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https://issues.apache.org/jira/browse/HDFS-14731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17303916#comment-17303916
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Jeffrey(Xilang) Yan commented on HDFS-14731:
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Is posibble to backport this PR to Hadoop 2？
> [FGL] Remove redundant locking on NameNode.
> -------------------------------------------
>
> Key: HDFS-14731
> URL: https://issues.apache.org/jira/browse/HDFS-14731
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Konstantin Shvachko
> Assignee: Konstantin Shvachko
> Priority: Major
> Fix For: 3.3.0, 3.1.4, 3.2.2
>
> Attachments: HDFS-14731.001.patch
>
>
> Currently NameNode has two global locks: FSNamesystemLock and
> FSDirectoryLock. An analysis shows that single FSNamesystemLock is sufficient
> to guarantee consistency of the NameNode state. FSDirectoryLock can be
> removed.
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