add update test
diff --git a/pregelix/pregelix-example/data/update/webmap_link.txt b/pregelix/pregelix-example/data/update/webmap_link.txt
new file mode 100644
index 0000000..9812045
--- /dev/null
+++ b/pregelix/pregelix-example/data/update/webmap_link.txt
@@ -0,0 +1,10000 @@
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+9996
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diff --git a/pregelix/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertex.java b/pregelix/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertex.java
new file mode 100644
index 0000000..9629b5b
--- /dev/null
+++ b/pregelix/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/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexInputFormat.java b/pregelix/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexInputFormat.java
new file mode 100644
index 0000000..e28c9e2
--- /dev/null
+++ b/pregelix/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/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexOutputFormat.java b/pregelix/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexOutputFormat.java
new file mode 100644
index 0000000..5c16302
--- /dev/null
+++ b/pregelix/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/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexTest.java b/pregelix/pregelix-example/src/test/java/edu/uci/ics/pregelix/example/UpdateVertexTest.java
new file mode 100644
index 0000000..fe5f2d1
--- /dev/null
+++ b/pregelix/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();
+        }
+    }
+
+}