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https://issues.apache.org/jira/browse/HDFS-10872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Erik Krogen updated HDFS-10872:
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Attachment: HDFS-10872.005.patch
Now that HADOOP-13782 has provided us with a metrics class which provides fast
concurrent access to {{MutableRate}} metrics ({{MutableRatesWithAggregation}}),
the patch has been refactored to make use of this. This required a minor
modification to {{MetricsRegistry}} to export a
{{newMutableRatesWithAggregation}} method to create a new metrics object in
{{FSNamesystem}} to be able to pass into {{FSNamesystemLock}}. This is
necessary since we want the lock hold metrics to be emitted within the
{{FSNamesystem}} metrics registry but they are generated within
{{FSNamesystemLock}}, so we pass the metric object down into the lock for
modification.
Attaching v005 patch.
> Add MutableRate metrics for FSNamesystemLock operations
> -------------------------------------------------------
>
> Key: HDFS-10872
> URL: https://issues.apache.org/jira/browse/HDFS-10872
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Erik Krogen
> Assignee: Erik Krogen
> Attachments: FSLockPerf.java, HDFS-10872.000.patch,
> HDFS-10872.001.patch, HDFS-10872.002.patch, HDFS-10872.003.patch,
> HDFS-10872.004.patch, HDFS-10872.005.patch
>
>
> Add metrics for FSNamesystemLock operations to see, overall, how long each
> operation is holding the lock for. Use MutableRate metrics for now.
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