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 f40795c..c6c1526 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
@@ -85,11 +85,11 @@
             VKmerBytesWritable kmer = new VKmerBytesWritable();
             kmerList = new VKmerListWritable();
             if(reverseKmer.compareTo(tmpKmer) > 0){
-                kmerDir.set(i, KmerDir.FORWARD);
+                kmerDir.add(KmerDir.FORWARD);
                 kmer.setAsCopy(tmpKmer);
             }
             else{
-                kmerDir.set(i, KmerDir.REVERSE);
+                kmerDir.add(KmerDir.REVERSE);
                 kmer.setAsCopy(reverseKmer);
             }
             if(!kmerMapper.containsKey(kmer)){
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/P1ForPathMergeVertex.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/P1ForPathMergeVertex.java
index 0adf5f6..a6e67c4 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/P1ForPathMergeVertex.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/operator/pathmerge/P1ForPathMergeVertex.java
@@ -37,6 +37,7 @@
             destVertexId = new VKmerBytesWritable();
         inFlag = 0;
         outFlag = 0;
+        headFlag = getHeadFlag();
         headMergeDir = getHeadMergeDir();
         if(repeatKmer == null)
             repeatKmer = new VKmerBytesWritable();
@@ -185,7 +186,8 @@
                         // NON-FAKE and Final vertice send msg to FAKE vertex 
                         sendMsgToFakeVertex();
                         voteToHalt();
-                    }
+                    } else
+                        activate();
                 }
             }
         } else
diff --git a/genomix/genomix-pregelix/src/test/java/edu/uci/ics/genomix/pregelix/JobRun/PathMergeTestSuite.java b/genomix/genomix-pregelix/src/test/java/edu/uci/ics/genomix/pregelix/JobRun/PathMergeTestSuite.java
index 1362dd7..ace0f79 100644
--- a/genomix/genomix-pregelix/src/test/java/edu/uci/ics/genomix/pregelix/JobRun/PathMergeTestSuite.java
+++ b/genomix/genomix-pregelix/src/test/java/edu/uci/ics/genomix/pregelix/JobRun/PathMergeTestSuite.java
@@ -6,7 +6,7 @@
 
     public static Test suite() throws Exception {
         String pattern ="PathMerge"; 
-        String testSet[] = {"3"
+        String testSet[] = {"4"
 //                "2", "3", "4", "5", "6", "7", "8", "9", "head_6", "head_7",
 //                "P2_3", "P2_4", "P2_5", "P2_6", "P2_7", "P2_8",
 //                "LeftAdj", "RightAdj",