diff --git a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java
index 1ad6cf0..833462c 100644
--- a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java
+++ b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java
@@ -17,6 +17,7 @@
 import edu.uci.ics.genomix.type.NodeWritable;
 import edu.uci.ics.genomix.type.PositionListWritable;
 import edu.uci.ics.genomix.type.PositionWritable;
+import edu.uci.ics.genomix.type.VKmerBytesWritable;
 
 @SuppressWarnings("deprecation")
 public class GenomixMapper extends MapReduceBase implements
@@ -49,17 +50,18 @@
     @Override
     public void configure(JobConf job) {
         KMER_SIZE = Integer.parseInt(job.get("sizeKmer"));
-        preForwardKmer = new KmerBytesWritable(KMER_SIZE);
-        preReverseKmer = new KmerBytesWritable(KMER_SIZE);
-        curForwardKmer = new KmerBytesWritable(KMER_SIZE);
-        curReverseKmer = new KmerBytesWritable(KMER_SIZE);
-        nextForwardKmer = new KmerBytesWritable(KMER_SIZE);
-        nextReverseKmer = new KmerBytesWritable(KMER_SIZE);
+        KmerBytesWritable.setGlobalKmerLength(KMER_SIZE);
+        preForwardKmer = new KmerBytesWritable();
+        preReverseKmer = new KmerBytesWritable();
+        curForwardKmer = new KmerBytesWritable();
+        curReverseKmer = new KmerBytesWritable();
+        nextForwardKmer = new KmerBytesWritable();
+        nextReverseKmer = new KmerBytesWritable();
         nodeId = new PositionWritable();
         nodeIdList = new PositionListWritable();
-        edgeListForPreKmer = new KmerListWritable(KMER_SIZE);
-        edgeListForNextKmer = new KmerListWritable(KMER_SIZE);
-        outputNode = new NodeWritable(KMER_SIZE);
+        edgeListForPreKmer = new KmerListWritable();
+        edgeListForNextKmer = new KmerListWritable();
+        outputNode = new NodeWritable();
         preKmerDir = KmerDir.FORWARD;
         curKmerDir = KmerDir.FORWARD;
         nextKmerDir = KmerDir.FORWARD;
@@ -86,7 +88,7 @@
             }
             
             /** first kmer **/
-            outputNode.reset(KMER_SIZE);
+            outputNode.reset();
             curForwardKmer.setByRead(array, 0);
             curReverseKmer.setByReadReverse(array, 0);
             curKmerDir = curForwardKmer.compareTo(curReverseKmer) <= 0 ? KmerDir.FORWARD : KmerDir.REVERSE;
@@ -100,7 +102,7 @@
             
             /** middle kmer **/
             for (int i = KMER_SIZE + 1; i < array.length; i++) {
-                outputNode.reset(KMER_SIZE);
+                outputNode.reset();
             	setPreKmerByOldCurKmer();
             	setCurKmerByOldNextKmer();
             	setNextKmer(array[i]);
@@ -114,7 +116,7 @@
             }
             
             /** last kmer **/
-            outputNode.reset(KMER_SIZE);
+            outputNode.reset();
         	setPreKmerByOldCurKmer();
         	setCurKmerByOldNextKmer();
         	//set value.nodeId
@@ -138,12 +140,12 @@
     		case FORWARD:
     			switch(preKmerDir){
     				case FORWARD:
-    				    edgeListForPreKmer.reset(KMER_SIZE);
+    				    edgeListForPreKmer.reset();
     				    edgeListForPreKmer.append(preForwardKmer);
     					outputNode.setRRList(edgeListForPreKmer);
     					break;
     				case REVERSE:
-    				    edgeListForPreKmer.reset(KMER_SIZE);
+    				    edgeListForPreKmer.reset();
     				    edgeListForPreKmer.append(preReverseKmer);
     					outputNode.setRFList(edgeListForPreKmer);
     					break;
@@ -152,12 +154,12 @@
     		case REVERSE:
     			switch(preKmerDir){
     				case FORWARD:
-    				    edgeListForPreKmer.reset(KMER_SIZE);
+    				    edgeListForPreKmer.reset();
     				    edgeListForPreKmer.append(preForwardKmer);
     					outputNode.setFRList(edgeListForPreKmer);
     					break;
     				case REVERSE:
-    				    edgeListForPreKmer.reset(KMER_SIZE);
+    				    edgeListForPreKmer.reset();
     				    edgeListForPreKmer.append(preReverseKmer);
     					outputNode.setFFList(edgeListForPreKmer);
     					break;
@@ -171,12 +173,12 @@
     		case FORWARD:
     			switch(nextKmerDir){
     				case FORWARD:
-    					edgeListForNextKmer.reset(KMER_SIZE);
+    					edgeListForNextKmer.reset();
     					edgeListForNextKmer.append(nextForwardKmer);
     					outputNode.setFFList(edgeListForNextKmer);
     					break;
     				case REVERSE:
-    					edgeListForNextKmer.reset(KMER_SIZE);
+    					edgeListForNextKmer.reset();
     					edgeListForNextKmer.append(nextReverseKmer);
     					outputNode.setFRList(edgeListForNextKmer);
     					break;
@@ -185,12 +187,12 @@
     		case REVERSE:
     			switch(nextKmerDir){
     				case FORWARD:
-    					edgeListForNextKmer.reset(KMER_SIZE);
+    					edgeListForNextKmer.reset();
     					edgeListForNextKmer.append(nextForwardKmer);
     					outputNode.setRFList(edgeListForNextKmer);
     					break;
     				case REVERSE:
-    					edgeListForNextKmer.reset(KMER_SIZE);
+    					edgeListForNextKmer.reset();
     					edgeListForNextKmer.append(nextReverseKmer);
     					outputNode.setRRList(edgeListForNextKmer);
     					break;
diff --git a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java
index 1633c26..f39cdcb 100644
--- a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java
+++ b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java
@@ -23,15 +23,16 @@
     @Override
     public void configure(JobConf job) {
         KMER_SIZE = GenomixMapper.KMER_SIZE;
-        outputNode = new NodeWritable(KMER_SIZE);
-        tmpNode = new NodeWritable(KMER_SIZE);
+        KmerBytesWritable.setGlobalKmerLength(KMER_SIZE);
+        outputNode = new NodeWritable();
+        tmpNode = new NodeWritable();
     }
     
 	@Override
 	public void reduce(KmerBytesWritable key, Iterator<NodeWritable> values,
 			OutputCollector<KmerBytesWritable, NodeWritable> output,
 			Reporter reporter) throws IOException {
-		outputNode.reset(KMER_SIZE);
+		outputNode.reset();
 		
 		while (values.hasNext()) {
 		    tmpNode.set(values.next());
diff --git a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/graphclean/mergepaths/h3/MergePathsH3.java b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/graphclean/mergepaths/h3/MergePathsH3.java
index 8736fe3..b28328f 100644
--- a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/graphclean/mergepaths/h3/MergePathsH3.java
+++ b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/graphclean/mergepaths/h3/MergePathsH3.java
@@ -27,6 +27,7 @@
 import edu.uci.ics.genomix.hadoop.pmcommon.PathNodeInitial.PathNodeFlag;
 import edu.uci.ics.genomix.oldtype.NodeWritable;
 import edu.uci.ics.genomix.oldtype.PositionWritable;
+import edu.uci.ics.genomix.type.KmerBytesWritable;
 
 @SuppressWarnings("deprecation")
 public class MergePathsH3 extends Configured implements Tool {
@@ -58,12 +59,14 @@
         private boolean finalMerge;
 
         public void configure(JobConf conf) {
+            KMER_SIZE = conf.getInt("sizeKmer", 0);
+            KmerBytesWritable.setGlobalKmerLength(KMER_SIZE);
+            
             randSeed = conf.getLong("randomSeed", 0);
             randGenerator = new Random(randSeed);
             probBeingRandomHead = conf.getFloat("probBeingRandomHead", 0.5f);
             finalMerge = conf.getBoolean("finalMerge", false);
 
-            KMER_SIZE = conf.getInt("sizeKmer", 0);
             outputValue = new NodeWithFlagWritable(KMER_SIZE);
             outputKey = new PositionWritable();
             curNode = new NodeWritable(KMER_SIZE);
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/format/InitialGraphCleanInputFormat.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/format/InitialGraphCleanInputFormat.java
index 5c8f9c2..6695abe 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/format/InitialGraphCleanInputFormat.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/format/InitialGraphCleanInputFormat.java
@@ -70,7 +70,7 @@
              * set the vertex value
              */
             node.set(getRecordReader().getCurrentValue());
-            vertexValue.setKmerlength(node.getKmerlength());
+            vertexValue.setKmerlength(node.getKmerLength());
             vertexValue.setNodeIdList(node.getNodeIdList());
             vertexValue.setFFList(node.getFFList());
             vertexValue.setFRList(node.getFRList());