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https://issues.apache.org/jira/browse/HDFS-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15392583#comment-15392583
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Chen Liang commented on HDFS-10682:
-----------------------------------
removed an unnecessary instrumentation call.
> Add metric to measure lock held time in FSDataSetImpl
> -----------------------------------------------------
>
> Key: HDFS-10682
> URL: https://issues.apache.org/jira/browse/HDFS-10682
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-10682.001.patch, HDFS-10682.002.patch
>
>
> Add a metric to measure the time the lock of FSDataSetImpl is held by a
> thread. The goal is to expose this for users to identify operations that
> locks dataset for long time ("long" in some sense) and be able to
> understand/reason/track the operation based on logs.
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