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https://issues.apache.org/jira/browse/HDFS-11615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erik Krogen updated HDFS-11615:
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Attachment: HDFS-11615.001.patch
Ah, thanks [~zhz], didn't realize there was precedent for this already. Sounds
good then! Uploading v001 patch which adds Nanos to the name and marks all of
the variables in the class with their unit.
> FSNamesystemLock metrics can be inaccurate due to millisecond precision
> -----------------------------------------------------------------------
>
> Key: HDFS-11615
> URL: https://issues.apache.org/jira/browse/HDFS-11615
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 2.7.4
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Attachments: HDFS-11615.000.patch, HDFS-11615.001.patch
>
>
> Currently the {{FSNamesystemLock}} metrics created in HDFS-10872 track the
> lock hold time using {{Timer.monotonicNow()}}, which has millisecond-level
> precision. However, many of these operations hold the lock for less than a
> millisecond, making these metrics inaccurate. We should instead use
> {{System.nanoTime()}} for higher accuracy.
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