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From Radim Kolar <>
Subject Re: Cassandra OOM
Date Wed, 04 Jan 2012 12:25:25 GMT
 > Looking at heap dumps, a lot of memory is taken by memtables, much 
more than 1/3 of heap. At the same time, logs say that it has nothing to 
flush since there are not dirty memtables.
I seen this too.

 > So, what are cassandra memory requirement? Is it 1% or 2% of disk data?
It depends on number of rows you have. if you have lot of rows then 
primary memory eaters are index sampling data and bloom filters. I use 
index sampling 512 and bloom filters set to 4% to cut down memory needed.

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