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From Mehal Patel <mehal01...@gmail.com>
Subject How MapReduce selects data blocks for processing user request
Date Sat, 09 Feb 2013 00:40:58 GMT
Hello All,

I am confused over how MapReduce tasks select data blocks for processing
user requests ?

As data block replication replicates single data block over multiple
datanodes, during job processing how uniquely
data blocks are selected for processing user requests ? How does it
guarantees that no same block gets chosen twice or thrice
for different mapper task.


Thank you

-Mehal

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