-Re: Does a Map task run 3 times on 3 TTs or just once
Sai Sai 2013-04-12, 08:07
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.