some reducer stuck at copy phase and progress extremely slowly
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Key: HADOOP-1984
URL: https://issues.apache.org/jira/browse/HADOOP-1984
Project: Hadoop
Issue Type: Bug
Components: mapred
Affects Versions: 0.14.0
Reporter: Runping Qi
Priority: Critical
In many cases, some reducers got stuck at copy phase, progressing extremely
slowly.
The entire cluster seems doing nothing. This causes a very bad long tails of
otherwise well tuned map/red jobs.
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