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From Curt Bererton <>
Subject Re: Problems running Cassandra 0.6.1 on large EC2 instances.
Date Tue, 18 May 2010 17:38:36 GMT
We only have a few CFs (6 or 7).  I've increased the MemtableThroughputInMB
and MemtableOperationsInMillions as per your suggestions. Do we really need
a swap file though? I suppose it can't hurt, but with my problem in
particular we weren't maxing out main memory.

We'll be running another test today and see if the settings changes proposed
so far fix our problem ( I hope so ).


On Tue, May 18, 2010 at 5:59 AM, Lee Parker <> wrote:

> How many different CFs do you have?  If you only have a few, I would highly
> recommend increasing the MemtableThroughputInMB and MemtableOperationsInMillions.
>  We only have to CFs and I have it set at 256MB and 2.5m. Since most of our
> columns are relatively small, these values are practically equivalent to
> each other.  I would also recommend dropping your heap space to 6G and
> adding a swap file.  In our case, the large EC2 instances didn't have any
> swap setup by default.
> Lee Parker

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