HDFS-16914. Add some logs for updateBlockForPipeline RPC. (#5381)

Reviewed-by: Shilun Fan <slfan1989@apache.org>
Signed-off-by: Tao Li <tomscut@apache.org>

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/fsdataset/impl/FsDatasetImpl.java

@@ -1557,7 +1557,8 @@ class FsDatasetImpl implements FsDatasetSpi<FsVolumeImpl> {
   @Override // FsDatasetSpi
   public Replica recoverClose(ExtendedBlock b, long newGS,
       long expectedBlockLen) throws IOException {
-    LOG.info("Recover failed close " + b);
+    LOG.info("Recover failed close {}, new GS:{}, expectedBlockLen:{}",
+        b, newGS, expectedBlockLen);
     while (true) {
       try {
         try (AutoCloseableLock lock = lockManager.writeLock(LockLevel.VOLUME,

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

@@ -5939,6 +5939,8 @@ public class FSNamesystem implements Namesystem, FSNamesystemMBean,
     }
     // Ensure we record the new generation stamp
     getEditLog().logSync();
+    LOG.info("bumpBlockGenerationStamp({}, client={}) success",
+        locatedBlock.getBlock(), clientName);
     return locatedBlock;
   }