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From Jonathan Ellis <>
Subject Re: Couple of cache related questions
Date Sun, 12 Sep 2010 20:47:09 GMT
On Sun, Sep 12, 2010 at 2:56 PM, kannan chandrasekaran
<> wrote:
> 1) What determines the amount of memory used per schema ignoring the general
> overhead to get cassandra up and running?  Is it just the size of the caches
> for the column Family + the memtable size ?

and the bloom filter and index samples from the sstable files.

> 2) Is the size of the cache configured ( in terms of absolute numbers or
> percentages), an upper bound on the amount of memory that can be allocated
> and which grows as more data is filled up in the cache ?

no.  it's strictly the number of items you give it.  so you need to be
careful not to make it larger than you have room in the heap.

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of Riptano, the source for professional Cassandra support

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