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Posted to hdfs-dev@hadoop.apache.org by "Anu Engineer (JIRA)" <ji...@apache.org> on 2015/08/10 23:18:52 UTC

[jira] [Created] (HDFS-8883) NameNode Metrics : Add FSNameSystem lock Queue Length

Anu Engineer created HDFS-8883:
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             Summary: 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
            Priority: Minor
             Fix For: 2.8.0


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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