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Hadoop, mail # user - Multi-threaded map task


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Multi-threaded map task
Mark Olimpiati 2013-01-14, 05:57
Hi, this is a simple question, but why wasn't map or reduce tasks
programmed to be multi-threaded ? ie. instead of spawning 6 map tasks for 6
cores, run one map task with 6 parallel threads.

In fact I tried this myself, but turns that threading is not helping as it
would be in regular java programs for some reason .. any feedback on this
topic?

Thanks,
Mark