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From Steve Lihn <>
Subject Re: Cluster-wide pause
Date Wed, 30 Jun 2010 19:12:16 GMT
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 default I think.


On Wed, Jun 30, 2010 at 1:58 AM, Jonathan Ellis <> 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 <>
> 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

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