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From elton sky <eltonsky9...@gmail.com>
Subject Why mergeParts() is not parallel with collect() on map?
Date Tue, 03 May 2011 06:30:11 GMT
In shuffle phase, reduce copies output from map. In parallel, there are
InMemoryMerger and OnDiskMerger merge copied files if too many. But on map,
the mergeParts*() *happens only after collect() finished. Why don't we
parallel spills merging with collect()/sort&spill on map?


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