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MapReduce >> mail # user >> Relations ship between HDFS_BYTE_READ and Map input bytes


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Re: Relations ship between HDFS_BYTE_READ and Map input bytes

They can be different if maps read HDFS files directly instead of or on top of getting key-val pairs via the map interface.

HDFS_BYTES_READ will always be greater than or equal to map-input-bytes.

Thanks,
+Vinod

On Apr 29, 2013, at 1:50 AM, Pralabh Kumar wrote:

> Hi
>
> What's the relationship between HDFS_BYTE_READ and Map input bytes counter . Why can they be different for particular MR job.
>
> Thanks and Regards
> Pralabh Kumar
>