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