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HDFS >> mail # user >> Re: Does a Map task run 3 times on 3 TTs or just once


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Re: Does a Map task run 3 times on 3 TTs or just once
Just wondering if it is right to assume that a Map task is run 3 times on 3 different TTs in parallel and whoever completes processing the task first that output is picked up and written to intermediate location.
Or is it true that a map task even though its data is replicated 3 times will run only once and other 2 will be on the stand by just incase this fails the second one will run followed by 3rd one if the 2nd Mapper fails.
Plesae pour some light.
Thanks
Sai