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MapReduce >> mail # user >> Re: Hadoop schedulers!

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Re: Hadoop schedulers!
Any pointer to my question.

There is another question , kind-of dumb , but just wanted to clarify.

Say in a FIFO scheduler or a capacity scheduler , if there are slots
available and the first job doesn't need all of the available slots , then
the job next in the queue is scheduled for execution or that still waits
for the first job to finish?

On Sat, May 11, 2013 at 8:31 PM, Rahul Bhattacharjee <

> Hi,
> I was going through the job schedulers of Hadoop and could not see any
> major operational difference between the capacity scheduler and the fair
> share scheduler apart from the fact that fair share scheduler supports
> preemption and capacity scheduler doesn't.
> Another thing is the former creates logical pools based on certain
> attribute like username , user group etc and the later has a notion of job
> queues. Can someone point me to any other major differences between these
> two types of schedulers.
> Another question in this regard is the capacity scheduler uses a FIFO
> queue.So its still possible that a high priority long running job using all
> the capacity allocated to the queue to block all the other jobs after it in
> the queue.I think this is the expected behavior , but wanted to confirm.
> Thanks,
> Rahul