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

@@ -1474,6 +1474,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9400. TestRollingUpgradeRollback fails on branch-2.
     (Brahma Reddy Battula via cnauroth)
 
+    HDFS-9434. Recommission a datanode with 500k blocks may pause NN for 30
+    seconds for printing info log messags.  (szetszwo)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -2926,11 +2926,9 @@ public class BlockManager implements BlockStatsMXBean {
     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.");
+        LOG.trace("BLOCK* processOverReplicatedBlock: Postponing {}"
+            + " since storage {} does not yet have up-to-date information.",
+            block, storage);
         postponeBlock(block);
         return;
       }