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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1488) Add framework counters to track NN accesses
Date Fri, 12 Feb 2010 20:02:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1488?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12833139#action_12833139
] 

Arun C Murthy commented on MAPREDUCE-1488:
------------------------------------------

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.

> Add framework counters to track NN accesses
> -------------------------------------------
>
>                 Key: MAPREDUCE-1488
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1488
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>             Fix For: 0.22.0
>
>
> Shoot-off from HDFS-974.

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