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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10475) Adding metrics for long FSNamesystem read and write locks
Date Wed, 14 Sep 2016 00:04:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15488887#comment-15488887
] 

Zhe Zhang commented on HDFS-10475:
----------------------------------

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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