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From Nicolas Liochon <nkey...@gmail.com>
Subject Re: Excessive .META scans
Date Mon, 29 Jul 2013 17:43:01 GMT
It could be HBASE-6870?


On Mon, Jul 29, 2013 at 7:37 PM, Jean-Daniel Cryans <jdcryans@apache.org>wrote:

> Can you tell who's doing it? You could enable IPC debug for a few secs
> to see who's coming in with scans.
>
> You could also try to disable pre-fetching, set
> hbase.client.prefetch.limit to 0
>
> Also, is it even causing a problem or you're just worried it might
> since it doesn't look "normal"?
>
> J-D
>
> On Mon, Jul 29, 2013 at 10:32 AM, Varun Sharma <varun@pinterest.com>
> wrote:
> > Hi folks,
> >
> > We are seeing an issue with hbase 0.94.3 on CDH 4.2.0 with excessive
> .META.
> > reads...
> >
> > In the steady state where there are no client crashes and there are no
> > region server crashes/region movement, the server holding .META. is
> serving
> > an incredibly large # of read requests on the .META. table.
> >
> > From my understanding, in the steady state, region locations should be
> > indefinitely cached in the client. The client is running a work load of
> > multiput(s), puts, gets and coprocessor calls.
> >
> > Thanks
> > Varun
>

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