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From "Xiaoyu Yao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8883) NameNode Metrics : Add FSNameSystem lock Queue Length
Date Sat, 15 Aug 2015 03:33:45 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14698089#comment-14698089
] 

Xiaoyu Yao commented on HDFS-8883:
----------------------------------

Thanks [~anu] for working on this. 
Patch LGTM. +1.

> NameNode Metrics : Add FSNameSystem lock Queue Length
> -----------------------------------------------------
>
>                 Key: HDFS-8883
>                 URL: https://issues.apache.org/jira/browse/HDFS-8883
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: HDFS
>    Affects Versions: 2.7.1
>            Reporter: Anu Engineer
>            Assignee: Anu Engineer
>             Fix For: 2.8.0
>
>         Attachments: HDFS-8883.001.patch
>
>
> FSNameSystemLock can have contention when NameNode is under load. This patch adds  LockQueueLength
-- the number of threads waiting on FSNameSystemLock -- as a metric in NameNode. 



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