Well, maybe should you describe us your hardware and the C* release toi are using. Also give us some metrics. Le 30 avr. 2013 18:48, "Steppacher Ralf" < ralf.steppac...@derivativepartners.com> a écrit :
> Hi, > > I have troubles finding some quantitative information as to how a healthy > Cassandra node should look like (CPU usage, number of flushes,SSTables, > compactions, GC), given a certain hardware spec and read/write load. I have > troubles gauging our first and only Cassandra node, whether it needs tuning > or is simply overloaded. > If anyone could point me to some data that would be very helpful. > > (So far I have run the node with the default settings in cassandra.yaml > and cassandra-env. The log claims that the server is occasionally under > memory pressure and I get frequent timeouts for writes. I see what I think > are many flushes, compactions and GCs in the log. Some toying with heap and > new gen sizes, key cache, and the compaction throughput settings did not > improve the overall situation much.) > > > Thanks! > Ralf >
