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