> Regarding number of map tasks 500+, 490 of them processing nothing, do you 
> have an explanation
> for that?..Wondering if its kicking off too many JVMs most doing nothing..

This would mean that throughout your regions, only a few have data in
the timestamp range you're looking for.

>
> 'top' reports less free memory (couple of gig.) though box has 36 gig total.. 
> I don't quite trust
> top since cached blocks don't show up under free column even if no process is 
> running..
>

You only have 1 machine?

BTW how much RAM did you give to HBase?

J-D

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