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https://issues.apache.org/jira/browse/HDFS-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15488887#comment-15488887
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Zhe Zhang commented on HDFS-10475:
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Thanks for the insight Andrew. Do we have per-OP RPC processing time metrics?
The simplest question we'd like to answer is something like, how much % of time
is fsn locked by {{listStatus}}. We couldn't find a way to assess this from
existing metrics. Any thoughts?
> Adding metrics for long FSNamesystem read and write locks
> ---------------------------------------------------------
>
> Key: HDFS-10475
> URL: https://issues.apache.org/jira/browse/HDFS-10475
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Xiaoyu Yao
> Assignee: Erik Krogen
>
> This is a follow up of the comment on HADOOP-12916 and
> [here|https://issues.apache.org/jira/browse/HDFS-9924?focusedCommentId=15310837&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15310837]
> add more metrics and WARN/DEBUG logs for long FSD/FSN locking operations on
> namenode similar to what we have for slow write/network WARN/metrics on
> datanode.
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