[jira] [Created] (HDFS-10941) Improve BlockManager#processMisReplicatesAsync log

["Xiaoyu Yao (JIRA)" <ji...@apache.org>]

Xiaoyu Yao created HDFS-10941:
---------------------------------

             Summary: Improve BlockManager#processMisReplicatesAsync log
                 Key: HDFS-10941
                 URL: https://issues.apache.org/jira/browse/HDFS-10941
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


BlockManager#processMisReplicatesAsync is the daemon thread running inside namenode to handle miserplicated blocks. As shown below, it has a trace log for each of the block in the cluster being processed (10000 blocks per iteration after sleep 10s). 
{code}
  MisReplicationResult res = processMisReplicatedBlock(block);
  if (LOG.isTraceEnabled()) {
    LOG.trace("block " + block + ": " + res);
  }
{code}
However, it is not very useful as dumping every block in the cluster will overwhelm the namenode log without much useful information assuming the majority of the blocks are not over/under replicated. This ticket is opened to improve the log for easy troubleshooting of block replication related issues by:
 
1) add debug log for blocks that get under/over replicated result during {{processMisReplicatedBlock()}} 

2) or change to trace log for only blocks that get non-OK result during {{processMisReplicatedBlock()}} 




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