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From "Vinod K V (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-1685) Debug statements affecting performance of JobTracker.heartbeat
Date Fri, 09 Apr 2010 17:37:51 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod K V updated MAPREDUCE-1685:
---------------------------------

    Affects Version/s: 0.20.1

Most of these debug statements are in JobTracker/JobInProgress/CapacityTaskScheduler. It's
tested on 0.20 clusters.

> 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
>    Affects Versions: 0.20.1
>            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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