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https://issues.apache.org/jira/browse/HADOOP-13702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15561477#comment-15561477
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Kai Zheng commented on HADOOP-13702:
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Thanks [~chris.douglas] for the comments. I just moved it to the common side.
> Add a new instrumented read-write lock
> --------------------------------------
>
> Key: HADOOP-13702
> URL: https://issues.apache.org/jira/browse/HADOOP-13702
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Reporter: Jingcheng Du
> Assignee: Jingcheng Du
> Attachments: HDFS-10924-2.patch, HDFS-10924-3.patch,
> HDFS-10924-4.patch, HDFS-10924.patch
>
>
> Add a new instrumented read-write lock in hadoop common, so that the
> HDFS-9668 can use this to improve the locking in FsDatasetImpl
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