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https://issues.apache.org/jira/browse/HDFS-10742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15475060#comment-15475060
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Erik Krogen commented on HDFS-10742:
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For v16 patch IIUC you actually still have the default set at 2s (FsDatasetImpl
line 287)
> Measurement of lock held time in FsDatasetImpl
> ----------------------------------------------
>
> Key: HDFS-10742
> URL: https://issues.apache.org/jira/browse/HDFS-10742
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Affects Versions: 3.0.0-alpha2
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-10742.001.patch, HDFS-10742.002.patch,
> HDFS-10742.003.patch, HDFS-10742.004.patch, HDFS-10742.005.patch,
> HDFS-10742.006.patch, HDFS-10742.007.patch, HDFS-10742.008.patch,
> HDFS-10742.009.patch, HDFS-10742.010.patch, HDFS-10742.011.patch,
> HDFS-10742.012.patch, HDFS-10742.013.patch, HDFS-10742.014.patch,
> HDFS-10742.015.patch, HDFS-10742.016.patch
>
>
> This JIRA proposes to measure the time the of lock of {{FsDatasetImpl}} is
> held by a thread. Doing so will allow us to measure lock statistics.
> This can be done by extending the {{AutoCloseableLock}} lock object in
> {{FsDatasetImpl}}. In the future we can also consider replacing the lock with
> a read-write lock.
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