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From kannan chandrasekaran <>
Subject Heap Settings suggestions
Date Thu, 07 Oct 2010 18:19:56 GMT
>From the Cassandra documentation @ riptano I see the following recommendation 
for Heap size setting

MemtableThroughputInMB * 3 * (number of ColumnFamilies) + 1G + (size of internal 

What if there is more than one keyspace in the system ? Assuming each keyspace 
has the same number of column families, Can I linearly scale the above 
recommendation to the number of keyspaces in the system .ie, if the "X" is the 
heap size for a single keyspace and there are "Y" keyspaces, Is it recommended 
to allocate "XY" as the max  Heap size ?  Please let me know.


PS: Thanks a lot for the documentation and recommendations.

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