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https://issues.apache.org/jira/browse/HDFS-9839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15155858#comment-15155858
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Xiaoyu Yao commented on HDFS-9839:
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Patch LGTM. +1.
> Reduce verbosity of processReport logging
> -----------------------------------------
>
> Key: HDFS-9839
> URL: https://issues.apache.org/jira/browse/HDFS-9839
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.8.0
> Reporter: Arpit Agarwal
> Assignee: Arpit Agarwal
> Attachments: HDFS-9839.01.patch
>
>
> {{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.
> {code}
> for (Block b : invalidatedBlocks) {
> blockLog.info("BLOCK* processReport: {} on node {} size {} does not "
> +
> "belong to any file", b, node, b.getNumBytes());
> }
> {code}
> We can change this statement to DEBUG and just log the number of block
> invalidations at INFO.
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