HDFS-9434. Recommission a datanode with 500k blocks may pause NN for 30 seconds for printing info log messags.

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

@@ -23,6 +23,9 @@ Release 2.6.3 - UNRELEASED
     HDFS-9289. Make DataStreamer#block thread safe and verify genStamp in
     commitBlock. (Chang Li via zhz)
 
+    HDFS-9434. Recommission a datanode with 500k blocks may pause NN for 30
+    seconds for printing info log messags.  (szetszwo)
+
 Release 2.6.2 - 2015-10-28
 
   INCOMPATIBLE CHANGES

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManager.java

@@ -2853,11 +2853,11 @@ public class BlockManager {
     for(DatanodeStorageInfo storage : blocksMap.getStorages(block, State.NORMAL)) {
       final DatanodeDescriptor cur = storage.getDatanodeDescriptor();
       if (storage.areBlockContentsStale()) {
-        LOG.info("BLOCK* processOverReplicatedBlock: " +
-            "Postponing processing of over-replicated " +
-            block + " since storage + " + storage
-            + "datanode " + cur + " does not yet have up-to-date " +
-            "block information.");
+        if (LOG.isTraceEnabled()) {
+          LOG.trace("BLOCK* processOverReplicatedBlock: Postponing " + block
+              + " since storage " + storage
+              + " does not yet have up-to-date information.");
+        }
         postponeBlock(block);
         return;
       }