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How does speculative execution work in Hadoop?

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How does speculative execution work in Hadoop?
posted Dec 2, 2014 by Kali Mishra

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JobTracker makes different TaskTrackers pr2ocess same input. When tasks complete, they announce this fact to the JobTracker. Whichever copy of a task finishes first becomes the definitive copy. If other copies were executing speculatively, Hadoop tells the TaskTrackers to abandon the tasks and discard their outputs. The Reducers then receive their inputs from whichever Mapper completed successfully, first.

answer Dec 6, 2014 by Amit Kumar Pandey
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