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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: nodetools cfstats question
Date Thu, 29 Sep 2011 18:10:34 GMT
Yes, because the cache is not full so there is no pressure to remove
old entries.

On Thu, Sep 29, 2011 at 11:52 AM, Sanjeev Kulkarni
<sanjeev@locomatix.com> wrote:
> Hi Thamizh,
> Thanks for the answer.
> I understand the part about the Key cache capacity being 200000 which is the
> default value.
> But Key cache size being 99k? Does this represent that cassandra has
> allocated 99k for key cache even though the actual keys are far less?
>
> On Thu, Sep 29, 2011 at 3:47 AM, Thamizh <tcegrid@yahoo.co.in> wrote:
>>
>> please check [default@unknown] help create column family;
>> These are default values,  until you explicitly mentioned on CF creation.
>>
>> Regards,
>> Thamizhannal
>> ________________________________
>> From: Sanjeev Kulkarni <sanjeev@locomatix.com>
>> To: user@cassandra.apache.org
>> Sent: Thursday, 29 September 2011 10:33 AM
>> Subject: nodetools cfstats question
>>
>> Hey guys,
>> I'm using a three node cluster running 0.8.6 with rf of 3. Its a freshly
>> installed cluster with no upgrade history.
>> I have 6 cfs and only one of them is written into. That cf has around one
>> thousand keys. A quick key_range_scan verifies this.
>> However when I do cfstats, I see the following for this cf.
>> Number of Keys (estimate): 5248
>> Key cache capacity: 200000
>> Key cache size: 99329
>> What is the definition of these three output values? Both the Number of
>> Keys and Key Cache size are way over what they should be.
>> Thanks!
>>
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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