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From cem <cayiro...@gmail.com>
Subject Re: Cassandra Heap Size for data more than 1 TB
Date Wed, 02 Oct 2013 15:19:31 GMT
I think 512 is fine. Could you tell more about your traffic
characteristics?

Cem


On Wed, Oct 2, 2013 at 4:32 PM, srmore <comomore@gmail.com> wrote:

> 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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