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From Robert Dyer <psyb...@gmail.com>
Subject Re: HBase Checksum
Date Fri, 01 Feb 2013 05:40:53 GMT
Not trying to hijack your thread here...

But can you verify via logs that the shortcircuit is working?  Because I
enabled shortcircuit but I sure didn't see any performance increase.

I haven't tried enabling hbase checksum yet but I'd like to be able to
verify that works too.


On Thu, Jan 31, 2013 at 9:55 PM, Anoop Sam John <anoopsj@huawei.com> wrote:

> You can check with HDFS level logs whether the checksum meta file is
> getting read to the DFS client? In the HBase handled checksum, this should
> not happen.
> Have you noticed any perf gain when you configure the HBase handled
> checksum option?
>
> -Anoop-
> ________________________________________
> From: Jean-Marc Spaggiari [jean-marc@spaggiari.org]
> Sent: Friday, February 01, 2013 4:16 AM
> To: user
> Subject: HBase Checksum
>
> Hi,
>
> I have activated shortcircuit and checksum and I would like to get a
> confirmation that it's working fine.
>
> So I have activated short circuit first and saw a 40% improvement of
> the MR rowcount job. So I guess it's working fine.
>
> Now, I'm configuring the checksum option, and I'm wondering how I can
> do to validate that it's taken into consideration and used, or not. Is
> there a way to see that?
>
> Thanks,
>
> JM
>

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