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https://issues.apache.org/jira/browse/HDFS-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437259#comment-15437259
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Zhe Zhang commented on HDFS-8883:
---------------------------------
Thanks [~anu] for the work. This is a pretty good improvement. I just
backported to branch-2.7.
> 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: namenode
> Affects Versions: 2.7.1
> Reporter: Anu Engineer
> Assignee: Anu Engineer
> Fix For: 2.8.0, 2.7.4
>
> 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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