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HBase, mail # dev - True Block Cache Hit ratio's


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Re: True Block Cache Hit ratio's
ramkrishna vasudevan 2013-04-16, 16:34
>If not, my sense is that it would be pretty valuable to add one. Thoughts ?
Agree.

Regards
Ram

On Tue, Apr 16, 2013 at 10:00 PM, Varun Sharma <[EMAIL PROTECTED]> wrote:

> Hi,
>
> I am wondering whether the HBase cachingHitRatio metrics that the region
> server UI shows, can get me a break down by data blocks. I always see this
> number to be very high and that could be exagerated by the fact that each
> lookup hits the index blocks and bloom filter blocks in the block cache
> before retrieving the data block. This could be artificially bloating up
> the cache hit ratio.
>
> Assuming the above is correct, do we already have a cache hit ratio for
> data blocks alone which is more obscure ? If not, my sense is that it would
> be pretty valuable to add one. Thoughts ?
>
> Thanks
> Varun
>