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From: Bharath Ravi <bharathravi1@gmail.com>
Date: Mon, 25 Mar 2013 15:30:02 -0400
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Subject: Are there applications that directly use HBase's cache?
To: dev@hbase.apache.org
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Hi HBase-dev,

I'm working on improving caching in HBase as a part of academic research.
I was wondering if you could help me answer some "how HBase is used"
questions.

1.Are there instances of real-time applications that rely on HBase's
datanode caching directly? I realize that many real-time applications
employ a caching layer (like memcached) in between their stores and
front-ends. Are there cases where HBase is used directly without an
intermediate caching layer?

2. If so, why is an intermediate caching layer not employed?

Note: by "real-time", I mean workloads that require immediate responses to
a user: say a web application or real-time analytics (unlike MapReduce jobs
that may be long running over several hours).

Any advice would be greatly appreciated!

Thanks,
--
Bharath Ravi

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