Erik Krogen commented on HDFS-10475:

After offline discussion with Zhe we have decided it would be best to lay this 
out with MutableRate metrics at first to get some initial idea of overall lock 
time consumed by different operations. Histograms would comprise a very large 
number of metrics (6+ metrics per operation for different quantiles and there 
are dozens of operations) and would be more work to implement. We have created 
subtasks for the initial MutableRate work and for discussing/adding histograms 
via HdrHistogram.

> 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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