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From Ananth Gundabattula <>
Subject Regarding Row Cache configuration and non-heap memory
Date Thu, 04 Oct 2012 02:21:32 GMT

I have configured cassandra 1.1.4 to use row cache of 10GB ( the RAM on the
machine is pretty big and hence the row cache size is high).  My heap
settings are 8G and new heap size is 1600M.

As I read from the forum and documentation, jna.jar allows to use non-heap
memory for the row caches.

The question I have is how is the configuration in cassandra.yaml for
row_cache_size_in_mb interpreted? Is it referring to the non-heap setting
or the memory used inside the heap to maintain book-keeping information
about the non-heap memory ( as I gather from the postings that heap is
indeed used to some extent while still using the non-heap memory for row

In short the question is whether the row_cache_size_in_mb can exceed the
heap setting for cassandra 1.1.4 if jna.jar is present in the libs?

Thanks for your time.


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