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From Anurag Gujral <anurag.guj...@gmail.com>
Subject Re: compaction behaviour
Date Sun, 03 Apr 2011 19:35:37 GMT
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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