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From Stack <saint....@gmail.com>
Subject Re: HBase Transaction per second in Map-Reduce
Date Tue, 24 May 2011 21:16:51 GMT
Figure first what is slow before adding yet more stuff



On May 24, 2011, at 14:06, Himanish Kushary <himanish@gmail.com> wrote:

> Don't worry..its ok...i am going through one of those days for the last few
> days :-)
> 
> Jokes apart, when you talk about Caching, could we put something like
> ehCache in-front of hbase integrated like a level-2 cache on top of the
> already provided block cache ?
> 
> - Himanish
> 
> On Tue, May 24, 2011 at 3:19 PM, Michael Segel <michael_segel@hotmail.com>wrote:
> 
>> 
>> Sorry,
>> Its been one of those days.
>> 
>> ----------------------------------------
>>> From: michael_segel@hotmail.com
>>> To: user@hbase.apache.org
>>> Subject: RE: HBase Transaction per second in Map-Reduce
>>> Date: Tue, 24 May 2011 14:18:28 -0500
>>> 
>>> 
>>> 
>>> Himanish,
>>> 
>>> 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.
>>> 
>>> -Mike
>>> 
>>> 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
>>> 
>> 
>> 
> 
> 
> 
> -- 
> Thanks & Regards
> Himanish

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