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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Excessive .META scans
Date Mon, 29 Jul 2013 17:37:46 GMT
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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