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https://issues.apache.org/jira/browse/HDFS-2533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13142733#comment-13142733
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Eli Collins commented on HDFS-2533:
-----------------------------------
+1 new patch looks good.
> Remove needless synchronization on FSDataSet.getBlockFile
> ---------------------------------------------------------
>
> Key: HDFS-2533
> URL: https://issues.apache.org/jira/browse/HDFS-2533
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: data-node, performance
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Minor
> Attachments: hdfs-2533.txt, hdfs-2533.txt
>
>
> HDFS-1148 discusses lock contention issues in FSDataset. It provides a more
> comprehensive fix, converting it all to RWLocks, etc. This JIRA is for one
> very specific fix which gives a decent performance improvement for
> TestParallelRead: getBlockFile() currently holds the lock which is completely
> unnecessary.
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