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From Jonathan Ellis <>
Subject Re: mmap:ed i/o and buffer sizes
Date Wed, 15 Dec 2010 22:58:00 GMT
On Fri, Dec 10, 2010 at 2:45 PM, Peter Schuller <
> wrote:

> I was looking closer at sliced_buffer_size_in_kb and
> column_index_size_in_kb and reached the conclusion that for the
> purpose of I/O, these are irrelevant when using mmap:ed I/O mode
> (which makes sense, since there is no way to use a "buffer size" when
> all you're doing is touching memory). The only effect is that
> column_index_size_in_kb still affects the size at which indexing
> triggers, which is as advertised.
> Firstly, can anyone confirm/deny my interpretation?

That's correct.

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

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