Heap dump is really the gold standard for analysis, but if you don't want to take a heap dump for some reason:

1. Decrease the cache sizes
2. Increase the index interval size

These in combination may reduce pressure on the heap enough so you do not see these warnings in the log.

On Mon, Feb 27, 2012 at 4:12 PM, Roshan <codevally@gmail.com> wrote:
As a configuration issue, I haven't enable the heap dump directory.

Is there another way to find the cause to this and identify possible
configuration changes?

Thanks.

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DataStax -- The Apache Cassandra Company