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MapReduce >> mail # user >> Shuffle phase replication factor


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Re: Shuffle phase replication factor
The map output doesn't get written to HDFS. The map task writes its output to its local disk, the reduce tasks will pull the data through HTTP for further processing.

Am 21.05.2013 um 19:57 schrieb John Lilley <[EMAIL PROTECTED]>:

> When MapReduce enters “shuffle” to partition the tuples, I am assuming that it writes intermediate data to HDFS.  What replication factor is used for those temporary files?
> john
>  

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Kai Voigt
[EMAIL PROTECTED]