diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index b3b0607af1a..913040f7693 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -227,6 +227,9 @@ Release 2.8.0 - UNRELEASED
 
     HDFS-7993. Provide each Replica details in fsck (J.Andreina via vinayakumarb)
 
+    HDFS-8217. During block recovery for truncate Log new Block Id in case of
+    copy-on-truncate is true. (vinayakumarb)
+
 Release 2.7.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
index a13a31f2b6d..ba02be24444 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
@@ -2847,7 +2847,9 @@ private static void logRecoverBlock(String who, RecoveringBlock rb) {
     
     LOG.info(who + " calls recoverBlock(" + block
         + ", targets=[" + Joiner.on(", ").join(targets) + "]"
-        + ", newGenerationStamp=" + rb.getNewGenerationStamp() + ")");
+        + ((rb.getNewBlock() == null) ? ", newGenerationStamp="
+            + rb.getNewGenerationStamp() : ", newBlock=" + rb.getNewBlock())
+        + ")");
   }
 
   @Override // ClientDataNodeProtocol
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
index 4249fecb4e1..f175301361b 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
@@ -4225,6 +4225,8 @@ void commitBlockSynchronization(ExtendedBlock oldBlock,
     String src = "";
     waitForLoadingFSImage();
     writeLock();
+    boolean copyTruncate = false;
+    BlockInfoContiguousUnderConstruction truncatedBlock = null;
     try {
       checkOperation(OperationCategory.WRITE);
       // If a DN tries to commit to the standby, the recovery will
@@ -4281,11 +4283,10 @@ void commitBlockSynchronization(ExtendedBlock oldBlock,
         return;
       }
 
-      BlockInfoContiguousUnderConstruction truncatedBlock =
-          (BlockInfoContiguousUnderConstruction) iFile.getLastBlock();
+      truncatedBlock = (BlockInfoContiguousUnderConstruction) iFile
+          .getLastBlock();
       long recoveryId = truncatedBlock.getBlockRecoveryId();
-      boolean copyTruncate =
-          truncatedBlock.getBlockId() != storedBlock.getBlockId();
+      copyTruncate = truncatedBlock.getBlockId() != storedBlock.getBlockId();
       if(recoveryId != newgenerationstamp) {
         throw new IOException("The recovery id " + newgenerationstamp
                               + " does not match current recovery id "
@@ -4378,7 +4379,8 @@ void commitBlockSynchronization(ExtendedBlock oldBlock,
     if (closeFile) {
       LOG.info("commitBlockSynchronization(oldBlock=" + oldBlock
           + ", file=" + src
-          + ", newgenerationstamp=" + newgenerationstamp
+          + (copyTruncate ? ", newBlock=" + truncatedBlock
+              : ", newgenerationstamp=" + newgenerationstamp)
           + ", newlength=" + newlength
           + ", newtargets=" + Arrays.asList(newtargets) + ") successful");
     } else {