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From aaron morton <aa...@thelastpickle.com>
Subject Re: compaction behaviour
Date Mon, 04 Apr 2011 12:23:19 GMT
Is "nodetool compact" what you are looking for ? 

Aaron

On 4 Apr 2011, at 05:35, Anurag Gujral wrote:

> Hi Zhu,
>              I did not got that SSDs  have read latency of 0.1ms.Since there is only
one data file
> I would expect the read of any key to take 0.1ms may be I am missing something
> please explain.
> Thanks
> Anurag
> 
> On Sun, Apr 3, 2011 at 5:01 AM, Zhu Han <schumi.han@gmail.com> wrote:
> 
> best regards,
> Zhu Han
> 
> 
> 
> On Sun, Apr 3, 2011 at 9:21 AM, Anurag Gujral <anurag.gujral@gmail.com> wrote:
> Hi All,
>            I have loaded data into cassandra using batch processing  the response times
for reads are in the range of  0.8 ms but I am using SSDs. so I expect the read times to be
even faster.
> 
> Does your working set fit in the memory? If so, SSD is not helpful to reduce the latency.
>  
> Every time I run compaction the latency numbers reduce to 0.3 to 0.4ms  , is there a
way I can run compaction once with some parameters 
> so that i can get the same numbers 0.3 to 0.4 ms for reads.
> Please note that I am not loading the data again.
> 
> Thanks
> Anurag
> 
> 


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