Jon, I am experimenting writing 8 million rows into Cassandra and also experienced some random timeouts, even with 10-second timeout parameter. How do I avoid such timeout at all cost? (I.e. At this time, my priority is to finish the end-to-end test. Don't want the program to fail at all.) This is a one-node server with ms1G and mx2GB. The rest in cassandra.in.share default I think.
Steve On Wed, Jun 30, 2010 at 1:58 AM, Jonathan Ellis <jbel...@gmail.com> wrote: > You could be seeing GC pauses. Did you increase the heap size you gave > Cassandra, when you increased your VM size? > > On Tue, Jun 29, 2010 at 11:57 AM, Oren Benjamin <o...@clearspring.com> > wrote: > > Hi all - first timer here. > > > > I'm experimenting with Cassandra on Rackspace Cloud. Started with 4GB > nodes and saw read latency spikes while streaming was taking place, so I > increased to 8GB to see if limited memory was the issue. Now I'm seeing > very strange behavior during any period that writes are taking place. The > entire (6 node) cluster seems to pause for periods of as much as 5-8 sec. > By that I mean all the stats (cpu, disk, network IO monitored via dstat) > drop to zero or near zero on all nodes simultaneously. Does anyone have > experience with Cassandra on Rackspace or any idea what's going on here? > > > > The pauses are short enough that it's difficult to introspect the > application and determine what it's doing during the pause, but long enough > to cause unacceptable latency for any service built on top of it. > > > > Any ideas or debugging methods would be greatly appreciated, > > > > -- Oren > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of Riptano, the source for professional Cassandra support > http://riptano.com >
