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From Greg Roelofs <roel...@yahoo-inc.com>
Subject Re: Memory Manager in Hadoop MR
Date Fri, 10 Dec 2010 01:19:16 GMT
> 2 - How the JT knows that a Map or Reduce Task finished? Is through
> the heartbeat?

Exactly.  Tasks communicate with their TTs through the umbilical, and each
TT communicates with the JT via heartbeat (and heartbeat response).

Greg

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