finish the debugging
diff --git a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/KmerListWritable.java b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/KmerListWritable.java
index 2aee32d..f7caebb 100644
--- a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/KmerListWritable.java
+++ b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/KmerListWritable.java
@@ -59,7 +59,7 @@
 
     public void append(KmerBytesWritable kmer) {
         setSize((1 + valueCount) * KmerBytesWritable.getBytesPerKmer() + HEADER_SIZE);
-        System.arraycopy(kmer.getBytes(), 0, storage,
+        System.arraycopy(kmer.getBytes(), kmer.offset, storage,
                 offset + HEADER_SIZE + valueCount * KmerBytesWritable.getBytesPerKmer(),
                 KmerBytesWritable.getBytesPerKmer());
         valueCount += 1;
@@ -96,7 +96,7 @@
         }
         valueCount = 0;
         setSize(newSize * KmerBytesWritable.getBytesPerKmer() + HEADER_SIZE);
-        for (KmerBytesWritable kmer : uniqueElements) {
+        for (KmerBytesWritable kmer : uniqueElements) { // this point is not efficient
             append(kmer);
         }
         Marshal.putInt(valueCount, storage, offset);
@@ -126,6 +126,7 @@
 
     public void reset() {
         valueCount = 0;
+        Marshal.putInt(valueCount, storage, offset);
     }
 
     public KmerBytesWritable getPosition(int i) {
diff --git a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/NodeWritable.java b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/NodeWritable.java
index 362c12e..15a6cc9 100644
--- a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/NodeWritable.java
+++ b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/NodeWritable.java
@@ -71,7 +71,6 @@
         this.kmer.reset(0);
     }
     
-    
     public PositionListWritable getNodeIdList() {
         return nodeIdList;
     }
diff --git a/genomix/genomix-data/src/test/java/edu/uci/ics/genomix/data/test/NodeWritableTest.java b/genomix/genomix-data/src/test/java/edu/uci/ics/genomix/data/test/NodeWritableTest.java
new file mode 100644
index 0000000..5bcf663
--- /dev/null
+++ b/genomix/genomix-data/src/test/java/edu/uci/ics/genomix/data/test/NodeWritableTest.java
@@ -0,0 +1,105 @@
+package edu.uci.ics.genomix.data.test;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.Random;
+
+import junit.framework.Assert;
+
+import org.junit.Test;
+
+import edu.uci.ics.genomix.type.KmerBytesWritable;
+import edu.uci.ics.genomix.type.KmerListWritable;
+import edu.uci.ics.genomix.type.NodeWritable;
+import edu.uci.ics.genomix.type.PositionListWritable;
+import edu.uci.ics.genomix.type.PositionWritable;
+
+public class NodeWritableTest {
+
+    @Test
+    public void testNodeReset() throws IOException {
+        
+        NodeWritable outputNode = new NodeWritable();
+        NodeWritable inputNode = new NodeWritable();
+        
+        KmerListWritable nextKmerList = new KmerListWritable();
+        KmerListWritable preKmerList = new KmerListWritable();
+        KmerBytesWritable preKmer = new KmerBytesWritable();
+        KmerBytesWritable curKmer = new KmerBytesWritable();
+        KmerBytesWritable nextKmer = new KmerBytesWritable();
+        PositionWritable nodeId = new PositionWritable();
+        PositionListWritable nodeIdList = new PositionListWritable();
+        KmerBytesWritable.setGlobalKmerLength(5);
+        
+        nodeId.set((byte)0, (long)1, 0);
+        nodeIdList.append(nodeId);
+        for (int i = 6; i <= 10; i++) {
+        NodeWritable tempNode = new NodeWritable();
+        
+        String randomString = generaterRandomString(i);
+        byte[] array = randomString.getBytes();
+        
+        curKmer.setByRead(array, 0);
+        preKmer.setAsCopy(curKmer);
+        nextKmer.setAsCopy(curKmer);
+        nextKmer.shiftKmerWithNextChar(array[5]);
+        
+        nextKmerList.append(nextKmer);
+        
+        outputNode.setNodeIdList(nodeIdList);
+        outputNode.setFFList(nextKmerList);
+        
+        tempNode.setNodeIdList(nodeIdList);
+        tempNode.setFFList(nextKmerList);
+        
+        inputNode.setAsReference(outputNode.marshalToByteArray(), 0);
+        Assert.assertEquals(tempNode.toString(), inputNode.toString());
+        
+        int j = 5;
+        for (; j < array.length - 1; j++) {
+            outputNode.reset();
+            curKmer.setAsCopy(nextKmer);
+            
+            nextKmer.shiftKmerWithNextChar(array[j+1]);
+            nextKmerList.reset();
+            nextKmerList.append(nextKmer);
+            preKmerList.reset();
+            preKmerList.append(preKmer);
+            outputNode.setNodeIdList(nodeIdList);
+            outputNode.setFFList(nextKmerList);
+            outputNode.setRRList(preKmerList);
+            tempNode.reset();
+            tempNode.setNodeIdList(nodeIdList);
+            tempNode.setFFList(nextKmerList);
+            tempNode.setRRList(preKmerList);
+            preKmer.setAsCopy(curKmer);
+            inputNode.reset();
+            inputNode.setAsReference(outputNode.marshalToByteArray(), 0);
+            Assert.assertEquals(tempNode.toString(), inputNode.toString());
+        }
+        curKmer.setAsCopy(nextKmer);
+        preKmerList.reset();
+        preKmerList.append(preKmer);
+        outputNode.reset();
+        outputNode.setNodeIdList(nodeIdList);
+        outputNode.setRRList(preKmerList);
+        tempNode.reset();
+        tempNode.setNodeIdList(nodeIdList);
+        tempNode.setRRList(preKmerList);
+        inputNode.reset();
+        inputNode.setAsReference(outputNode.marshalToByteArray(), 0);
+        Assert.assertEquals(tempNode.toString(), inputNode.toString());
+        }
+    }
+
+    public String generaterRandomString(int n) {
+        char[] chars = "ACGT".toCharArray();
+        StringBuilder sb = new StringBuilder();
+        Random random = new Random();
+        for (int i = 0; i < n; i++) {
+            char c = chars[random.nextInt(chars.length)];
+            sb.append(c);
+        }
+        return sb.toString();
+    }
+}
diff --git a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java
index 84f9fe0..fc5ca34 100644
--- a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java
+++ b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/ReadsKeyValueParserFactory.java
@@ -135,8 +135,8 @@
                 writeToFrame(writer);
 
                 /*middle kmer*/
-                int i = kmerSize;
-                for (; i < array.length - 1; i++) {
+                int i = kmerSize + 1;
+                for (; i < array.length; i++) {
                     outputNode.reset();
                     setPreKmerByOldCurKmer();
                     setCurKmerByOldNextKmer();
diff --git a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/aggregators/AggregateKmerAggregateFactory.java b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/aggregators/AggregateKmerAggregateFactory.java
index 46fdd0e..a484179 100644
--- a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/aggregators/AggregateKmerAggregateFactory.java
+++ b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/aggregators/AggregateKmerAggregateFactory.java
@@ -48,6 +48,7 @@
         return new IAggregatorDescriptor() {
             
             private NodeWritable readNode = new NodeWritable();
+//            private KmerBytesWritable readKeyKmer = new KmerBytesWritable();
             
             protected int getOffSet(IFrameTupleAccessor accessor, int tIndex, int fieldId) {
                 int tupleOffset = accessor.getTupleStartOffset(tIndex);
@@ -75,13 +76,14 @@
                     AggregateState state) throws HyracksDataException {
                 NodeWritable localUniNode = (NodeWritable) state.state;
                 localUniNode.reset();
+//                readKeyKmer.setAsReference(accessor.getBuffer().array(), getOffSet(accessor, tIndex, 0));
                 readNode.setAsReference(accessor.getBuffer().array(), getOffSet(accessor, tIndex, 1));
                 localUniNode.getNodeIdList().appendList(readNode.getNodeIdList());
                 localUniNode.getFFList().appendList(readNode.getFFList());
                 localUniNode.getFRList().appendList(readNode.getFRList());
                 localUniNode.getRFList().appendList(readNode.getRFList());
                 localUniNode.getRRList().appendList(readNode.getRRList());
-
+                
                 // make an empty field
                 tupleBuilder.addFieldEndOffset();// mark question?
             }
diff --git a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/assembleKeyIntoNodeOperator.java b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/assembleKeyIntoNodeOperator.java
new file mode 100644
index 0000000..36a1d1e
--- /dev/null
+++ b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/dataflow/assembleKeyIntoNodeOperator.java
@@ -0,0 +1,162 @@
+/*
+ * 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.genomix.hyracks.newgraph.dataflow;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import edu.uci.ics.genomix.type.KmerBytesWritable;
+import edu.uci.ics.genomix.type.NodeWritable;
+
+import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
+import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable;
+import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider;
+import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
+import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
+import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
+import edu.uci.ics.hyracks.api.job.IOperatorDescriptorRegistry;
+import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder;
+import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor;
+import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAppender;
+import edu.uci.ics.hyracks.dataflow.common.comm.util.FrameUtils;
+import edu.uci.ics.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor;
+import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryInputUnaryOutputOperatorNodePushable;
+
+public class assembleKeyIntoNodeOperator extends AbstractSingleActivityOperatorDescriptor {
+
+    public assembleKeyIntoNodeOperator(IOperatorDescriptorRegistry spec, RecordDescriptor outRecDesc, int kmerSize) {
+        super(spec, 1, 1);
+        recordDescriptors[0] = outRecDesc;
+        this.kmerSize = kmerSize;
+        KmerBytesWritable.setGlobalKmerLength(this.kmerSize);
+    }
+
+    private static final long serialVersionUID = 1L;
+    private final int kmerSize;
+
+    public static final int InputKmerField = 0;
+    public static final int InputtempNodeField = 1;
+    public static final int OutputNodeField = 0;
+
+    public static final RecordDescriptor nodeOutputRec = new RecordDescriptor(new ISerializerDeserializer[1]);
+
+    public class MapReadToNodePushable extends AbstractUnaryInputUnaryOutputOperatorNodePushable {
+        public static final int INT_LENGTH = 4;  
+        private final IHyracksTaskContext ctx;  
+        private final RecordDescriptor inputRecDesc; 
+        private final RecordDescriptor outputRecDesc; 
+
+        private FrameTupleAccessor accessor;
+        private ByteBuffer writeBuffer;
+        private ArrayTupleBuilder builder;
+        private FrameTupleAppender appender;
+        
+        NodeWritable readNode;
+        KmerBytesWritable readKmer;
+
+        public MapReadToNodePushable(IHyracksTaskContext ctx, RecordDescriptor inputRecDesc,
+                RecordDescriptor outputRecDesc) {
+            this.ctx = ctx;
+            this.inputRecDesc = inputRecDesc;
+            this.outputRecDesc = outputRecDesc;
+   
+            readNode = new NodeWritable();
+            readKmer = new KmerBytesWritable();            
+        }
+
+        @Override
+        public void open() throws HyracksDataException {
+            accessor = new FrameTupleAccessor(ctx.getFrameSize(), inputRecDesc);
+            writeBuffer = ctx.allocateFrame();
+            builder = new ArrayTupleBuilder(outputRecDesc.getFieldCount());
+            appender = new FrameTupleAppender(ctx.getFrameSize());
+            appender.reset(writeBuffer, true);
+            writer.open();
+        }
+
+        @Override
+        public void nextFrame(ByteBuffer buffer) throws HyracksDataException {
+            accessor.reset(buffer);
+            int tupleCount = accessor.getTupleCount();
+            for (int i = 0; i < tupleCount; i++) {
+                generateNodeFromKmer(i);
+            }
+        }
+
+        private void generateNodeFromKmer(int tIndex) throws HyracksDataException {
+            int offsetPoslist = accessor.getTupleStartOffset(tIndex) + accessor.getFieldSlotsLength();
+            
+            setKmer(readKmer, offsetPoslist + accessor.getFieldStartOffset(tIndex, InputKmerField));
+            readNode.reset();
+            setNode(readNode, offsetPoslist + accessor.getFieldStartOffset(tIndex, InputtempNodeField));
+
+            outputNode(readNode);
+        }
+
+
+        private void setKmer(KmerBytesWritable kmer, int offset) {
+            ByteBuffer buffer = accessor.getBuffer();
+            kmer.setAsCopy(buffer.array(), offset);
+        }
+
+        private void setNode(NodeWritable node, int offset) {
+            ByteBuffer buffer = accessor.getBuffer();
+            node.setAsCopy(buffer.array(), offset);
+        }
+
+
+        private void outputNode(NodeWritable node) throws HyracksDataException {
+
+            try {
+                builder.reset();
+                builder.addField(node.marshalToByteArray(), 0, node.getSerializedLength());
+
+                if (!appender.append(builder.getFieldEndOffsets(), builder.getByteArray(), 0, builder.getSize())) {
+                    FrameUtils.flushFrame(writeBuffer, writer);
+                    appender.reset(writeBuffer, true);
+                    if (!appender.append(builder.getFieldEndOffsets(), builder.getByteArray(), 0, builder.getSize())) {
+                        throw new IllegalStateException("Failed to append tuplebuilder to frame");
+                    }
+                }
+            } catch (IOException e) {
+                throw new IllegalStateException("Failed to Add a field to the tupleBuilder.");
+            }
+        }
+
+        @Override
+        public void fail() throws HyracksDataException {
+            writer.fail();
+        }
+
+        @Override
+        public void close() throws HyracksDataException {
+            if (appender.getTupleCount() > 0) {
+                FrameUtils.flushFrame(writeBuffer, writer);
+            }
+            writer.close();
+        }
+
+    }
+
+    @Override
+    public IOperatorNodePushable createPushRuntime(IHyracksTaskContext ctx,
+            IRecordDescriptorProvider recordDescProvider, int partition, int nPartitions) throws HyracksDataException {
+        return new MapReadToNodePushable(ctx, recordDescProvider.getInputRecordDescriptor(getActivityId(), 0),
+                recordDescriptors[0]);
+    }
+
+}
+
diff --git a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/io/NodeTextWriterFactory.java b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/io/NodeTextWriterFactory.java
index b7b7054..3836b13 100644
--- a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/io/NodeTextWriterFactory.java
+++ b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/io/NodeTextWriterFactory.java
@@ -17,7 +17,7 @@
 import java.io.DataOutput;
 import java.io.IOException;
 
-import edu.uci.ics.genomix.hyracks.newgraph.dataflow.ReadsKeyValueParserFactory;
+import edu.uci.ics.genomix.hyracks.newgraph.dataflow.assembleKeyIntoNodeOperator;
 import edu.uci.ics.genomix.type.NodeWritable;
 import edu.uci.ics.genomix.type.KmerBytesWritable;
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
@@ -33,8 +33,7 @@
      */
     private static final long serialVersionUID = 1L;
     private final int kmerSize;
-    public static final int OutputKmerField = ReadsKeyValueParserFactory.OutputKmerField;
-    public static final int outputNodeField = ReadsKeyValueParserFactory.OutputNodeField;
+    public static final int OutputNodeField = assembleKeyIntoNodeOperator.OutputNodeField;
     
     public NodeTextWriterFactory(int k) {
         this.kmerSize = k;
@@ -53,9 +52,7 @@
 
             @Override
             public void write(DataOutput output, ITupleReference tuple) throws HyracksDataException {
-                node.setAsReference(tuple.getFieldData(outputNodeField), tuple.getFieldStart(outputNodeField));
-                node.getKmer().reset(kmerSize);
-                node.getKmer().setAsReference(tuple.getFieldData(OutputKmerField), tuple.getFieldStart(OutputKmerField));
+                node.setAsReference(tuple.getFieldData(OutputNodeField), tuple.getFieldStart(OutputNodeField));
                 try {
                     output.write(node.toString().getBytes());
                     output.writeByte('\n');
diff --git a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/job/JobGenBrujinGraph.java b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/job/JobGenBrujinGraph.java
index afc1cf7..5b35eac 100644
--- a/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/job/JobGenBrujinGraph.java
+++ b/genomix/genomix-hyracks/src/main/java/edu/uci/ics/genomix/hyracks/newgraph/job/JobGenBrujinGraph.java
@@ -29,6 +29,7 @@
 import edu.uci.ics.genomix.hyracks.data.primitive.KmerPointable;
 import edu.uci.ics.genomix.hyracks.newgraph.dataflow.ConnectorPolicyAssignmentPolicy;
 import edu.uci.ics.genomix.hyracks.newgraph.dataflow.ReadsKeyValueParserFactory;
+import edu.uci.ics.genomix.hyracks.newgraph.dataflow.assembleKeyIntoNodeOperator;
 import edu.uci.ics.genomix.hyracks.newgraph.dataflow.aggregators.AggregateKmerAggregateFactory;
 import edu.uci.ics.genomix.hyracks.newgraph.dataflow.aggregators.MergeKmerAggregateFactory;
 import edu.uci.ics.genomix.hyracks.newgraph.io.NodeTextWriterFactory;
@@ -181,6 +182,16 @@
         return kmerCrossAggregator;
     }
 
+    public AbstractOperatorDescriptor generateKmerToFinalNode(JobSpecification jobSpec,
+            AbstractOperatorDescriptor kmerCrossAggregator) {
+
+        AbstractOperatorDescriptor mapToFinalNode = new assembleKeyIntoNodeOperator(jobSpec,
+                assembleKeyIntoNodeOperator.nodeOutputRec, kmerSize);
+        connectOperators(jobSpec, kmerCrossAggregator, ncNodeNames, mapToFinalNode, ncNodeNames,
+                new OneToOneConnectorDescriptor(jobSpec));
+        return mapToFinalNode;
+    }
+    
     public AbstractOperatorDescriptor generateNodeWriterOpertator(JobSpecification jobSpec,
             AbstractOperatorDescriptor mapEachReadToNode) throws HyracksException {
         ITupleWriterFactory nodeWriter = null;
@@ -209,10 +220,15 @@
         logDebug("Group by Kmer");
         AbstractOperatorDescriptor lastOperator = generateGroupbyKmerJob(jobSpec, readOperator);
 
+        logDebug("Generate final node");
+        lastOperator = generateKmerToFinalNode(jobSpec, lastOperator);
+
+        jobSpec.addRoot(lastOperator);
+        
         logDebug("Write node to result");
         lastOperator = generateNodeWriterOpertator(jobSpec, lastOperator);
 
-        jobSpec.addRoot(readOperator);//what's this? why we need this? why I can't seet it in the JobGenCheckReader
+        jobSpec.addRoot(lastOperator);
         return jobSpec;
     }
 
diff --git a/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/newgraph/test/JobRun.java b/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/newgraph/test/JobRun.java
index 25915aa..bf87b23 100644
--- a/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/newgraph/test/JobRun.java
+++ b/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/newgraph/test/JobRun.java
@@ -32,7 +32,7 @@
 @SuppressWarnings("deprecation")
 public class JobRun {
     private static final int KmerSize = 5;
-    private static final int ReadLength = 6;
+    private static final int ReadLength = 7;
     private static final String ACTUAL_RESULT_DIR = "actual";
     private static final String PATH_TO_HADOOP_CONF = "src/test/resources/hadoop/conf";
 
@@ -52,8 +52,8 @@
     
     @Test
     public void TestAll() throws Exception {
-        TestReader();
-//        TestGroupby();
+//        TestReader();
+        TestGroupby();
     }
     
     public void TestReader() throws Exception {
@@ -68,7 +68,7 @@
         cleanUpReEntry();
         conf.set(GenomixJobConf.GROUPBY_TYPE, GenomixJobConf.GROUPBY_TYPE_PRECLUSTER);
         driver.runJob(new GenomixJobConf(conf), Plan.BUILD_DEBRUJIN_GRAPH, true);
-//        dumpResult();
+        dumpResult();
     }
     
     @Before
diff --git a/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/test/JobRunStepByStepTest.java b/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/test/JobRunStepByStepTest.java
index 51a0d15..fbbc89a 100644
--- a/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/test/JobRunStepByStepTest.java
+++ b/genomix/genomix-hyracks/src/test/java/edu/uci/ics/genomix/hyracks/test/JobRunStepByStepTest.java
@@ -46,11 +46,11 @@
 @SuppressWarnings("deprecation")
 public class JobRunStepByStepTest {
     private static final int KmerSize = 5;
-    private static final int ReadLength = 8;
+    private static final int ReadLength = 7;
     private static final String ACTUAL_RESULT_DIR = "actual";
     private static final String PATH_TO_HADOOP_CONF = "src/test/resources/hadoop/conf";
 
-    private static final String DATA_INPUT_PATH = "src/test/resources/data/webmap/test1.txt";
+    private static final String DATA_INPUT_PATH = "src/test/resources/data/webmap/test.txt";
     private static final String HDFS_INPUT_PATH = "/webmap";
     private static final String HDFS_OUTPUT_PATH = "/webmap_result";
 
@@ -75,11 +75,11 @@
 
     @Test
     public void TestAll() throws Exception {
-//        TestReader();
+        TestReader();
 //        TestGroupbyKmer();
 //        TestMapKmerToRead();
 //        TestGroupByReadID();
-        TestEndToEnd();
+//        TestEndToEnd();
 //        TestUnMergedNode();
     }
 
diff --git a/genomix/genomix-hyracks/src/test/resources/data/webmap/SplitRepeat.txt b/genomix/genomix-hyracks/src/test/resources/data/webmap/SplitRepeat.txt
new file mode 100644
index 0000000..bb03d70
--- /dev/null
+++ b/genomix/genomix-hyracks/src/test/resources/data/webmap/SplitRepeat.txt
@@ -0,0 +1,2 @@
+1	AATAG
+2	CATAC
diff --git a/genomix/genomix-hyracks/src/test/resources/data/webmap/test1.txt b/genomix/genomix-hyracks/src/test/resources/data/webmap/test1.txt
index 3f1cd5c..a720dc4 100644
--- a/genomix/genomix-hyracks/src/test/resources/data/webmap/test1.txt
+++ b/genomix/genomix-hyracks/src/test/resources/data/webmap/test1.txt
@@ -1 +1 @@
-1	AATAGA
+1	AATAGAA
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/io/VertexValueWritable.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/io/VertexValueWritable.java
index 9cdac8f..e0b21bc 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/io/VertexValueWritable.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/io/VertexValueWritable.java
@@ -313,7 +313,7 @@
      */
     public void processMerges(byte neighborToDeleteDir, KmerBytesWritable nodeToDelete,
             byte neighborToMergeDir, KmerBytesWritable nodeToAdd, 
-            int kmerSize, KmerBytesWritable kmer){
+            int kmerSize, VKmerBytesWritable kmer){
         switch (neighborToDeleteDir & MessageFlag.DIR_MASK) {
             case MessageFlag.DIR_FF:
                 this.getFFList().remove(nodeToDelete); //set(null);
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/BasicGraphCleanVertex.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/BasicGraphCleanVertex.java
index 64965e3..fc0cd4b 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/BasicGraphCleanVertex.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/BasicGraphCleanVertex.java
@@ -95,7 +95,7 @@
     /**
      * get destination vertex
      */
-    public KmerBytesWritable getNextDestVertexIdAndSetFlag(VertexValueWritable value) {
+    public VKmerBytesWritable getNextDestVertexIdAndSetFlag(VertexValueWritable value) {
         if (value.getFFList().getCountOfPosition() > 0){ // #FFList() > 0
             posIterator = value.getFFList().iterator();
             outFlag &= MessageFlag.DIR_CLEAR;
@@ -112,7 +112,7 @@
         
     }
 
-    public KmerBytesWritable getPreDestVertexIdAndSetFlag(VertexValueWritable value) {
+    public VKmerBytesWritable getPreDestVertexIdAndSetFlag(VertexValueWritable value) {
         if (value.getRFList().getCountOfPosition() > 0){ // #RFList() > 0
             posIterator = value.getRFList().iterator();
             outFlag &= MessageFlag.DIR_CLEAR;
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/MapReduceVertex.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/MapReduceVertex.java
index ecd3c4f..186fa4c 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/MapReduceVertex.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/MapReduceVertex.java
@@ -51,7 +51,7 @@
             kmerList.reset();
         if(fakeVertex == null){
 //            fakeVertex = new KmerBytesWritable(kmerSize + 1); // TODO check if merge is correct
-            fakeVertex = new KmerBytesWritable();
+            fakeVertex = new VKmerBytesWritable();
             String random = generaterRandomString(kmerSize + 1);
             fakeVertex.setByRead(random.getBytes(), 0); 
         }
@@ -187,7 +187,7 @@
         job.setVertexInputFormatClass(GraphCleanInputFormat.class);
         job.setVertexOutputFormatClass(P2PathMergeOutputFormat.class);
         job.setDynamicVertexValueSize(true);
-        job.setOutputKeyClass(KmerBytesWritable.class);
+        job.setOutputKeyClass(VKmerBytesWritable.class);
         job.setOutputValueClass(VertexValueWritable.class);
         Client.run(args, job);
     }