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From srmore <comom...@gmail.com>
Subject Re: Cassandra Heap Size for data more than 1 TB
Date Wed, 02 Oct 2013 14:32:59 GMT
I changed my index_interval from 128 to index_interval: 128 to 512, does it
make sense to increase more than this ?


On Wed, Oct 2, 2013 at 9:30 AM, cem <cayiroglu@gmail.com> wrote:

> Have a look to index_interval.
>
> Cem.
>
>
> On Wed, Oct 2, 2013 at 2:25 PM, srmore <comomore@gmail.com> wrote:
>
>> The version of Cassandra I am using is 1.0.11, we are migrating to 1.2.X
>> though. We had tuned bloom filters (0.1) and AFAIK making it lower than
>> this won't matter.
>>
>> Thanks !
>>
>>
>> On Tue, Oct 1, 2013 at 11:54 PM, Mohit Anchlia <mohitanchlia@gmail.com>wrote:
>>
>>> Which Cassandra version are you on? Essentially heap size is function of
>>> number of keys/metadata. In Cassandra 1.2 lot of the metadata like bloom
>>> filters were moved off heap.
>>>
>>>
>>> On Tue, Oct 1, 2013 at 9:34 PM, srmore <comomore@gmail.com> wrote:
>>>
>>>> Does anyone know what would roughly be the heap size for cassandra with
>>>> 1TB of data ? We started with about 200 G and now on one of the nodes we
>>>> are already on 1 TB. We were using 8G of heap and that served us well up
>>>> until we reached 700 G where we started seeing failures and nodes flipping.
>>>>
>>>> With 1 TB of data the node refuses to come back due to lack of memory.
>>>> needless to say repairs and compactions takes a lot of time. We upped the
>>>> heap from 8 G to 12 G and suddenly everything started moving rapidly i.e.
>>>> the repair tasks and the compaction tasks. But soon (in about 9-10 hrs) we
>>>> started seeing the same symptoms as we were seeing with 8 G.
>>>>
>>>> So my question is how do I determine what is the optimal size of heap
>>>> for data around 1 TB ?
>>>>
>>>> Following are some of my JVM settings
>>>>
>>>> -Xms8G
>>>> -Xmx8G
>>>> -Xmn800m
>>>> -XX:NewSize=1200M
>>>> XX:MaxTenuringThreshold=2
>>>> -XX:SurvivorRatio=4
>>>>
>>>> Thanks !
>>>>
>>>
>>>
>>
>

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