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How multiple reducer writing the output ? can multiple reducer write the output in single output file?

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1. How multiple reducers writing the output ? can multiple reducers write the output in a single output file?

Or we have to write an intermediate reducer to do so? i just want to know that how we can get a single output file from multiple reducers.

2. can map and reduce task run in the same container or more than one map task or reduce task can run in the same container?

if yes then how?

How container is assigning for map and reduce task?

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suppose if we want to run 1000 map task then we need 1000 container or we can run the map task less than 1000?

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