If you are using off-heap memory for row cache, "all writes invalidate the entire row" should be correct.
Boris On Fri, Aug 23, 2013 at 8:32 AM, Robert Coli <rc...@eventbrite.com> wrote: > On Wed, Aug 14, 2013 at 10:56 PM, Faraaz Sareshwala < > fsareshw...@quantcast.com> wrote: > >> >> - All writes invalidate the entire row (updates thrown out the cached >> row) >> >> This is not correct. Writes are added to the row, if it is in the row > cache. If it's not in the row cache, the row is not added to the cache. > > Citation from jbellis on stackoverflow, because I don't have time to find > a better one and the code is not obvious about it : > > http://stackoverflow.com/a/12499422 > > I have yet to go through the source code for the row cache. I do plan to >> do that. Can someone point me to documentation on the row cache internals? >> All I've found online so far is small discussion about it and how to enable >> it. >> > > There is no such documentation, or at least if it exists I am unaware of > it. > > In general, the rule of thumb is that the Row Cache should not be used > unless the rows in question are : > > 1) Very hot in terms of access > 2) Uniform in size > 3) "Small" > > =Rob >
