use a larger heap or throttle your writes On Wed, Jun 30, 2010 at 12:12 PM, Steve Lihn <stevel...@gmail.com> wrote: > 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.sh > are 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 > >
-- Jonathan Ellis Project Chair, Apache Cassandra co-founder of Riptano, the source for professional Cassandra support http://riptano.com
