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From xeon Mailinglist <xeonmailingl...@gmail.com>
Subject Re: What is the class that launches the reducers?
Date Thu, 25 Aug 2016 23:10:02 GMT
But then I need to set identity maps to run the reducers. If I suspend a
job after the maps finish, I don't need to set identity maps up. I want to
suspend a job so that I don't run identity maps and get better performance.

On Aug 25, 2016 10:12 PM, "Haibo Chen" <haibochen@cloudera.com> wrote:

One thing you can try is to write a map-only job first and then verify the
map out.

On Thu, Aug 25, 2016 at 1:18 PM, xeon Mailinglist <xeonmailinglist@gmail.com
> wrote:

> I am using Mapreduce v2.
>
> On Aug 25, 2016 8:18 PM, "xeon Mailinglist" <xeonmailinglist@gmail.com>
> wrote:
>
> > I am trying to implement a mechanism in MapReduce v2 that allows to
> > suspend and resume a job. I must suspend a job when all the mappers
> finish,
> > and resume the job from that point after some time. I do this, because I
> > want to verify the integrity of the map output before executing the
> > reducers.
> >
> > I am looking for the class that tells when the Reduce tasks should start.
> > Does anyone know where is this?
> >
>

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