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https://issues.apache.org/jira/browse/HDFS-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-10475:
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    Issue Type: New Feature  (was: Improvement)

> 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: New Feature
>          Components: namenode
>            Reporter: Xiaoyu Yao
>            Assignee: Erik Krogen
>              Labels: metrics
>
> 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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