If you didn't GC post-flush then it's just leftovers. An "empty" Cassandra (nothing in memtables or cache) will use 5-10MB of heap.
On Thu, Aug 4, 2011 at 9:38 PM, Yang <teddyyyy...@gmail.com> wrote: > I ran my cassandra cluster on one node, inserted about 500000 rows, > each about 400 bytes, then the heap went up to 800MB, and constantly > goes into full GC. I guessed that the memtable was probably taking a > lot of space, so I did a node tool flush, so that > all memtable are changed to 0. after this, the heap came down a bit, to > 500MB. > > but I thought it should be close to 0 right after the flush?? or else > what is taking up the space? > I'm still trying to look at the hprof file to figure out, but it seems > difficult too > > > Thanks > Yang > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
