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From jmozah <jmo...@gmail.com>
Subject Re: is it possible to view the number of hfiles a GET touches in hbase?
Date Fri, 10 Aug 2012 16:24:19 GMT
Hi Richard,

I am not so sure if there is any HBase metrics on this...!!!
But you can use the DataNode metrics like "blocksRead", "readBlockOp" etc to come to some
conclusion.


Ganglia may come in handy here..

./Zahoor


On 10-Aug-2012, at 4:47 PM, Richard Tang <tristartom.tech@gmail.com> wrote:

> Hi,
> Given a GET() operation, I want to monitor the number of on-disk hfiles it
> touches? GET() may need to
> check every in-memory hfiles (block index),  but don't need to touch every
> on-disk parts of hfiles. I want to know
> how many disk hfile a GET() accesses, that is, how many disk IO a GET() end
> up with...
> 
> is it possible to obtain this information without hack into hbase source
> code?
> Richard


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