HDFS-8217. During block recovery for truncate Log new Block Id in case of copy-on-truncate is true. (Contributed by Vinayakumar B)

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -545,6 +545,9 @@ 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

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java

@@ -2840,7 +2840,9 @@ public class DataNode extends ReconfigurableBase
     
     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

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java

@@ -4229,6 +4229,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     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
@@ -4285,11 +4287,10 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
         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 "
@@ -4382,7 +4383,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     if (closeFile) {
       LOG.info("commitBlockSynchronization(oldBlock=" + oldBlock
           + ", file=" + src
-          + ", newgenerationstamp=" + newgenerationstamp
+          + (copyTruncate ? ", newBlock=" + truncatedBlock
+              : ", newgenerationstamp=" + newgenerationstamp)
           + ", newlength=" + newlength
           + ", newtargets=" + Arrays.asList(newtargets) + ") successful");
     } else {