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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-974) FileSystem.Statistics should include NN accesses from the clients
Date Fri, 12 Feb 2010 20:02:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-974?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833140#action_12833140
] 

Arun C Murthy commented on HDFS-974:
------------------------------------

We've seen instances of wild, very large, jobs putting the NameNode under significant pressure
with a lot of unnecessary calls e.g. lisStatus from each map etc. These counters will aid
diagnostics significantly.

> FileSystem.Statistics should include NN accesses from the clients
> -----------------------------------------------------------------
>
>                 Key: HDFS-974
>                 URL: https://issues.apache.org/jira/browse/HDFS-974
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs client
>            Reporter: Arun C Murthy
>            Assignee: Sanjay Radia
>             Fix For: 0.22.0
>
>
> It is a very useful metric to track, we can track per-task and hence per-job stats through
Counters etc.

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