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package edu.uci.ics.pregelix.benchmark;
-
-import org.apache.giraph.graph.Vertex;
-import org.apache.hadoop.io.DoubleWritable;
-import org.apache.hadoop.io.FloatWritable;
-import org.apache.hadoop.io.VLongWritable;
-
-/**
- * Demonstrates the basic Pregel PageRank implementation.
- */
-public class PageRankVertex extends Vertex<VLongWritable, DoubleWritable, FloatWritable, DoubleWritable> {
-
-    public static final String ITERATIONS = "HyracksPageRankVertex.iteration";
-    private final DoubleWritable vertexValue = new DoubleWritable();
-    private final DoubleWritable msg = new DoubleWritable();
-    private int maxIteration = -1;
-
-    @Override
-    public void compute(Iterable<DoubleWritable> msgIterator) {
-        if (maxIteration < 0) {
-            maxIteration = getContext().getConfiguration().getInt(ITERATIONS, 10);
-        }
-        if (getSuperstep() == 1) {
-            vertexValue.set(1.0 / getTotalNumVertices());
-        }
-        if (getSuperstep() >= 2 && getSuperstep() <= maxIteration) {
-            double sum = 0;
-            for (DoubleWritable msg : msgIterator) {
-                sum += msg.get();
-            }
-            vertexValue.set((0.15 / getTotalNumVertices()) + 0.85 * sum);
-        }
-
-        if (getSuperstep() >= 1 && getSuperstep() < maxIteration) {
-            long edges = getNumEdges();
-            msg.set(vertexValue.get() / edges);
-            sendMessageToAllEdges(msg);
-        } else {
-            voteToHalt();
-        }
-    }
-
-}
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextCCInputFormat.java
similarity index 60%
copy from pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
copy to pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextCCInputFormat.java
index 3d85f66..b290907 100644
--- a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextCCInputFormat.java
@@ -12,7 +12,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.pregelix.benchmark;
+
+package edu.uci.ics.pregelix.benchmark.io;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -24,14 +25,13 @@
 import org.apache.giraph.edge.Edge;
 import org.apache.giraph.edge.MapMutableEdge;
 import org.apache.giraph.io.formats.TextVertexInputFormat;
-import org.apache.hadoop.io.DoubleWritable;
-import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.io.Text;
-import org.apache.hadoop.io.VLongWritable;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 
-public class TextPageRankInputFormat extends TextVertexInputFormat<VLongWritable, DoubleWritable, FloatWritable> {
+public class TextCCInputFormat extends TextVertexInputFormat<LongWritable, LongWritable, NullWritable> {
 
     @Override
     public TextVertexReader createVertexReader(InputSplit split, TaskAttemptContext context) throws IOException {
@@ -39,25 +39,25 @@
             String[] items;
 
             @Override
-            protected VLongWritable getId(Text line) throws IOException {
+            protected LongWritable getId(Text line) throws IOException {
                 items = line.toString().split(" ");
-                return new VLongWritable(Long.parseLong(items[0]));
+                return new LongWritable(Long.parseLong(items[0]));
             }
 
             @Override
-            protected DoubleWritable getValue(Text line) throws IOException {
+            protected LongWritable getValue(Text line) throws IOException {
                 return null;
             }
 
             @Override
-            protected Iterable<Edge<VLongWritable, FloatWritable>> getEdges(Text line) throws IOException {
-                List<Edge<VLongWritable, FloatWritable>> edges = new ArrayList<Edge<VLongWritable, FloatWritable>>();
-                Map<VLongWritable, FloatWritable> edgeMap = new HashMap<VLongWritable, FloatWritable>();
+            protected Iterable<Edge<LongWritable, NullWritable>> getEdges(Text line) throws IOException {
+                List<Edge<LongWritable, NullWritable>> edges = new ArrayList<Edge<LongWritable, NullWritable>>();
+                Map<LongWritable, NullWritable> edgeMap = new HashMap<LongWritable, NullWritable>();
                 for (int i = 1; i < items.length; i++) {
-                    edgeMap.put(new VLongWritable(Long.parseLong(items[i])), null);
+                    edgeMap.put(new LongWritable(Long.parseLong(items[i])), null);
                 }
-                for (Entry<VLongWritable, FloatWritable> entry : edgeMap.entrySet()) {
-                    MapMutableEdge<VLongWritable, FloatWritable> edge = new MapMutableEdge<VLongWritable, FloatWritable>();
+                for (Entry<LongWritable, NullWritable> entry : edgeMap.entrySet()) {
+                    MapMutableEdge<LongWritable, NullWritable> edge = new MapMutableEdge<LongWritable, NullWritable>();
                     edge.setEntry(entry);
                     edge.setValue(null);
                     edges.add(edge);
@@ -67,4 +67,5 @@
 
         };
     }
+
 }
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextCCOutputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextCCOutputFormat.java
new file mode 100644
index 0000000..770c6e1
--- /dev/null
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextCCOutputFormat.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.benchmark.io;
+
+import java.io.IOException;
+
+import org.apache.giraph.graph.Vertex;
+import org.apache.giraph.io.formats.TextVertexOutputFormat;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.TaskAttemptContext;
+
+public class TextCCOutputFormat extends TextVertexOutputFormat<LongWritable, LongWritable, NullWritable> {
+
+    @Override
+    public TextVertexWriter createVertexWriter(TaskAttemptContext context) throws IOException, InterruptedException {
+        return new TextVertexWriterToEachLine() {
+
+            @Override
+            protected Text convertVertexToLine(Vertex<LongWritable, LongWritable, NullWritable, ?> vertex)
+                    throws IOException {
+                return new Text(vertex.getId() + " " + vertex.getValue());
+            }
+
+        };
+    }
+
+}
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextPRInputFormat.java
similarity index 64%
copy from pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
copy to pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextPRInputFormat.java
index 3d85f66..38eef3a 100644
--- a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextPRInputFormat.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.pregelix.benchmark;
+package edu.uci.ics.pregelix.benchmark.io;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -25,13 +25,13 @@
 import org.apache.giraph.edge.MapMutableEdge;
 import org.apache.giraph.io.formats.TextVertexInputFormat;
 import org.apache.hadoop.io.DoubleWritable;
-import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.io.Text;
-import org.apache.hadoop.io.VLongWritable;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 
-public class TextPageRankInputFormat extends TextVertexInputFormat<VLongWritable, DoubleWritable, FloatWritable> {
+public class TextPRInputFormat extends TextVertexInputFormat<LongWritable, DoubleWritable, NullWritable> {
 
     @Override
     public TextVertexReader createVertexReader(InputSplit split, TaskAttemptContext context) throws IOException {
@@ -39,9 +39,9 @@
             String[] items;
 
             @Override
-            protected VLongWritable getId(Text line) throws IOException {
+            protected LongWritable getId(Text line) throws IOException {
                 items = line.toString().split(" ");
-                return new VLongWritable(Long.parseLong(items[0]));
+                return new LongWritable(Long.parseLong(items[0]));
             }
 
             @Override
@@ -50,14 +50,14 @@
             }
 
             @Override
-            protected Iterable<Edge<VLongWritable, FloatWritable>> getEdges(Text line) throws IOException {
-                List<Edge<VLongWritable, FloatWritable>> edges = new ArrayList<Edge<VLongWritable, FloatWritable>>();
-                Map<VLongWritable, FloatWritable> edgeMap = new HashMap<VLongWritable, FloatWritable>();
+            protected Iterable<Edge<LongWritable, NullWritable>> getEdges(Text line) throws IOException {
+                List<Edge<LongWritable, NullWritable>> edges = new ArrayList<Edge<LongWritable, NullWritable>>();
+                Map<LongWritable, NullWritable> edgeMap = new HashMap<LongWritable, NullWritable>();
                 for (int i = 1; i < items.length; i++) {
-                    edgeMap.put(new VLongWritable(Long.parseLong(items[i])), null);
+                    edgeMap.put(new LongWritable(Long.parseLong(items[i])), null);
                 }
-                for (Entry<VLongWritable, FloatWritable> entry : edgeMap.entrySet()) {
-                    MapMutableEdge<VLongWritable, FloatWritable> edge = new MapMutableEdge<VLongWritable, FloatWritable>();
+                for (Entry<LongWritable, NullWritable> entry : edgeMap.entrySet()) {
+                    MapMutableEdge<LongWritable, NullWritable> edge = new MapMutableEdge<LongWritable, NullWritable>();
                     edge.setEntry(entry);
                     edge.setValue(null);
                     edges.add(edge);
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextPROutputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextPROutputFormat.java
new file mode 100644
index 0000000..b14de6f
--- /dev/null
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextPROutputFormat.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.benchmark.io;
+
+import java.io.IOException;
+
+import org.apache.giraph.graph.Vertex;
+import org.apache.giraph.io.formats.TextVertexOutputFormat;
+import org.apache.hadoop.io.DoubleWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.TaskAttemptContext;
+
+public class TextPROutputFormat extends TextVertexOutputFormat<LongWritable, DoubleWritable, NullWritable> {
+
+    @Override
+    public TextVertexWriter createVertexWriter(TaskAttemptContext context) throws IOException, InterruptedException {
+        return new TextVertexWriterToEachLine() {
+
+            @Override
+            protected Text convertVertexToLine(Vertex<LongWritable, DoubleWritable, NullWritable, ?> vertex)
+                    throws IOException {
+                return new Text(vertex.getId() + " " + vertex.getValue());
+            }
+
+        };
+    }
+
+}
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextSPInputFormat.java
similarity index 65%
rename from pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
rename to pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextSPInputFormat.java
index 3d85f66..953e93c 100644
--- a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io/TextSPInputFormat.java
@@ -12,7 +12,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.pregelix.benchmark;
+
+package edu.uci.ics.pregelix.benchmark.io;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -25,13 +26,12 @@
 import org.apache.giraph.edge.MapMutableEdge;
 import org.apache.giraph.io.formats.TextVertexInputFormat;
 import org.apache.hadoop.io.DoubleWritable;
-import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.LongWritable;
 import org.apache.hadoop.io.Text;
-import org.apache.hadoop.io.VLongWritable;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 
-public class TextPageRankInputFormat extends TextVertexInputFormat<VLongWritable, DoubleWritable, FloatWritable> {
+public class TextSPInputFormat extends TextVertexInputFormat<LongWritable, DoubleWritable, DoubleWritable> {
 
     @Override
     public TextVertexReader createVertexReader(InputSplit split, TaskAttemptContext context) throws IOException {
@@ -39,9 +39,9 @@
             String[] items;
 
             @Override
-            protected VLongWritable getId(Text line) throws IOException {
+            protected LongWritable getId(Text line) throws IOException {
                 items = line.toString().split(" ");
-                return new VLongWritable(Long.parseLong(items[0]));
+                return new LongWritable(Long.parseLong(items[0]));
             }
 
             @Override
@@ -50,16 +50,16 @@
             }
 
             @Override
-            protected Iterable<Edge<VLongWritable, FloatWritable>> getEdges(Text line) throws IOException {
-                List<Edge<VLongWritable, FloatWritable>> edges = new ArrayList<Edge<VLongWritable, FloatWritable>>();
-                Map<VLongWritable, FloatWritable> edgeMap = new HashMap<VLongWritable, FloatWritable>();
+            protected Iterable<Edge<LongWritable, DoubleWritable>> getEdges(Text line) throws IOException {
+                List<Edge<LongWritable, DoubleWritable>> edges = new ArrayList<Edge<LongWritable, DoubleWritable>>();
+                Map<LongWritable, DoubleWritable> edgeMap = new HashMap<LongWritable, DoubleWritable>();
                 for (int i = 1; i < items.length; i++) {
-                    edgeMap.put(new VLongWritable(Long.parseLong(items[i])), null);
+                    edgeMap.put(new LongWritable(Long.parseLong(items[i])), null);
                 }
-                for (Entry<VLongWritable, FloatWritable> entry : edgeMap.entrySet()) {
-                    MapMutableEdge<VLongWritable, FloatWritable> edge = new MapMutableEdge<VLongWritable, FloatWritable>();
+                for (Entry<LongWritable, DoubleWritable> entry : edgeMap.entrySet()) {
+                    MapMutableEdge<LongWritable, DoubleWritable> edge = new MapMutableEdge<LongWritable, DoubleWritable>();
                     edge.setEntry(entry);
-                    edge.setValue(null);
+                    edge.setValue(new DoubleWritable(1.0));
                     edges.add(edge);
                 }
                 return edges;
@@ -67,4 +67,5 @@
 
         };
     }
+
 }
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextCCInputFormat2.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextCCInputFormat2.java
new file mode 100644
index 0000000..0a70b3c
--- /dev/null
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextCCInputFormat2.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.benchmark.io2;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.apache.giraph.edge.Edge;
+import org.apache.giraph.edge.MapMutableEdge;
+import org.apache.giraph.io.formats.TextVertexInputFormat;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.InputSplit;
+import org.apache.hadoop.mapreduce.TaskAttemptContext;
+
+public class TextCCInputFormat2 extends TextVertexInputFormat<LongWritable, LongWritable, NullWritable> {
+
+    @Override
+    public TextVertexReader createVertexReader(InputSplit split, TaskAttemptContext context) throws IOException {
+        return new TextVertexReaderFromEachLine() {
+            String[] items;
+
+            @Override
+            protected LongWritable getId(Text line) throws IOException {
+                String[] kv = line.toString().split("\t");
+                items = kv[1].split(" ");
+                return new LongWritable(Long.parseLong(kv[0]));
+            }
+
+            @Override
+            protected LongWritable getValue(Text line) throws IOException {
+                return null;
+            }
+
+            @Override
+            protected Iterable<Edge<LongWritable, NullWritable>> getEdges(Text line) throws IOException {
+                List<Edge<LongWritable, NullWritable>> edges = new ArrayList<Edge<LongWritable, NullWritable>>();
+                Map<LongWritable, NullWritable> edgeMap = new HashMap<LongWritable, NullWritable>();
+                for (int i = 1; i < items.length; i++) {
+                    edgeMap.put(new LongWritable(Long.parseLong(items[i])), null);
+                }
+                for (Entry<LongWritable, NullWritable> entry : edgeMap.entrySet()) {
+                    MapMutableEdge<LongWritable, NullWritable> edge = new MapMutableEdge<LongWritable, NullWritable>();
+                    edge.setEntry(entry);
+                    edge.setValue(null);
+                    edges.add(edge);
+                }
+                return edges;
+            }
+
+        };
+    }
+
+}
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextPRInputFormat2.java
similarity index 62%
copy from pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
copy to pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextPRInputFormat2.java
index 3d85f66..63a4519 100644
--- a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextPRInputFormat2.java
@@ -12,7 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.pregelix.benchmark;
+package edu.uci.ics.pregelix.benchmark.io2;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -25,13 +25,13 @@
 import org.apache.giraph.edge.MapMutableEdge;
 import org.apache.giraph.io.formats.TextVertexInputFormat;
 import org.apache.hadoop.io.DoubleWritable;
-import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
 import org.apache.hadoop.io.Text;
-import org.apache.hadoop.io.VLongWritable;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 
-public class TextPageRankInputFormat extends TextVertexInputFormat<VLongWritable, DoubleWritable, FloatWritable> {
+public class TextPRInputFormat2 extends TextVertexInputFormat<LongWritable, DoubleWritable, NullWritable> {
 
     @Override
     public TextVertexReader createVertexReader(InputSplit split, TaskAttemptContext context) throws IOException {
@@ -39,9 +39,10 @@
             String[] items;
 
             @Override
-            protected VLongWritable getId(Text line) throws IOException {
-                items = line.toString().split(" ");
-                return new VLongWritable(Long.parseLong(items[0]));
+            protected LongWritable getId(Text line) throws IOException {
+                String[] kv = line.toString().split("\t");
+                items = kv[1].split(" ");
+                return new LongWritable(Long.parseLong(items[0]));
             }
 
             @Override
@@ -50,14 +51,14 @@
             }
 
             @Override
-            protected Iterable<Edge<VLongWritable, FloatWritable>> getEdges(Text line) throws IOException {
-                List<Edge<VLongWritable, FloatWritable>> edges = new ArrayList<Edge<VLongWritable, FloatWritable>>();
-                Map<VLongWritable, FloatWritable> edgeMap = new HashMap<VLongWritable, FloatWritable>();
+            protected Iterable<Edge<LongWritable, NullWritable>> getEdges(Text line) throws IOException {
+                List<Edge<LongWritable, NullWritable>> edges = new ArrayList<Edge<LongWritable, NullWritable>>();
+                Map<LongWritable, NullWritable> edgeMap = new HashMap<LongWritable, NullWritable>();
                 for (int i = 1; i < items.length; i++) {
-                    edgeMap.put(new VLongWritable(Long.parseLong(items[i])), null);
+                    edgeMap.put(new LongWritable(Long.parseLong(items[i])), null);
                 }
-                for (Entry<VLongWritable, FloatWritable> entry : edgeMap.entrySet()) {
-                    MapMutableEdge<VLongWritable, FloatWritable> edge = new MapMutableEdge<VLongWritable, FloatWritable>();
+                for (Entry<LongWritable, NullWritable> entry : edgeMap.entrySet()) {
+                    MapMutableEdge<LongWritable, NullWritable> edge = new MapMutableEdge<LongWritable, NullWritable>();
                     edge.setEntry(entry);
                     edge.setValue(null);
                     edges.add(edge);
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextSPInputFormat2.java
similarity index 63%
copy from pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
copy to pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextSPInputFormat2.java
index 3d85f66..fdb1061 100644
--- a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/TextPageRankInputFormat.java
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/io2/TextSPInputFormat2.java
@@ -12,7 +12,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package edu.uci.ics.pregelix.benchmark;
+
+package edu.uci.ics.pregelix.benchmark.io2;
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -25,13 +26,12 @@
 import org.apache.giraph.edge.MapMutableEdge;
 import org.apache.giraph.io.formats.TextVertexInputFormat;
 import org.apache.hadoop.io.DoubleWritable;
-import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.LongWritable;
 import org.apache.hadoop.io.Text;
-import org.apache.hadoop.io.VLongWritable;
 import org.apache.hadoop.mapreduce.InputSplit;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 
-public class TextPageRankInputFormat extends TextVertexInputFormat<VLongWritable, DoubleWritable, FloatWritable> {
+public class TextSPInputFormat2 extends TextVertexInputFormat<LongWritable, DoubleWritable, DoubleWritable> {
 
     @Override
     public TextVertexReader createVertexReader(InputSplit split, TaskAttemptContext context) throws IOException {
@@ -39,9 +39,10 @@
             String[] items;
 
             @Override
-            protected VLongWritable getId(Text line) throws IOException {
-                items = line.toString().split(" ");
-                return new VLongWritable(Long.parseLong(items[0]));
+            protected LongWritable getId(Text line) throws IOException {
+                String[] kv = line.toString().split("\t");
+                items = kv[1].split(" ");
+                return new LongWritable(Long.parseLong(kv[0]));
             }
 
             @Override
@@ -50,16 +51,16 @@
             }
 
             @Override
-            protected Iterable<Edge<VLongWritable, FloatWritable>> getEdges(Text line) throws IOException {
-                List<Edge<VLongWritable, FloatWritable>> edges = new ArrayList<Edge<VLongWritable, FloatWritable>>();
-                Map<VLongWritable, FloatWritable> edgeMap = new HashMap<VLongWritable, FloatWritable>();
+            protected Iterable<Edge<LongWritable, DoubleWritable>> getEdges(Text line) throws IOException {
+                List<Edge<LongWritable, DoubleWritable>> edges = new ArrayList<Edge<LongWritable, DoubleWritable>>();
+                Map<LongWritable, DoubleWritable> edgeMap = new HashMap<LongWritable, DoubleWritable>();
                 for (int i = 1; i < items.length; i++) {
-                    edgeMap.put(new VLongWritable(Long.parseLong(items[i])), null);
+                    edgeMap.put(new LongWritable(Long.parseLong(items[i])), null);
                 }
-                for (Entry<VLongWritable, FloatWritable> entry : edgeMap.entrySet()) {
-                    MapMutableEdge<VLongWritable, FloatWritable> edge = new MapMutableEdge<VLongWritable, FloatWritable>();
+                for (Entry<LongWritable, DoubleWritable> entry : edgeMap.entrySet()) {
+                    MapMutableEdge<LongWritable, DoubleWritable> edge = new MapMutableEdge<LongWritable, DoubleWritable>();
                     edge.setEntry(entry);
-                    edge.setValue(null);
+                    edge.setValue(new DoubleWritable(1.0));
                     edges.add(edge);
                 }
                 return edges;
@@ -67,4 +68,5 @@
 
         };
     }
+
 }
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/ConnectedComponentsVertex.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/ConnectedComponentsVertex.java
new file mode 100644
index 0000000..3789d6d
--- /dev/null
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/ConnectedComponentsVertex.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.benchmark.vertex;
+
+import java.io.IOException;
+
+import org.apache.giraph.edge.Edge;
+import org.apache.giraph.graph.Vertex;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+
+public class ConnectedComponentsVertex extends Vertex<LongWritable, LongWritable, NullWritable, LongWritable> {
+    /**
+     * Propagates the smallest vertex id to all neighbors. Will always choose to
+     * halt and only reactivate if a smaller id has been sent to it.
+     * 
+     * @param messages
+     *            Iterator of messages from the previous superstep.
+     * @throws IOException
+     */
+    @Override
+    public void compute(Iterable<LongWritable> messages) throws IOException {
+        long currentComponent = getValue().get();
+
+        // First superstep is special, because we can simply look at the neighbors
+        if (getSuperstep() == 0) {
+            for (Edge<LongWritable, NullWritable> edge : getEdges()) {
+                long neighbor = edge.getTargetVertexId().get();
+                if (neighbor < currentComponent) {
+                    currentComponent = neighbor;
+                }
+            }
+            // Only need to send value if it is not the own id
+            if (currentComponent != getValue().get()) {
+                setValue(new LongWritable(currentComponent));
+                for (Edge<LongWritable, NullWritable> edge : getEdges()) {
+                    LongWritable neighbor = edge.getTargetVertexId();
+                    if (neighbor.get() > currentComponent) {
+                        sendMessage(neighbor, getValue());
+                    }
+                }
+            }
+
+            voteToHalt();
+            return;
+        }
+
+        boolean changed = false;
+        // did we get a smaller id ?
+        for (LongWritable message : messages) {
+            long candidateComponent = message.get();
+            if (candidateComponent < currentComponent) {
+                currentComponent = candidateComponent;
+                changed = true;
+            }
+        }
+
+        // propagate new component id to the neighbors
+        if (changed) {
+            setValue(new LongWritable(currentComponent));
+            sendMessageToAllEdges(getValue());
+        }
+        voteToHalt();
+    }
+}
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/PageRankVertex.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/PageRankVertex.java
new file mode 100644
index 0000000..86e90dd
--- /dev/null
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/PageRankVertex.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.benchmark.vertex;
+
+import org.apache.giraph.edge.Edge;
+import org.apache.giraph.examples.RandomWalkVertex;
+import org.apache.giraph.utils.MathUtils;
+import org.apache.hadoop.io.DoubleWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.NullWritable;
+
+/**
+ * The PageRank algorithm, with uniform transition probabilities on the edges
+ * http://en.wikipedia.org/wiki/PageRank
+ */
+public class PageRankVertex extends RandomWalkVertex<NullWritable> {
+
+    @Override
+    protected double transitionProbability(double stateProbability, Edge<LongWritable, NullWritable> edge) {
+        return stateProbability / getNumEdges();
+    }
+
+    @Override
+    protected double recompute(Iterable<DoubleWritable> partialRanks, double teleportationProbability) {
+
+        // rank contribution from incident neighbors
+        double rankFromNeighbors = MathUtils.sum(partialRanks);
+        // rank contribution from dangling vertices
+        double danglingContribution = getDanglingProbability() / getTotalNumVertices();
+
+        // recompute rank
+        return (1d - teleportationProbability) * (rankFromNeighbors + danglingContribution) + teleportationProbability
+                / getTotalNumVertices();
+    }
+}
diff --git a/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/ShortestPathsVertex.java b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/ShortestPathsVertex.java
new file mode 100644
index 0000000..755a3d0
--- /dev/null
+++ b/pregelix-benchmark/src/main/java/edu/uci/ics/pregelix/benchmark/vertex/ShortestPathsVertex.java
@@ -0,0 +1,62 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.benchmark.vertex;
+
+import java.io.IOException;
+
+import org.apache.giraph.edge.Edge;
+import org.apache.giraph.graph.Vertex;
+import org.apache.hadoop.io.DoubleWritable;
+import org.apache.hadoop.io.LongWritable;
+
+/**
+ * Shortest paths algorithm.
+ */
+public class ShortestPathsVertex extends Vertex<LongWritable, DoubleWritable, DoubleWritable, DoubleWritable> {
+    /** Source id. */
+    public static final String SOURCE_ID = "giraph.shortestPathsBenchmark.sourceId";
+    /** Default source id. */
+    public static final long SOURCE_ID_DEFAULT = 1;
+
+    private boolean isSource() {
+        return getId().get() == getConf().getLong(SOURCE_ID, SOURCE_ID_DEFAULT);
+    }
+
+    @Override
+    public void compute(Iterable<DoubleWritable> messages) throws IOException {
+        if (getSuperstep() == 0) {
+            setValue(new DoubleWritable(Double.MAX_VALUE));
+        }
+
+        double minDist = isSource() ? 0d : Double.MAX_VALUE;
+        for (DoubleWritable message : messages) {
+            minDist = Math.min(minDist, message.get());
+        }
+
+        if (minDist < getValue().get()) {
+            setValue(new DoubleWritable(minDist));
+            for (Edge<LongWritable, DoubleWritable> edge : getEdges()) {
+                double distance = minDist + edge.getValue().get();
+                sendMessage(edge.getTargetVertexId(), new DoubleWritable(distance));
+            }
+        }
+
+        voteToHalt();
+    }
+}
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGen.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGen.java
index a577bdb..b345e01 100644
--- a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGen.java
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGen.java
@@ -65,6 +65,7 @@
 import edu.uci.ics.hyracks.dataflow.std.file.FileSplit;
 import edu.uci.ics.hyracks.dataflow.std.file.IFileSplitProvider;
 import edu.uci.ics.hyracks.dataflow.std.misc.ConstantTupleSourceOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.sort.Algorithm;
 import edu.uci.ics.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 import edu.uci.ics.hyracks.hdfs2.dataflow.HDFSReadOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.btree.dataflow.BTreeDataflowHelperFactory;
@@ -97,7 +98,8 @@
 import edu.uci.ics.pregelix.core.data.TypeTraits;
 import edu.uci.ics.pregelix.core.hadoop.config.ConfigurationFactory;
 import edu.uci.ics.pregelix.core.jobgen.clusterconfig.ClusterConfig;
-import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawNormalizedKeyComputerFactory;
 import edu.uci.ics.pregelix.core.util.DataflowUtils;
 import edu.uci.ics.pregelix.dataflow.ClearStateOperatorDescriptor;
 import edu.uci.ics.pregelix.dataflow.EmptySinkOperatorDescriptor;
@@ -204,17 +206,14 @@
         return jobId;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     public JobSpecification generateCreatingJob() throws HyracksException {
-        Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
         JobSpecification spec = new JobSpecification();
         ITypeTraits[] typeTraits = new ITypeTraits[2];
         typeTraits[0] = new TypeTraits(false);
         typeTraits[1] = new TypeTraits(false);
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
 
         int[] keyFields = new int[1];
         keyFields[0] = 0;
@@ -272,8 +271,7 @@
         sortFields[0] = 0;
         INormalizedKeyComputerFactory nkmFactory = JobGenUtil.getINormalizedKeyComputerFactory(conf);
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         ExternalSortOperatorDescriptor sorter = new ExternalSortOperatorDescriptor(spec, maxFrameLimit, sortFields,
                 nkmFactory, comparatorFactories, recordDescriptor);
         ClusterConfig.setLocationConstraint(spec, sorter);
@@ -299,12 +297,12 @@
         ITuplePartitionComputerFactory hashPartitionComputerFactory = getVertexPartitionComputerFactory();
         spec.connect(new OneToOneConnectorDescriptor(spec), scanner, 0, sorter, 0);
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, hashPartitionComputerFactory, sortFields,
-                comparatorFactories), sorter, 0, writer, 0);
+                comparatorFactories, nkmFactory), sorter, 0, writer, 0);
         spec.setFrameSize(frameSize);
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
+    @SuppressWarnings({ "rawtypes" })
     public JobSpecification scanIndexPrintGraph(String nodeName, String path) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
         Class<? extends Writable> vertexClass = BspUtils.getVertexClass(conf);
@@ -332,8 +330,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), vertexClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         IFileSplitProvider fileSplitProvider = ClusterConfig.getFileSplitProvider(jobId, PRIMARY_INDEX);
         ITypeTraits[] typeTraits = new ITypeTraits[2];
         typeTraits[0] = new TypeTraits(false);
@@ -363,16 +360,17 @@
          */
         int[] sortFields = new int[1];
         sortFields[0] = 0;
+        INormalizedKeyComputerFactory nkmFactory = JobGenUtil.getINormalizedKeyComputerFactory(conf);
         ITuplePartitionComputerFactory hashPartitionComputerFactory = getVertexPartitionComputerFactory();
         spec.connect(new OneToOneConnectorDescriptor(spec), emptyTupleSource, 0, scanner, 0);
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, hashPartitionComputerFactory, sortFields,
-                comparatorFactories), scanner, 0, writer, 0);
+                comparatorFactories, nkmFactory), scanner, 0, writer, 0);
         spec.setFrameSize(frameSize);
         return spec;
     }
 
     public JobSpecification scanIndexWriteGraph() throws HyracksException {
-        JobSpecification spec = scanIndexWriteToHDFS(conf);
+        JobSpecification spec = scanIndexWriteToHDFS(conf, false);
         return spec;
     }
 
@@ -388,7 +386,7 @@
             FileSystem dfs = FileSystem.get(tmpJob.getConfiguration());
 
             dfs.delete(new Path(BspUtils.getVertexCheckpointPath(conf, lastSuccessfulIteration)), true);
-            JobSpecification vertexCkpSpec = scanIndexWriteToHDFS(tmpJob.getConfiguration());
+            JobSpecification vertexCkpSpec = scanIndexWriteToHDFS(tmpJob.getConfiguration(), true);
 
             dfs.delete(new Path(BspUtils.getMessageCheckpointPath(conf, lastSuccessfulIteration)), true);
             JobSpecification[] stateCkpSpecs = generateStateCheckpointing(lastSuccessfulIteration);
@@ -531,10 +529,9 @@
          */
         int[] sortFields = new int[1];
         sortFields[0] = 0;
-        INormalizedKeyComputerFactory nkmFactory = JobGenUtil.getINormalizedKeyComputerFactory(conf);
+        INormalizedKeyComputerFactory nkmFactory = RawNormalizedKeyComputerFactory.INSTANCE;
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         ExternalSortOperatorDescriptor sorter = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, sortFields,
                 nkmFactory, comparatorFactories, recordDescriptor);
         ClusterConfig.setLocationConstraint(spec, sorter);
@@ -564,8 +561,9 @@
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
-    private JobSpecification scanIndexWriteToHDFS(Configuration conf) throws HyracksDataException, HyracksException {
+    @SuppressWarnings({ "rawtypes" })
+    private JobSpecification scanIndexWriteToHDFS(Configuration conf, boolean ckpointing) throws HyracksDataException,
+            HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
         Class<? extends Writable> vertexClass = BspUtils.getVertexClass(conf);
         JobSpecification spec = new JobSpecification();
@@ -592,8 +590,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), vertexClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         IFileSplitProvider fileSplitProvider = ClusterConfig.getFileSplitProvider(jobId, PRIMARY_INDEX);
 
         ITypeTraits[] typeTraits = new ITypeTraits[2];
@@ -605,6 +602,18 @@
                 null, null, true, true, getIndexDataflowHelperFactory(), false, NoOpOperationCallbackFactory.INSTANCE);
         ClusterConfig.setLocationConstraint(spec, scanner);
 
+        ExternalSortOperatorDescriptor sort = null;
+        if (!ckpointing) {
+            int[] keyFields = new int[] { 0 };
+            INormalizedKeyComputerFactory nkmFactory = JobGenUtil.getFinalNormalizedKeyComputerFactory(conf);
+            IBinaryComparatorFactory[] sortCmpFactories = new IBinaryComparatorFactory[1];
+            sortCmpFactories[0] = JobGenUtil.getFinalBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
+                    .getClass());
+            sort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields, nkmFactory, sortCmpFactories,
+                    recordDescriptor);
+            ClusterConfig.setLocationConstraint(spec, scanner);
+        }
+
         /**
          * construct write file operator
          */
@@ -618,7 +627,12 @@
          * connect operator descriptors
          */
         spec.connect(new OneToOneConnectorDescriptor(spec), emptyTupleSource, 0, scanner, 0);
-        spec.connect(new OneToOneConnectorDescriptor(spec), scanner, 0, writer, 0);
+        if (!ckpointing) {
+            spec.connect(new OneToOneConnectorDescriptor(spec), scanner, 0, sort, 0);
+            spec.connect(new OneToOneConnectorDescriptor(spec), sort, 0, writer, 0);
+        } else {
+            spec.connect(new OneToOneConnectorDescriptor(spec), scanner, 0, writer, 0);
+        }
         spec.setFrameSize(frameSize);
         return spec;
     }
@@ -723,7 +737,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(lastCheckpointedIteration,
                 WritableComparator.get(vertexIdClass).getClass());
         ExternalSortOperatorDescriptor sort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, recordDescriptor);
+                nkmFactory, sortCmpFactories, recordDescriptor, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, sort);
 
         /**
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenInnerJoin.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenInnerJoin.java
index 9389f62..103c1b6 100644
--- a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenInnerJoin.java
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenInnerJoin.java
@@ -50,6 +50,7 @@
 import edu.uci.ics.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.file.IFileSplitProvider;
 import edu.uci.ics.hyracks.dataflow.std.misc.ConstantTupleSourceOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.sort.Algorithm;
 import edu.uci.ics.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 import edu.uci.ics.hyracks.hdfs2.dataflow.HDFSReadOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.btree.dataflow.BTreeSearchOperatorDescriptor;
@@ -62,7 +63,7 @@
 import edu.uci.ics.pregelix.core.data.TypeTraits;
 import edu.uci.ics.pregelix.core.hadoop.config.ConfigurationFactory;
 import edu.uci.ics.pregelix.core.jobgen.clusterconfig.ClusterConfig;
-import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory;
 import edu.uci.ics.pregelix.core.util.DataflowUtils;
 import edu.uci.ics.pregelix.dataflow.ConnectorPolicyAssignmentPolicy;
 import edu.uci.ics.pregelix.dataflow.EmptySinkOperatorDescriptor;
@@ -97,7 +98,6 @@
         super(job);
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     protected JobSpecification generateFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
         Class<? extends Writable> vertexClass = BspUtils.getVertexClass(conf);
@@ -129,8 +129,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), vertexClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
 
         ITypeTraits[] typeTraits = new ITypeTraits[2];
         typeTraits[0] = new TypeTraits(false);
@@ -195,7 +194,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor localSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, localSort);
 
         /**
@@ -282,8 +281,8 @@
 
         spec.connect(new MToNPartitioningConnectorDescriptor(spec, partionFactory), scanner, 5, btreeBulkLoad, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), localSort, 0, localGby, 0);
-        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories),
-                localGby, 0, globalGby, 0);
+        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories,
+                nkmFactory), localGby, 0, globalGby, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), globalGby, 0, materialize, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), materialize, 0, postSuperStep, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), postSuperStep, 0, emptySink, 0);
@@ -300,7 +299,6 @@
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateNonFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -316,8 +314,7 @@
         RecordDescriptor rdUnnestedMessage = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), messageValueClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         RecordDescriptor rdFinal = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
                 MsgList.class.getName());
         RecordDescriptor rdInsert = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
@@ -401,7 +398,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor localSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, localSort);
 
         /**
@@ -503,8 +500,8 @@
 
         spec.connect(new MToNPartitioningConnectorDescriptor(spec, partionFactory), join, 5, btreeBulkLoad, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), localSort, 0, localGby, 0);
-        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories),
-                localGby, 0, globalGby, 0);
+        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories,
+                nkmFactory), localGby, 0, globalGby, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), globalGby, 0, materialize, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), materialize, 0, postSuperStep, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), postSuperStep, 0, emptySink, 0);
@@ -601,7 +598,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(lastSuccessfulIteration,
                 WritableComparator.get(vertexIdClass).getClass());
         ExternalSortOperatorDescriptor sort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, recordDescriptor);
+                nkmFactory, sortCmpFactories, recordDescriptor, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, sort);
 
         /**
@@ -633,7 +630,7 @@
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
+    @SuppressWarnings({ "rawtypes" })
     private JobSpecification generateSecondaryBTreeCheckpoint(int lastSuccessfulIteration, PregelixJob job)
             throws HyracksException {
         job.setOutputFormatClass(SequenceFileOutputFormat.class);
@@ -668,8 +665,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), msgListClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
 
         ITypeTraits[] typeTraits = new ITypeTraits[2];
         typeTraits[0] = new TypeTraits(false);
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoin.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoin.java
index 287b797..308f422 100644
--- a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoin.java
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoin.java
@@ -32,6 +32,7 @@
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningMergingConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.file.IFileSplitProvider;
+import edu.uci.ics.hyracks.dataflow.std.sort.Algorithm;
 import edu.uci.ics.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexInsertUpdateDeleteOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallbackFactory;
@@ -42,7 +43,7 @@
 import edu.uci.ics.pregelix.core.data.TypeTraits;
 import edu.uci.ics.pregelix.core.hadoop.config.ConfigurationFactory;
 import edu.uci.ics.pregelix.core.jobgen.clusterconfig.ClusterConfig;
-import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory;
 import edu.uci.ics.pregelix.core.util.DataflowUtils;
 import edu.uci.ics.pregelix.dataflow.ConnectorPolicyAssignmentPolicy;
 import edu.uci.ics.pregelix.dataflow.EmptySinkOperatorDescriptor;
@@ -74,7 +75,6 @@
         super(job);
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -101,8 +101,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), vertexClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         IFileSplitProvider fileSplitProvider = ClusterConfig.getFileSplitProvider(jobId, PRIMARY_INDEX);
 
         ITypeTraits[] typeTraits = new ITypeTraits[2];
@@ -138,7 +137,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor localSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, localSort);
 
         /**
@@ -241,8 +240,8 @@
          * connect the group-by operator
          */
         spec.connect(new OneToOneConnectorDescriptor(spec), localSort, 0, localGby, 0);
-        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories),
-                localGby, 0, globalGby, 0);
+        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories,
+                nkmFactory), localGby, 0, globalGby, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), globalGby, 0, materialize, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), materialize, 0, postSuperStep, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), postSuperStep, 0, emptySink2, 0);
@@ -258,7 +257,6 @@
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateNonFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -274,8 +272,7 @@
         RecordDescriptor rdUnnestedMessage = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), messageValueClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         RecordDescriptor rdFinal = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
                 MsgList.class.getName());
         RecordDescriptor rdInsert = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
@@ -338,7 +335,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor localSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, localSort);
 
         /**
@@ -440,8 +437,8 @@
         spec.connect(new OneToOneConnectorDescriptor(spec), deleteOp, 0, emptySink4, 0);
 
         spec.connect(new OneToOneConnectorDescriptor(spec), localSort, 0, localGby, 0);
-        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories),
-                localGby, 0, globalGby, 0);
+        spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, partionFactory, keyFields, sortCmpFactories,
+                nkmFactory), localGby, 0, globalGby, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), globalGby, 0, materialize, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), materialize, 0, postSuperStep, 0);
         spec.connect(new OneToOneConnectorDescriptor(spec), postSuperStep, 0, emptySink, 0);
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSingleSort.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSingleSort.java
index 3b3c9e7..718a271 100644
--- a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSingleSort.java
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSingleSort.java
@@ -31,6 +31,7 @@
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.file.IFileSplitProvider;
+import edu.uci.ics.hyracks.dataflow.std.sort.Algorithm;
 import edu.uci.ics.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexInsertUpdateDeleteOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallbackFactory;
@@ -41,7 +42,7 @@
 import edu.uci.ics.pregelix.core.data.TypeTraits;
 import edu.uci.ics.pregelix.core.hadoop.config.ConfigurationFactory;
 import edu.uci.ics.pregelix.core.jobgen.clusterconfig.ClusterConfig;
-import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory;
 import edu.uci.ics.pregelix.core.util.DataflowUtils;
 import edu.uci.ics.pregelix.dataflow.ConnectorPolicyAssignmentPolicy;
 import edu.uci.ics.pregelix.dataflow.EmptySinkOperatorDescriptor;
@@ -73,7 +74,6 @@
         super(job);
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -100,8 +100,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), vertexClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         IFileSplitProvider fileSplitProvider = ClusterConfig.getFileSplitProvider(jobId, PRIMARY_INDEX);
 
         ITypeTraits[] typeTraits = new ITypeTraits[2];
@@ -140,7 +139,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor globalSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, globalSort);
 
         /**
@@ -247,7 +246,6 @@
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateNonFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -263,8 +261,7 @@
         RecordDescriptor rdUnnestedMessage = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), messageValueClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         RecordDescriptor rdFinal = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
                 MsgList.class.getName());
         RecordDescriptor rdInsert = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
@@ -327,7 +324,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor globalSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, globalSort);
 
         /**
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSort.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSort.java
index e334095..75635c9 100644
--- a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSort.java
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenOuterJoinSort.java
@@ -31,6 +31,7 @@
 import edu.uci.ics.hyracks.dataflow.std.connectors.MToNPartitioningConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.file.IFileSplitProvider;
+import edu.uci.ics.hyracks.dataflow.std.sort.Algorithm;
 import edu.uci.ics.hyracks.dataflow.std.sort.ExternalSortOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexInsertUpdateDeleteOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallbackFactory;
@@ -41,7 +42,7 @@
 import edu.uci.ics.pregelix.core.data.TypeTraits;
 import edu.uci.ics.pregelix.core.hadoop.config.ConfigurationFactory;
 import edu.uci.ics.pregelix.core.jobgen.clusterconfig.ClusterConfig;
-import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory;
 import edu.uci.ics.pregelix.core.util.DataflowUtils;
 import edu.uci.ics.pregelix.dataflow.ConnectorPolicyAssignmentPolicy;
 import edu.uci.ics.pregelix.dataflow.EmptySinkOperatorDescriptor;
@@ -73,7 +74,6 @@
         super(job);
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -100,8 +100,7 @@
         RecordDescriptor recordDescriptor = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), vertexClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         IFileSplitProvider fileSplitProvider = ClusterConfig.getFileSplitProvider(jobId, PRIMARY_INDEX);
 
         ITypeTraits[] typeTraits = new ITypeTraits[2];
@@ -137,7 +136,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor localSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, localSort);
 
         /**
@@ -153,7 +152,7 @@
          * construct global sort operator
          */
         ExternalSortOperatorDescriptor globalSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, globalSort);
 
         /**
@@ -261,7 +260,6 @@
         return spec;
     }
 
-    @SuppressWarnings({ "rawtypes", "unchecked" })
     @Override
     protected JobSpecification generateNonFirstIteration(int iteration) throws HyracksException {
         Class<? extends WritableComparable<?>> vertexIdClass = BspUtils.getVertexIndexClass(conf);
@@ -277,8 +275,7 @@
         RecordDescriptor rdUnnestedMessage = DataflowUtils.getRecordDescriptorFromKeyValueClasses(
                 vertexIdClass.getName(), messageValueClass.getName());
         IBinaryComparatorFactory[] comparatorFactories = new IBinaryComparatorFactory[1];
-        comparatorFactories[0] = new WritableComparingBinaryComparatorFactory(WritableComparator.get(vertexIdClass)
-                .getClass());
+        comparatorFactories[0] = RawBinaryComparatorFactory.INSTANCE;
         RecordDescriptor rdFinal = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
                 MsgList.class.getName());
         RecordDescriptor rdInsert = DataflowUtils.getRecordDescriptorFromKeyValueClasses(vertexIdClass.getName(),
@@ -341,7 +338,7 @@
         sortCmpFactories[0] = JobGenUtil.getIBinaryComparatorFactory(iteration, WritableComparator.get(vertexIdClass)
                 .getClass());
         ExternalSortOperatorDescriptor localSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, localSort);
 
         /**
@@ -357,7 +354,7 @@
          * construct global sort operator
          */
         ExternalSortOperatorDescriptor globalSort = new ExternalSortOperatorDescriptor(spec, maxFrameNumber, keyFields,
-                nkmFactory, sortCmpFactories, rdUnnestedMessage);
+                nkmFactory, sortCmpFactories, rdUnnestedMessage, Algorithm.QUICK_SORT);
         ClusterConfig.setLocationConstraint(spec, globalSort);
 
         /**
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenUtil.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenUtil.java
index c4f54fe..97cea99 100644
--- a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenUtil.java
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/jobgen/JobGenUtil.java
@@ -21,10 +21,12 @@
 import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 import edu.uci.ics.pregelix.api.graph.NormalizedKeyComputer;
 import edu.uci.ics.pregelix.api.util.BspUtils;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawBinaryComparatorFactory;
+import edu.uci.ics.pregelix.core.runtime.touchpoint.RawNormalizedKeyComputerFactory;
 import edu.uci.ics.pregelix.core.runtime.touchpoint.WritableComparingBinaryComparatorFactory;
 import edu.uci.ics.pregelix.runtime.touchpoint.VertexIdNormalizedKeyComputerFactory;
 
-@SuppressWarnings({ "rawtypes", "unchecked" })
+@SuppressWarnings({ "rawtypes" })
 public class JobGenUtil {
 
     /**
@@ -36,11 +38,7 @@
      * @return
      */
     public static INormalizedKeyComputerFactory getINormalizedKeyComputerFactory(Configuration conf) {
-        Class<? extends NormalizedKeyComputer> clazz = BspUtils.getNormalizedKeyComputerClass(conf);
-        if (clazz.equals(NormalizedKeyComputer.class)) {
-            return null;
-        }
-        return new VertexIdNormalizedKeyComputerFactory(clazz);
+        return RawNormalizedKeyComputerFactory.INSTANCE;
     }
 
     /**
@@ -52,6 +50,33 @@
      * @return
      */
     public static IBinaryComparatorFactory getIBinaryComparatorFactory(int iteration, Class keyClass) {
+        return RawBinaryComparatorFactory.INSTANCE;
+    }
+
+    /**
+     * get normalized key factory for the final output job
+     * 
+     * @param iteration
+     * @param keyClass
+     * @return
+     */
+    public static INormalizedKeyComputerFactory getFinalNormalizedKeyComputerFactory(Configuration conf) {
+        Class<? extends NormalizedKeyComputer> clazz = BspUtils.getNormalizedKeyComputerClass(conf);
+        if (clazz.equals(NormalizedKeyComputer.class)) {
+            return null;
+        }
+        return new VertexIdNormalizedKeyComputerFactory(clazz);
+    }
+
+    /**
+     * get comparator for the final output job
+     * 
+     * @param iteration
+     * @param keyClass
+     * @return
+     */
+    @SuppressWarnings("unchecked")
+    public static IBinaryComparatorFactory getFinalBinaryComparatorFactory(Class keyClass) {
         return new WritableComparingBinaryComparatorFactory(keyClass);
     }
 
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/runtime/touchpoint/RawBinaryComparatorFactory.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/runtime/touchpoint/RawBinaryComparatorFactory.java
new file mode 100644
index 0000000..c0173ed
--- /dev/null
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/runtime/touchpoint/RawBinaryComparatorFactory.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.core.runtime.touchpoint;
+
+import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparator;
+import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+
+public class RawBinaryComparatorFactory implements IBinaryComparatorFactory {
+
+    private static final long serialVersionUID = 1L;
+    public static IBinaryComparatorFactory INSTANCE = new RawBinaryComparatorFactory();
+
+    private RawBinaryComparatorFactory() {
+    }
+
+    @Override
+    public IBinaryComparator createBinaryComparator() {
+        return new IBinaryComparator() {
+
+            @Override
+            public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) {
+                int commonLength = Math.min(l1, l2);
+                for (int i = 0; i < commonLength; i++) {
+                    if (b1[s1 + i] != b2[s2 + i]) {
+                        return (b1[s1 + i] & 0xff) - (b2[s2 + i] & 0xff);
+                    }
+                }
+                int difference = l1 - l2;
+                return difference == 0 ? 0 : (difference > 0 ? 1 : -1);
+            }
+
+        };
+    }
+}
diff --git a/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/runtime/touchpoint/RawNormalizedKeyComputerFactory.java b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/runtime/touchpoint/RawNormalizedKeyComputerFactory.java
new file mode 100644
index 0000000..6aa4af9
--- /dev/null
+++ b/pregelix-core/src/main/java/edu/uci/ics/pregelix/core/runtime/touchpoint/RawNormalizedKeyComputerFactory.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package edu.uci.ics.pregelix.core.runtime.touchpoint;
+
+import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputer;
+import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
+
+public class RawNormalizedKeyComputerFactory implements INormalizedKeyComputerFactory {
+    private static final long serialVersionUID = 1L;
+    public static final INormalizedKeyComputerFactory INSTANCE = new RawNormalizedKeyComputerFactory();
+
+    private RawNormalizedKeyComputerFactory() {
+
+    }
+
+    @Override
+    public INormalizedKeyComputer createNormalizedKeyComputer() {
+        return new INormalizedKeyComputer() {
+
+            @Override
+            public int normalize(byte[] bytes, int start, int length) {
+                int nk = 0;
+                for (int i = 0; i < 4; i++) {
+                    nk <<= 8;
+                    if (i < length) {
+                        nk += (bytes[start + i] & 0xff);
+                    }
+                }
+                return nk;
+            }
+
+        };
+    }
+}
diff --git a/pregelix-core/src/test/java/edu/uci/ics/pregelix/core/join/JoinTest.java b/pregelix-core/src/test/java/edu/uci/ics/pregelix/core/join/JoinTest.java
index 4c7f91d..f599996 100644
--- a/pregelix-core/src/test/java/edu/uci/ics/pregelix/core/join/JoinTest.java
+++ b/pregelix-core/src/test/java/edu/uci/ics/pregelix/core/join/JoinTest.java
@@ -24,6 +24,7 @@
 import edu.uci.ics.hyracks.api.dataflow.IConnectorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryHashFunctionFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.INormalizedKeyComputerFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.INullWriterFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
@@ -34,6 +35,7 @@
 import edu.uci.ics.hyracks.data.std.accessors.PointableBinaryHashFunctionFactory;
 import edu.uci.ics.hyracks.data.std.primitive.UTF8StringPointable;
 import edu.uci.ics.hyracks.dataflow.common.data.marshalling.UTF8StringSerializerDeserializer;
+import edu.uci.ics.hyracks.dataflow.common.data.normalizers.UTF8StringNormalizedKeyComputerFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.parsers.IValueParserFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.parsers.UTF8StringParserFactory;
 import edu.uci.ics.hyracks.dataflow.common.data.partition.FieldHashPartitionComputerFactory;
@@ -89,6 +91,7 @@
             UTF8StringPointable.FACTORY);
     private IBinaryComparatorFactory stringComparatorFactory = new PointableBinaryComparatorFactory(
             UTF8StringPointable.FACTORY);
+    private INormalizedKeyComputerFactory nmkFactory = new UTF8StringNormalizedKeyComputerFactory();
 
     private void cleanupStores() throws IOException {
         FileUtils.forceMkdir(new File("teststore"));
@@ -211,7 +214,8 @@
         spec.connect(new OneToOneConnectorDescriptor(spec), join, 0, sorter, 0);
         IConnectorDescriptor joinWriterConn = new MToNPartitioningMergingConnectorDescriptor(spec,
                 new FieldHashPartitionComputerFactory(new int[] { 1 },
-                        new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories);
+                        new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories,
+                nmkFactory);
         spec.connect(joinWriterConn, sorter, 0, writer, 0);
 
         spec.addRoot(writer);
@@ -284,8 +288,8 @@
 
         spec.connect(new OneToOneConnectorDescriptor(spec), custScanner, 0, sorter, 0);
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, new FieldHashPartitionComputerFactory(
-                sortFields, new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories),
-                sorter, 0, writer, 0);
+                sortFields, new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories,
+                nmkFactory), sorter, 0, writer, 0);
 
         spec.addRoot(writer);
         runTest(spec);
@@ -368,11 +372,11 @@
 
         spec.connect(new OneToOneConnectorDescriptor(spec), ordScanner, 0, sorter, 0);
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, new FieldHashPartitionComputerFactory(
-                keyFields, new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories),
-                sorter, 0, join, 0);
+                keyFields, new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories,
+                nmkFactory), sorter, 0, join, 0);
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, new FieldHashPartitionComputerFactory(
-                keyFields, new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories),
-                join, 0, writer, 0);
+                keyFields, new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories,
+                nmkFactory), join, 0, writer, 0);
 
         spec.addRoot(writer);
         runTest(spec);
@@ -477,7 +481,8 @@
         spec.connect(new OneToOneConnectorDescriptor(spec), project, 0, sorter, 0);
         IConnectorDescriptor joinWriterConn = new MToNPartitioningMergingConnectorDescriptor(spec,
                 new FieldHashPartitionComputerFactory(new int[] { 9 },
-                        new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories);
+                        new IBinaryHashFunctionFactory[] { stringHashFactory }), sortFields, comparatorFactories,
+                nmkFactory);
         spec.connect(joinWriterConn, sorter, 0, writer, 0);
 
         spec.addRoot(writer);
@@ -573,7 +578,8 @@
         spec.connect(new OneToOneConnectorDescriptor(spec), ordScanner, 0, sorter, 0);
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, new FieldHashPartitionComputerFactory(
                 keyFields, new IBinaryHashFunctionFactory[] { new PointableBinaryHashFunctionFactory(
-                        UTF8StringPointable.FACTORY) }), sortFields, comparatorFactories), sorter, 0, join, 0);
+                        UTF8StringPointable.FACTORY) }), sortFields, comparatorFactories, nmkFactory), sorter, 0, join,
+                0);
 
         IBinaryComparatorFactory[] mergeComparatorFactories = new IBinaryComparatorFactory[2];
         mergeComparatorFactories[0] = new PointableBinaryComparatorFactory(UTF8StringPointable.FACTORY);
@@ -581,7 +587,8 @@
         int[] mergeFields = new int[] { 9, 0 };
         spec.connect(new MToNPartitioningMergingConnectorDescriptor(spec, new FieldHashPartitionComputerFactory(
                 new int[] { 9 }, new IBinaryHashFunctionFactory[] { new PointableBinaryHashFunctionFactory(
-                        UTF8StringPointable.FACTORY) }), mergeFields, comparatorFactories), join, 0, writer, 0);
+                        UTF8StringPointable.FACTORY) }), mergeFields, comparatorFactories, nmkFactory), join, 0,
+                writer, 0);
 
         spec.addRoot(writer);
         runTest(spec);
diff --git a/pregelix-example/data/update/webmap_link.txt b/pregelix-example/data/update/webmap_link.txt
new file mode 100644
index 0000000..9812045
--- /dev/null
+++ b/pregelix-example/data/update/webmap_link.txt
@@ -0,0 +1,10000 @@
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diff --git a/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ReachabilityVertex.java b/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ReachabilityVertex.java
index 1bb33b8..fa16ce5 100644
--- a/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ReachabilityVertex.java
+++ b/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ReachabilityVertex.java
@@ -87,6 +87,7 @@
 
     private ByteWritable tmpVertexValue = new ByteWritable();
     private long sourceId = -1;
+    private long destId = -1;
 
     /** The source vertex id */
     public static final String SOURCE_ID = "ReachibilityVertex.sourceId";
@@ -112,7 +113,7 @@
      * @return True if the source id
      */
     private boolean isDest(VLongWritable v) {
-        return (v.get() == getContext().getConfiguration().getLong(DEST_ID, DEST_ID_DEFAULT));
+        return (v.get() == destId);
     }
 
     @Override
@@ -120,6 +121,9 @@
         if (sourceId < 0) {
             sourceId = getContext().getConfiguration().getLong(SOURCE_ID, SOURCE_ID_DEFAULT);
         }
+        if (destId < 0) {
+            destId = getContext().getConfiguration().getLong(DEST_ID, DEST_ID_DEFAULT);
+        }
         if (getSuperstep() == 1) {
             boolean isSource = isSource(getVertexId());
             if (isSource) {
diff --git a/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ShortestPathsVertex.java b/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ShortestPathsVertex.java
index 648f168..2fea813 100644
--- a/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ShortestPathsVertex.java
+++ b/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/ShortestPathsVertex.java
@@ -16,8 +16,6 @@
 package edu.uci.ics.pregelix.example;
 
 import java.util.Iterator;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 
 import org.apache.hadoop.io.FloatWritable;
 
@@ -84,12 +82,12 @@
 
     private DoubleWritable outputValue = new DoubleWritable();
     private DoubleWritable tmpVertexValue = new DoubleWritable();
-    /** Class logger */
-    private static final Logger LOG = Logger.getLogger(ShortestPathsVertex.class.getName());
     /** The shortest paths id */
     public static final String SOURCE_ID = "SimpleShortestPathsVertex.sourceId";
     /** Default shortest paths id */
     public static final long SOURCE_ID_DEFAULT = 1;
+    /** the source vertex id */
+    private long sourceId = -1;
 
     /**
      * Is this vertex the source id?
@@ -97,11 +95,14 @@
      * @return True if the source id
      */
     private boolean isSource() {
-        return (getVertexId().get() == getContext().getConfiguration().getLong(SOURCE_ID, SOURCE_ID_DEFAULT));
+        return (getVertexId().get() == sourceId);
     }
 
     @Override
     public void compute(Iterator<DoubleWritable> msgIterator) {
+        if (sourceId < 0) {
+            sourceId = getContext().getConfiguration().getLong(SOURCE_ID, SOURCE_ID_DEFAULT);
+        }
         if (getSuperstep() == 1) {
             tmpVertexValue.set(Double.MAX_VALUE);
             setVertexValue(tmpVertexValue);
@@ -110,17 +111,10 @@
         while (msgIterator.hasNext()) {
             minDist = Math.min(minDist, msgIterator.next().get());
         }
-        if (LOG.getLevel() == Level.FINE) {
-            LOG.fine("Vertex " + getVertexId() + " got minDist = " + minDist + " vertex value = " + getVertexValue());
-        }
         if (minDist < getVertexValue().get()) {
             tmpVertexValue.set(minDist);
             setVertexValue(tmpVertexValue);
             for (Edge<VLongWritable, FloatWritable> edge : getEdges()) {
-                if (LOG.getLevel() == Level.FINE) {
-                    LOG.fine("Vertex " + getVertexId() + " sent to " + edge.getDestVertexId() + " = "
-                            + (minDist + edge.getEdgeValue().get()));
-                }
                 outputValue.set(minDist + edge.getEdgeValue().get());
                 sendMsg(edge.getDestVertexId(), outputValue);
             }
diff --git a/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/inputformat/TextShortestPathsInputFormat.java b/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/inputformat/TextShortestPathsInputFormat.java
index 3ea4a9f..8987393 100644
--- a/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/inputformat/TextShortestPathsInputFormat.java
+++ b/pregelix-example/src/main/java/edu/uci/ics/pregelix/example/inputformat/TextShortestPathsInputFormat.java
@@ -73,6 +73,7 @@
 
         vertex.getMsgList().clear();
         vertex.getEdges().clear();
+        vertex.reset();
         Text line = getRecordReader().getCurrentValue();
         String[] fields = line.toString().split(separator);
 
diff --git a/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertex.java b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertex.java
new file mode 100644
index 0000000..9629b5b
--- /dev/null
+++ b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertex.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.example;
+
+import java.util.Iterator;
+
+import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.Text;
+
+import edu.uci.ics.pregelix.api.graph.Vertex;
+import edu.uci.ics.pregelix.example.io.VLongWritable;
+
+/**
+ * @author yingyib
+ */
+public class UpdateVertex extends Vertex<VLongWritable, Text, FloatWritable, VLongWritable> {
+
+    @Override
+    public void compute(Iterator<VLongWritable> msgIterator) throws Exception {
+        if (getSuperstep() < 14) {
+            Text value = getVertexValue();
+            String newValue = value.toString() + value.toString();
+            value.set(newValue);
+            activate();
+        } else if (getSuperstep() >= 14 && getSuperstep() < 28) {
+            Text value = getVertexValue();
+            String valueStr = value.toString();
+            char[] valueChars = valueStr.toCharArray();
+            if (valueChars.length <= 1) {
+                throw new IllegalStateException("illegal value length: " + valueChars.length);
+            }
+            char[] newValueChars = new char[valueChars.length / 2];
+            for (int i = 0; i < newValueChars.length; i++) {
+                newValueChars[i] = valueChars[i];
+            }
+            value.set(new String(newValueChars));
+            activate();
+        } else {
+            voteToHalt();
+        }
+    }
+}
diff --git a/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexInputFormat.java b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexInputFormat.java
new file mode 100644
index 0000000..e28c9e2
--- /dev/null
+++ b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexInputFormat.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.example;
+
+import java.io.IOException;
+
+import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.LongWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.InputSplit;
+import org.apache.hadoop.mapreduce.RecordReader;
+import org.apache.hadoop.mapreduce.TaskAttemptContext;
+
+import edu.uci.ics.pregelix.api.graph.Vertex;
+import edu.uci.ics.pregelix.api.io.VertexReader;
+import edu.uci.ics.pregelix.api.io.text.TextVertexInputFormat;
+import edu.uci.ics.pregelix.api.io.text.TextVertexInputFormat.TextVertexReader;
+import edu.uci.ics.pregelix.api.util.BspUtils;
+import edu.uci.ics.pregelix.example.io.DoubleWritable;
+import edu.uci.ics.pregelix.example.io.VLongWritable;
+
+public class UpdateVertexInputFormat extends TextVertexInputFormat<VLongWritable, Text, FloatWritable, DoubleWritable> {
+
+    @Override
+    public VertexReader<VLongWritable, Text, FloatWritable, DoubleWritable> createVertexReader(InputSplit split,
+            TaskAttemptContext context) throws IOException {
+        return new UpdateVertexReader(textInputFormat.createRecordReader(split, context), context);
+    }
+}
+
+@SuppressWarnings("rawtypes")
+class UpdateVertexReader extends TextVertexReader<VLongWritable, Text, FloatWritable, DoubleWritable> {
+
+    private final static String separator = " ";
+    private Vertex vertex;
+    private VLongWritable vertexId = new VLongWritable();
+
+    public UpdateVertexReader(RecordReader<LongWritable, Text> lineRecordReader, TaskAttemptContext context) {
+        super(lineRecordReader);
+    }
+
+    @Override
+    public boolean nextVertex() throws IOException, InterruptedException {
+        return getRecordReader().nextKeyValue();
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Vertex<VLongWritable, Text, FloatWritable, DoubleWritable> getCurrentVertex() throws IOException,
+            InterruptedException {
+        if (vertex == null)
+            vertex = (Vertex) BspUtils.createVertex(getContext().getConfiguration());
+        vertex.getMsgList().clear();
+        vertex.getEdges().clear();
+
+        vertex.reset();
+        Text line = getRecordReader().getCurrentValue();
+        String[] fields = line.toString().split(separator);
+
+        if (fields.length > 0) {
+            /**
+             * set the src vertex id
+             */
+            long src = Long.parseLong(fields[0]);
+            vertexId.set(src);
+            vertex.setVertexId(vertexId);
+
+            /**
+             * set the vertex value
+             */
+            vertex.setVertexValue(new Text("aaa"));
+        }
+        return vertex;
+    }
+}
\ No newline at end of file
diff --git a/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexOutputFormat.java b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexOutputFormat.java
new file mode 100644
index 0000000..5c16302
--- /dev/null
+++ b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexOutputFormat.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.example;
+
+import java.io.IOException;
+
+import org.apache.hadoop.io.FloatWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.RecordWriter;
+import org.apache.hadoop.mapreduce.TaskAttemptContext;
+
+import edu.uci.ics.pregelix.api.graph.Vertex;
+import edu.uci.ics.pregelix.api.io.VertexWriter;
+import edu.uci.ics.pregelix.api.io.text.TextVertexOutputFormat;
+import edu.uci.ics.pregelix.example.io.VLongWritable;
+
+public class UpdateVertexOutputFormat extends TextVertexOutputFormat<VLongWritable, Text, FloatWritable> {
+
+    @Override
+    public VertexWriter<VLongWritable, Text, FloatWritable> createVertexWriter(TaskAttemptContext context)
+            throws IOException, InterruptedException {
+        final RecordWriter<Text, Text> recordWriter = textOutputFormat.getRecordWriter(context);
+        return new UpdateVertexWriter(recordWriter);
+    }
+
+    /**
+     * Simple VertexWriter that support
+     */
+    public static class UpdateVertexWriter extends TextVertexWriter<VLongWritable, Text, FloatWritable> {
+        public UpdateVertexWriter(RecordWriter<Text, Text> lineRecordWriter) {
+            super(lineRecordWriter);
+        }
+
+        @Override
+        public void writeVertex(Vertex<VLongWritable, Text, FloatWritable, ?> vertex) throws IOException,
+                InterruptedException {
+            int len = vertex.getVertexValue().toString().toCharArray().length;
+            if (len != 1) {
+                throw new IllegalStateException("invalid value length: " + len);
+            }
+            getRecordWriter().write(new Text(vertex.getVertexId().toString()), new Text(Integer.toString(len)));
+        }
+    }
+
+}
diff --git a/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexTest.java b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexTest.java
new file mode 100644
index 0000000..fe5f2d1
--- /dev/null
+++ b/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexTest.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2009-2013 by The Regents of the University of California
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * you may obtain a copy of the License from
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package edu.uci.ics.pregelix.example;
+
+import junit.framework.Assert;
+
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
+import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
+import org.junit.Test;
+
+import edu.uci.ics.pregelix.api.job.PregelixJob;
+import edu.uci.ics.pregelix.core.driver.Driver;
+import edu.uci.ics.pregelix.core.util.PregelixHyracksIntegrationUtil;
+import edu.uci.ics.pregelix.example.util.TestCluster;
+
+/**
+ * This test case tests the error message propagation.
+ * 
+ * @author yingyib
+ */
+public class UpdateVertexTest {
+
+    private static String INPUT_PATH = "data/update";
+    private static String OUTPUT_PATH = "actual/resultcomplex";
+
+    @Test
+    public void test() throws Exception {
+        TestCluster testCluster = new TestCluster();
+        try {
+            PregelixJob job = new PregelixJob(UpdateVertex.class.getSimpleName());
+            job.setVertexClass(UpdateVertex.class);
+            job.setVertexInputFormatClass(UpdateVertexInputFormat.class);
+            job.setVertexOutputFormatClass(UpdateVertexOutputFormat.class);
+            job.setDynamicVertexValueSize(true);
+
+            FileInputFormat.setInputPaths(job, INPUT_PATH);
+            FileOutputFormat.setOutputPath(job, new Path(OUTPUT_PATH));
+            job.getConfiguration().setLong(PregelixJob.NUM_VERTICE, 23);
+
+            Driver driver = new Driver(UpdateVertex.class);
+            testCluster.setUp();
+            driver.runJob(job, "127.0.0.1", PregelixHyracksIntegrationUtil.TEST_HYRACKS_CC_CLIENT_PORT);
+        } catch (Exception e) {
+            Assert.assertTrue(e.toString().contains("This job is going to fail"));
+        } finally {
+            testCluster.tearDown();
+        }
+    }
+
+}