HDFS-8659. Block scanner INFO message is spamming logs. Contributed by Yongjun Zhang.

(cherry picked from commit 43a1288fff5e323895fde66b9e3eb31a7412fcc2)

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

@@ -8,6 +8,8 @@ Release 2.7.2 - UNRELEASED
 
   IMPROVEMENTS
 
+  HDFS-8659. Block scanner INFO message is spamming logs. (Yongjun Zhang)
+
   OPTIMIZATIONS
 
   BUG FIXES

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

@@ -317,7 +317,7 @@ public class BlockScanner {
    */
   synchronized void markSuspectBlock(String storageId, ExtendedBlock block) {
     if (!isEnabled()) {
-      LOG.info("Not scanning suspicious block {} on {}, because the block " +
+      LOG.debug("Not scanning suspicious block {} on {}, because the block " +
           "scanner is disabled.", block, storageId);
       return;
     }

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

@@ -656,24 +656,24 @@ public class VolumeScanner extends Thread {
 
   public synchronized void markSuspectBlock(ExtendedBlock block) {
     if (stopping) {
-      LOG.info("{}: Not scheduling suspect block {} for " +
+      LOG.debug("{}: Not scheduling suspect block {} for " +
           "rescanning, because this volume scanner is stopping.", this, block);
       return;
     }
     Boolean recent = recentSuspectBlocks.getIfPresent(block);
     if (recent != null) {
-      LOG.info("{}: Not scheduling suspect block {} for " +
+      LOG.debug("{}: Not scheduling suspect block {} for " +
           "rescanning, because we rescanned it recently.", this, block);
       return;
     }
     if (suspectBlocks.contains(block)) {
-      LOG.info("{}: suspect block {} is already queued for " +
+      LOG.debug("{}: suspect block {} is already queued for " +
           "rescanning.", this, block);
       return;
     }
     suspectBlocks.add(block);
     recentSuspectBlocks.put(block, true);
-    LOG.info("{}: Scheduling suspect block {} for rescanning.", this, block);
+    LOG.debug("{}: Scheduling suspect block {} for rescanning.", this, block);
     notify(); // wake scanner thread.
   }