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From Alain RODRIGUEZ <arodr...@gmail.com>
Subject Re: Row cache off-heap ?
Date Mon, 11 Mar 2013 08:12:19 GMT
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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