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HBase >> mail # user >> What is in BlockCache?

yun peng 2013-05-20, 12:07
Anoop John 2013-05-20, 12:48
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Re: What is in BlockCache?
The reference guide has a pretty good section about this:

What do you think is missing in order to fully answer your question?



On Mon, May 20, 2013 at 5:07 AM, yun peng <[EMAIL PROTECTED]> wrote:
> Hi, All,
> I am wondering what is exactly stored in BlockCache: Is it the same raw
> blocks as in HFile? or does HBase merge several raw blocks and store the
> merged block in cache to serve future queries?
> To be more specific, when a get operation entails loading of block b1 from
> hfile f1, and of block b2 from hfile f2. In order to produce the final
> result, the overlapping part of two blocks are merged. So in BlockCache,
> does HBase store b1 and b2 separately, or store the merged form?
> Thanks,
> Yun