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From "Xiao Kang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1685) Debug statements affecting performance of JobTracker.heartbeat
Date Thu, 08 Apr 2010 09:48:36 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854879#action_12854879
] 

Xiao Kang commented on MAPREDUCE-1685:
--------------------------------------

Any more details? Which version of hadoop the 15% is profied on?

> Debug statements affecting performance of JobTracker.heartbeat
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-1685
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1685
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Vinod K V
>
> Several debug statements that come in the critical section in JobTracker.heartbeat()
are not protected by a LOG.isDebugEnabled() and so incur non-trivial costs, in the order of
15% of the total heartbeat processing time.

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