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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: optimizing block cache requests + eviction
Date Mon, 08 Jul 2013 23:37:07 GMT
Do you know if it's a data or meta block?


On Mon, Jul 8, 2013 at 4:28 PM, Viral Bajaria <viral.bajaria@gmail.com> wrote:
> I was able to reproduce the same regionserver asking for the same local
> block over 300 times within the same 2 minute window by running one of my
> heavy workloads.
> Let me try and gather some stack dumps. I agree that jstack crashing the
> jvm is concerning but there is nothing in the errors to know why it
> happened. I will keep that conversation out of here.
> As an addendum, I am using asynchbase as my client. Not sure if the arrival
> of multiple requests for rowkeys that could be in the same non-cached block
> causes hbase to queue up a non-cached block read via SCR and since the box
> is under load, it queues up multiple of these and makes the problem worse.
> Thanks,
> Viral
> On Mon, Jul 8, 2013 at 3:53 PM, Andrew Purtell <apurtell@apache.org> wrote:
>> but unless the behavior you see is the _same_ regionserver asking for the
>> _same_ block many times consecutively, it's probably workload related.

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