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Hadoop, mail # user - hybrid map/reducer scheduler?

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Re: hybrid map/reducer scheduler?
Hemanth Yamijala 2010-06-29, 04:15

> In addition to default FIFO scheduler, there are fair scheduler and capacity scheduler. In some sense, fair scheduler can be considered a user-based scheduling while capacity scheduler does a queue-based scheduling. Is there or will there be a hybrid scheduler that combines the good parts of the two (or a capacity scheduler that allows preemption, then different users are asked to submit jobs to different queues, in this way implicitly follow user-based scheduling as well, more or less)?

What user specific features are looking on top of capacity scheduler ?
Please note that the capacity scheduler already supports some user
specific concepts like limits per user per queue.