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From yglin <yglin.mlan...@gmail.com>
Subject HBase/Stargate dataflow in I/O perspective
Date Tue, 01 Apr 2014 07:18:46 GMT

I would like to know how data flows when you query it from HBase or
Stargate, especially in I/O perspective.
Please point me some directions to study.
That means questions like below:  
When is HFile(StoreFile) being loaded as a region into region server's
Does a region stay in region server's memory afterward? When is it being
When Stargate uses a scan instance to obtain data, does it communicate with
region server with another connection overhead?

Actually I'm asking these because I'm experimenting Toad for Cloud Database
on HBase.
And I got a performance issue of querying 400K data rows in about 5 minutes,
kind of a awkward number.
I installed HBase/HDFS on 7 VMs, 
1 ResourceManager, 1 as NameNode and HMaster, 5 as DataNodes and
Barely change any configuration for performance tuning.
I drew myself a very simple chart trying to find where are the bottlenecks.

I know I could miss many details in this simple chart
Please give me some clues
Much appreciate


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