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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: What is in BlockCache?
Date Tue, 21 May 2013 18:55:51 GMT
The reference guide has a pretty good section about this:
http://hbase.apache.org/book.html#block.cache

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

Thx,

J-D

On Mon, May 20, 2013 at 5:07 AM, yun peng <pengyunmomo@gmail.com> 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

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