multi-threaded merge phase
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Key: HADOOP-4730
URL: https://issues.apache.org/jira/browse/HADOOP-4730
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Affects Versions: 0.18.1
Reporter: Christian Kunz
Doing merges in multiple threads (when enough cores are available -- a
monitoring issue), the time spent in merging could be cut by a factor equal to
the number of threads.
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