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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4015) Need counters for spils and merges in mappers and reducers.
Date Wed, 27 Aug 2008 01:22:45 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12625937#action_12625937
] 

Runping Qi commented on HADOOP-4015:
------------------------------------

Also, it is desirable to log these counters periodically, because, the counters per task are
not available until the task complete.
However, it is helpful to know the progress of the spills/merges if they are huge.


> 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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