For each mapreduce, is shuffle and sort operation performed before or its happened after the completion of all mappers?
The mapreduce task happens in the following order
Shuffle can happen while mappers are generating data since it is only a data transfer. But the sort and reduce can only start once all the mappers are done.
Let me explain you the whole scenario
Reducer ...READ MORE
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org.apache.hadoop.mapred is the Old API
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put <localSrc> <dest>
copyF ...READ MORE
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