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https://issues.apache.org/jira/browse/HDFS-10941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoyu Yao updated HDFS-10941:
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Assignee: Chen Liang (was: Xiaoyu Yao)
> 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: Chen Liang
>
> 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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