look for GCInspector On Wed, Jun 1, 2011 at 2:30 PM, Sasha Dolgy <sdo...@gmail.com> wrote: > is there a specific string I should be looking for in the logs that > isn't super obvious to me at the moment... > > On Tue, May 31, 2011 at 8:21 PM, Jonathan Ellis <jbel...@gmail.com> wrote: >> The place to start is with the statistics Cassandra logs after each GC. >> >> On Tue, May 31, 2011 at 5:01 AM, Sasha Dolgy <sdo...@gmail.com> wrote: >>> hi everyone, >>> >>> the current nodes i have deployed (4) have all been working fine, with >>> not a lot of data ... more reads than writes at the moment. as i had >>> monitoring disabled, when one node's OS killed the cassandra process >>> due to out of memory problems ... that was fine. 24 hours later, >>> another node, 24 hours later, another node ...until finally, all 4 >>> nodes no longer had cassandra running. >>> >>> When all nodes are started fresh, CPU utilization is at about 21% on >>> each box. after 24 hours, this goes up to 32% and then 51% 24 hours >>> later. >>> >>> originally I had thought that this may be a result of 'nodetool >>> repair' not being run consistently ... after adding a cronjob to run >>> every 24 hours (staggered between nodes) the problem of the increasing >>> memory utilization does not resolve. >>> >>> i've read the operations page and also the >>> http://wiki.apache.org/cassandra/MemtableThresholds page. i am >>> running defaults and 0.7.6-02 ... >>> >>> what are the best places to start in terms of finding why this is >>> happening? CF design / usage? 'nodetool cfstats' gives me some good >>> info ... and i've already implemented some changes to one CF based on >>> how it had ballooned (too many rows versus not enough columns) >>> >>> suggestions appreciated >>> >>> -- >>> Sasha Dolgy >>> sasha.do...@gmail.com >>> >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com >> > > > > -- > Sasha Dolgy > sasha.do...@gmail.com >
-- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
