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https://issues.apache.org/jira/browse/HDFS-4479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13583398#comment-13583398
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Suresh Srinivas commented on HDFS-4479:
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Jing, after the place where logSync is removed, there is a return. Should we do
logSync only once in possibly try finally?
> In branch-1, logSync() may be called with the FSNamesystem lock held in
> commitBlockSynchronization
> --------------------------------------------------------------------------------------------------
>
> Key: HDFS-4479
> URL: https://issues.apache.org/jira/browse/HDFS-4479
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 1.2.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Attachments: HDFS-4479.b1.001.patch
>
>
> In FSNamesystem#commitBlockSynchronization of branch-1, logSync() may be
> called when the FSNamesystem lock is held. Similar with HDFS-4186, this may
> cause some performance issue.
> Since logSync is called right after the synchronization section, we can
> simply remove the logSync call.
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