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From Michael Segel <michael_se...@hotmail.com>
Subject RE: HBase Transaction per second in Map-Reduce
Date Tue, 24 May 2011 19:18:28 GMT


Are we talking about an African or European Swallow?
(Sorry its a reference to the Monty Python movie scene where they cross the bridge after being
asked 3 questions which they must answer correctly? [What's the forward air speed velocity
of an unladen swallow?])

The point is that you're asking a question which has no valid answer because there are so
many variables that will effect the timings.

Just to list a couple of the things that will impact your performance:
1) Hardware
2) Network topology
3) Table schema.
4) Tuning of Hadoop environment
5) Caching? Oh wait, that could be considered Tuning.

So while I can understand that you want to improve your performance, you really have to get
down and look at a couple of larger issues.


PS. Whatever expectations you have, you'll need to lower them. ;-)
> Date: Tue, 24 May 2011 14:31:21 -0400
> Subject: HBase Transaction per second in Map-Reduce
> From: himanish@gmail.com
> To: user@hbase.apache.org
> Hi,
> Could anybody please point to some article or paper which can give an
> understanding of the transaction per second (both read and write) that is
> supported or seen to be accomplished using HBase Map-Reduce.
> We have written few HBase Map-reduces which are not giving us the
> desired/expected performance .
> --
> Thanks & Regards
> Himanish
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