On Mon, Oct 25, 2010 at 3:10 PM, Eric Rosenberry <e...@rosenberry.org> wrote: >> I don't follow the reasoning there. Row cache or fs cache, it will be >> hot after reading it once, the difference is that doing a read to the >> cached data is much faster from row cache. > > Yeah, I would have thought the same. Benjamin Black actually recommended we > go this route as with our dataset (we have huge numbers of super-tiny rows) > it would take weeks of running for the row cache to become useful.
Sounds like the assumption is that the FS cache's guessing that if one row from a data page is hot, the rest of the page will too, will be helpful. Depending on your workload it may help, or it may be counterproductive. :) -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
