Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Threaded View
Hadoop >> mail # user >> Measuring Shuffle time for MR job

Copy link to this message
Re: Measuring Shuffle time for MR job
Shuffle time is considered as part of the reduce step. Without reduce,
there is no need for shuffling.
One way to measure it would be using the full reduce time with a
'/dev/null' reducer.

I am not aware of any way to measure it.



On Mon, Aug 27, 2012 at 8:18 AM, praveenesh kumar <[EMAIL PROTECTED]>wrote:

> Is there a way to know the total shuffle time of a map-reduce job - I mean
> some command or output  that can tell that ?
> I want to measure total map, total shuffle and total reduce time for my MR
> job -- how can I achieve it ? I am using hadoop 0.20.205
> Regards,
> Praveenesh

Bertrand Dechoux