At times of high load check the CPU % for the java service running C* to confirm C* is the source of load.
If the load is generated from C* check the logs (or use OpsCentre / other monitoring) to see if it correlated to compaction, or Garbage Collection or repair or high throughput. Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 17/10/2012, at 12:22 PM, Ben Kaehne <ben.kae...@sirca.org.au> wrote: > Nothing unusual. > > All servers are exactly the same. Nothing unusual in the log files. Is there > any level of logging that I should be turning on? > > Regards, > > On Wed, Oct 17, 2012 at 9:51 AM, Andrey Ilinykh <ailin...@gmail.com> wrote: > With your environment (3 nodes, RF=3) it is very difficult to get > uneven load. Each node receives the same number of read/write > requests. Probably something is wrong on low level, OS or VM. Do you > see anything unusual in log files? > > Andrey > > On Tue, Oct 16, 2012 at 3:40 PM, Ben Kaehne <ben.kae...@sirca.org.au> wrote: > > Not connecting to the same node every time. Using Hector to ensure an even > > distribution of connections accross the cluster. > > > > Regards, > > > > On Sat, Oct 13, 2012 at 4:15 AM, B. Todd Burruss <bto...@gmail.com> wrote: > >> > >> are you connecting to the same node every time? if so, spread out > >> your connections across the ring > >> > >> On Fri, Oct 12, 2012 at 1:22 AM, Alexey Zotov <azo...@griddynamics.com> > >> wrote: > >> > Hi Ben, > >> > > >> > I suggest you to compare amount of queries for each node. May be the > >> > problem > >> > is on the client side. > >> > Yoy can do that using JMX: > >> > "org.apache.cassandra.db:type=ColumnFamilies,keyspace=<YOUR > >> > KEYSPACE>,columnfamily=<YOUR CF>","ReadCount" > >> > "org.apache.cassandra.db:type=ColumnFamilies,keyspace=<YOUR > >> > KEYSPACE>,columnfamily=<YOUR CF>","WriteCount" > >> > > >> > Also I suggest to check output of "nodetool compactionstats". > >> > > >> > -- > >> > Alexey > >> > > >> > > > > > > > > > > > -- > > -Ben > > > > -- > -Ben
