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From Ted Yu <yuzhih...@gmail.com>
Subject Re: HBase read operation document/help...
Date Tue, 25 Feb 2014 19:24:52 GMT
You may have read http://hbase.apache.org/book.html#perf.reading

For BlockCache, see this blog:


On Tue, Feb 25, 2014 at 11:03 AM, Upendra Yadav <upendra1024@gmail.com>wrote:

> I have go through no. of documents/slides about HBase read/get operation...
> But I have lot of broken links and question to clear view about how hbase
> read operation happen...
> Like....
> Client Communicate to zookeeper and get region server where -ROOT- table
> region reside...(And this is in memory)
> Then getting region server location for .META table region (And this is in
> memory)
> Then location of region server where region of user table reside by
> checking start and end rowkey with given GET operation rowkey...
> then will search 1st in memstore.... if found then return data
> else
> BlockCache.... if not then BloomFilter if negative then return not
> found.... else
> read from hfile....(how i don't know.. please help me)
> Bloomfilter and BlockCache update and return data...
> Is this correct... Please suggest me some good document...
> Still i have doubt ... how BlockCache LRU works...

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