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Date: Mon, 25 Jun 2012 10:47:42 +0530
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 <CABVqxwAUJGDD2jnYut=RV_oEYakiNW9QPC6ZybBWuKFMJgUV1w@mail.gmail.com>
Subject: Re: Limited row cache size
To: user@cassandra.apache.org
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sorry I meant 1.1.1 build

On Mon, Jun 25, 2012 at 10:40 AM, Noble Paul =E0=B4=A8=E0=B5=8B=E0=B4=AC=E0=
=B4=BF=E0=B4=B3=E0=B5=8D=E2=80=8D  =E0=A4=A8=E0=A5=8B=E0=A4=AC=E0=A5=8D=E0=
=A4=B3=E0=A5=8D
<noble.paul@gmail.com> wrote:
> I was using the datastax build. Do they also have a 1.1 build?
>
> On Mon, Jun 18, 2012 at 9:05 AM, aaron morton <aaron@thelastpickle.com> w=
rote:
>> cassandra 1.1.1 ships with=C2=A0concurrentlinkedhashmap-lru-1.3.jar
>>
>> row_cache_size_in_mb starts life as an int but the byte size is stored a=
s a
>> long
>> https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassa=
ndra/service/CacheService.java#L143
>>
>> Cheers
>>
>>
>> -----------------
>> Aaron Morton
>> Freelance Developer
>> @aaronmorton
>> http://www.thelastpickle.com
>>
>> On 15/06/2012, at 7:13 PM, Noble Paul =E0=B4=A8=E0=B5=8B=E0=B4=AC=E0=B4=
=BF=E0=B4=B3=E0=B5=8D=E2=80=8D =E0=A4=A8=E0=A5=8B=E0=A4=AC=E0=A5=8D=E0=A4=
=B3=E0=A5=8D wrote:
>>
>> hi,
>> I configured my server with a row_cache_size_in_mb : 1920
>>
>> When =C2=A0started the server and checked =C2=A0the JMX it shows the cap=
acity is
>> set to 1024MB .
>>
>> I investigated further and found that the version of
>> concurrentlruhashmap used is 1.2 which sets capacity max value to 1GB.
>>
>> So, in cassandra 1.1 the max cache size I can use is 1GB
>>
>>
>> Digging deeper , I realized that throughout the API chain the cache
>> size is passed around as an int so even if I write my own
>> CacheProvider the max size would be Integer.MAX_VALUE =3D 2GB
>>
>> unless cassandra changes the version of concurrentlruhashmap to 1.3
>> and change the signature to use a long for size, we can't have a big
>> cache. according to me 1 GB is a really small size.
>>
>> So , even if I have bigger machines I can't really use them
>>
>>
>>
>> --
>> -----------------------------------------------------
>> Noble Paul
>>
>>
>
>
>
> --
> -----------------------------------------------------
> Noble Paul


--=20
-----------------------------------------------------
Noble Paul