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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8883) NameNode Metrics : Add FSNameSystem lock Queue Length
Date Mon, 10 Aug 2015 22:07:45 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anu Engineer updated HDFS-8883:
-------------------------------
    Attachment: HDFS-8883.001.patch

* Adds a metric that exposes the FSNameSystemLock Contention
* Added tests to verify that lock contention will produce right metric
* Added tests to verify that JMX exposes these counters

> 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
>
>         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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