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Hadoop, mail # user - speculative execution before mappers finish


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speculative execution before mappers finish
Jay Vyas 2012-10-13, 02:16
Is it possible for reducers to start (not just copying, but actually)
"reducing" before all mappers are done, speculatively?

In particular im asking this because Im curious about the internals of how
the shuffle and sort might (or might not :)) be able to support this.