incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Sávio Teles <savio.te...@lupa.inf.ufg.br>
Subject Re: Row cache off-heap ?
Date Mon, 11 Mar 2013 12:30:48 GMT
I have the same problem!

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

> 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 ?
>>>
>>
>>
>


-- 
Atenciosamente,
Sávio S. Teles de Oliveira
voice: +55 62 9136 6996
http://br.linkedin.com/in/savioteles
Mestrando em Ciências da Computação - UFG
Arquiteto de Software
Laboratory for Ubiquitous and Pervasive Applications (LUPA) - UFG

Mime
View raw message