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MapReduce >> mail # user >> How MapReduce selects data blocks for processing user request


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How MapReduce selects data blocks for processing user request
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