Debug statements affecting performance of JobTracker.heartbeat
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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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