Disk io of shuffle phase may decrease if shuffled data not decompressed
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Key: MAPREDUCE-1891
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1891
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: tasktracker
Reporter: Xiao Kang
Current shuffled data is decompressed immediately. It may use much less memory
for shuffle buffer if the data is not decompressed until merging to disk.
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