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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Row cache off-heap ?
Date Mon, 11 Mar 2013 09:26:06 GMT
I can add that I have JNA corectly loaded, from the logs: "JNA mlockall
successful"


2013/3/11 Alain RODRIGUEZ <arodrime@gmail.com>

> Any clue on this ?
>
> Row cache well configured could avoid us a lot of disk read, and IO
> is definitely our bottleneck... If someone could explain why the row cache
> has so much impact on my JVM and how to avoid it, it would be appreciated
> :).
>
>
> 2013/3/8 Alain RODRIGUEZ <arodrime@gmail.com>
>
>> Hi,
>>
>> We have some issue having a high read throughput. I wanted to alleviate
>> things by turning the row cache ON.
>>
>> I set the row cache to 200 on one node and enable caching 'ALL' on the 3
>> most read CF. There is the effect this operation had on my JVM:
>> http://img692.imageshack.us/img692/4171/datastaxopscenterr.png
>>
>> It looks like the row cache was somehow stored in-heap. I looked at my
>> cassandra.yaml and I have the following configuration: row_cache_provider:
>> SerializingCacheProvider (which should be enough to store row cache
>> off-heap as described above in this file: "SerializingCacheProvider
>> serialises the contents of the row and stores it in native memory, i.e.,
>> off the JVM Heap")
>>
>> What's wrong ?
>>
>
>

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