HDFS-3803. Merging change 1373174 from trunk

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1373182 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -203,6 +203,9 @@ Release 2.0.1-alpha - UNRELEASED
     HDFS-3765. namenode -initializeSharedEdits should be able to initialize
     all shared storages. (Vinay and todd via todd)
 
+    HDFS-3803. Change BlockPoolSliceScanner chatty INFO log to DEBUG.
+    (Andrew Purtell via suresh)
+
   OPTIMIZATIONS
 
     HDFS-2982. Startup performance suffers when there are many edit log

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

@@ -554,9 +554,11 @@ class BlockPoolSliceScanner {
   }
   
   private synchronized void startNewPeriod() {
-    LOG.info("Starting a new period : work left in prev period : "
+    if (LOG.isDebugEnabled()) {
+      LOG.debug("Starting a new period : work left in prev period : "
         + String.format("%.2f%%", totalBytesToScan == 0 ? 0
             : (bytesLeft * 100.0) / totalBytesToScan));
+    }
 
     // reset the byte counts :
     bytesLeft = totalBytesToScan;