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https://issues.apache.org/jira/browse/HDFS-4052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13810504#comment-13810504
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Colin Patrick McCabe commented on HDFS-4052:
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Let's backport this to 2.2. It's a simple patch and will improve performance
> BlockManager#invalidateWork should print logs outside the lock
> --------------------------------------------------------------
>
> Key: HDFS-4052
> URL: https://issues.apache.org/jira/browse/HDFS-4052
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Priority: Minor
> Fix For: 3.0.0
>
> Attachments: HDFS-4052.b1.001.patch, HDFS-4052.trunk.001.patch
>
>
> Info level log information printed holding the lock is long and is printed by
> traversing a list/array. It would be better to move it outside of the lock.
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