Reduce the number of progress calls in the merge code
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Key: HADOOP-3352
URL: https://issues.apache.org/jira/browse/HADOOP-3352
Project: Hadoop Core
Issue Type: Bug
Components: mapred
Reporter: Devaraj Das
Assignee: Devaraj Das
Fix For: 0.18.0
The number of Progressable.progress calls in the merge code should be reduced.
Specifically, MergeQueue.lessThan has a progress call that accounts for ~8% of
the CPU of a running reducer.
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