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From madhu phatak <phatak....@gmail.com>
Subject Re: Cyclic dependency in JobControl job DAG
Date Tue, 26 Jun 2012 09:52:49 GMT
Hi,
 Opened a jira ticket ( https://issues.apache.org/jira/browse/MAPREDUCE-4371 )
and attached initial patch. Can anyone please review the patch and give
feedback?

On Mon, Jun 25, 2012 at 11:43 PM, Vinod Kumar Vavilapalli <
vinodkv@hortonworks.com> wrote:

>
> +1, can you please open a JIRA ticket (at
> https://issues.apache.org/jira/browse/MAPREDUCE) and attach a patch?
>
> Thanks,
> +Vinod
>
> On Jun 25, 2012, at 6:53 AM, Robert Evans wrote:
>
> > I personally think it is useful.  I would say contribute it.
> >
> > (Moved common-dev to bcc, we try not to cross post on these lists)
> >
> > --Bobby Evans
> >
> > On 6/25/12 3:37 AM, "madhu phatak" <phatak.dev@gmail.com> wrote:
> >
> > Hi,
> > In current implementation of JobControl, whenever there is a cyclic
> > dependency between the jobs it throws a Stack overflow exception .
> > For example,
> >   ControlledJob job1 = new ControlledJob(new Configuration());
> > job1.setJobName("job1");
> > ControlledJob job2 = new ControlledJob(new Configuration());
> > job2.setJobName("job2");
> > job1.addDependingJob(job2);
> > job2.addDependingJob(job1);
> >                JobControl jobControl = new JobControl("jobcontrol");
> > jobControl.addJob(job1);
> > jobControl.addJob(job2);
> > jobControl.run();
> >
> > throws
> >  java.lang.StackOverflowError
> > at java.util.ArrayList.get(ArrayList.java:322)
> > at
> >
> org.apache.hadoop.mapreduce.lib.jobcontrol.ControlledJob.checkState(ControlledJob.java:295)
> >
> > Whenever we write complex application, there is always possibility of
> > cyclic dependencies.I have written a method which checks for the cyclic
> > dependency  upfront and informs it to the user. I want to know from you
> > guys, do you think is it a useful feature? If yes I can contribute it as
> a
> > patch.
> >
> > Regards,
> > Madhukara Phatak
> > --
> > https://github.com/zinnia-phatak-dev/Nectar
> >
>
>


-- 
https://github.com/zinnia-phatak-dev/Nectar

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