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From Vasiliy Baranov <Vasiliy.Bara...@Sun.COM>
Subject Task allocation to TaskTrackers
Date Wed, 14 Feb 2007 14:17:37 GMT
Hi,

I have a question regarding task allocation to TaskTrackers (could not 
find an answer in the docs). When a MapReduce job is run, does the 
system attempt to schedule a Map task on a machine that contains a 
replica of the task's input data, or not? If yes, how does the system 
know which TaskTracker corresponds to which DataNode (by IP  address, by 
host name, or by something else)? Also, what happens if that fails?

Thank you,
Vasiliy

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