"called index_interval set to 128" I think this is for BloomFilters actually.
2013/3/13 Hiller, Dean <dean.hil...@nrel.gov> > Going to 1.2.2 helped us quite a bit as well as turning on LCS from STCS > which gave us smaller bloomfilters. > > As far as key cache. There is an entry in cassandra.yaml called > index_interval set to 128. I am not sure if that is related to key_cache. > I think it is. By turning that to 512 or maybe even 1024, you will > consume less ram there as well though I ran this test in QA and my key > cache size stayed the same so I am really not sure(I am actually checking > out cassandra code now to dig a little deeper into this property. > > Dean > > From: Alain RODRIGUEZ <arodr...@gmail.com<mailto:arodr...@gmail.com>> > Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" < > user@cassandra.apache.org<mailto:user@cassandra.apache.org>> > Date: Wednesday, March 13, 2013 10:11 AM > To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" < > user@cassandra.apache.org<mailto:user@cassandra.apache.org>> > Subject: About the heap > > Hi, > > I would like to know everything that is in the heap. > > We are here speaking of C*1.1.6 > > Theory : > > - Memtable (1024 MB) > - Key Cache (100 MB) > - Row Cache (disabled, and serialized with JNA activated anyway, so should > be off-heap) > - BloomFilters (about 1,03 GB - from cfstats, adding all the "Bloom Filter > Space Used" and considering they are showed in Bytes - 1103765112) > - Anything else ? > > So my heap should be fluctuating between 1,15 GB and 2.15 GB and growing > slowly (from the new BF of my new data). > > My heap is actually changing from 3-4 GB to 6 GB and sometimes growing to > the max 8 GB (crashing the node). > > Because of this I have an unstable cluster and have no other choice than > use Amazon EC2 xLarge instances when we would rather use twice more EC2 > Large nodes. > > What am I missing ? > > Practice : > > Is there a way not inducing any load and easy to do to dump the heap to > analyse it with MAT (or anything else that you could advice) ? > > Alain >
