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Posted to hdfs-issues@hadoop.apache.org by "Zhe Zhang (JIRA)" <ji...@apache.org> on 2016/08/25 17:16:20 UTC
[jira] [Commented] (HDFS-8883) NameNode Metrics : Add FSNameSystem
lock Queue Length
[ https://issues.apache.org/jira/browse/HDFS-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437259#comment-15437259 ]
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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