[HDFS-9839] Reduce verbosity of processReport logging

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.8.0
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 20/Feb/16 18:05
• Updated: 30/Aug/16 01:19
• Resolved: 21/Feb/16 07:24

Description

BlockManager#processReport logs one line for each invalidated block at INFO. HDFS-7503 moved this logging outside the NameSystem write lock but we still see the NameNode being slowed down when the number of block invalidations is very large e.g. just after a large amount of data is deleted.

      for (Block b : invalidatedBlocks) {
        blockLog.info("BLOCK* processReport: {} on node {} size {} does not " +
            "belong to any file", b, node, b.getNumBytes());
      }

We can change this statement to DEBUG and just log the number of block invalidations at INFO.