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From "Viraj Bhat (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4015) Need counters for spils and merges in mappers and reducers.
Date Mon, 25 Aug 2008 19:23:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625474#action_12625474
] 

Viraj Bhat commented on HADOOP-4015:
------------------------------------

+1 presently I have to analyze the job tracker logs and indirectly calculate these parameters
through Local Bytes Read,  Local Bytes Written, Map and Reduce Input Output bytes. 

> Need counters for spils and merges in mappers and reducers.
> -----------------------------------------------------------
>
>                 Key: HADOOP-4015
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4015
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Runping Qi
>
> Currently, it is hard to know whether a mapper did spills and how many if it did.
> It is even harder to figure out how many merges happened in a mapper or a reducer.
> Those data should be made available through counters.

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