Hi Aaron, list,
Thanks for the input. But... We figured out what the reason is:
https://issues.apache.org/jira/browse/CASSANDRA-5677
we've eliminated the two major spots where we did deletes and things
have calmed down. Timeouts still happen and we're eagerly awaiting 1.2.7.
Cheers
Steffen
Am 09.07.2013 00:58, schrieb aaron morton:
It started with Cassandra 1.1.10 and on Friday we've migrated to 1.2.6
and now we have the issue that flushes are no longer executed
automatically - we have to do them every hour by hand (nodetool flush)
in order to keep the nodes on an acceptable utilizatzion
level. Without manual flush the CPU goes mad after a couple of hours
on each instance.
It may be that because 1.2 manages it's memory better it has to flush to
disk less frequently in your use case. We flush to disk based on memory
usage and log file growth.
Can you explain what happens when the CPU goes mad ?
Is there a way to find out which tasks are pending? Is there a way to
cancel them?
This looks like an error in the way the count is being handled, if there
are pending tasks they would be running.
There was a recent issue like this that was fixed in 1.2.5
https://issues.apache.org/jira/browse/CASSANDRA-5554?attachmentOrder=asc
If this is happening reliability can you create a new ticket and include
the version and the compaction strategy.
Cheers
-----------------
Aaron Morton
Freelance Cassandra Consultant
New Zealand
@aaronmorton
http://www.thelastpickle.com
On 8/07/2013, at 9:21 PM, Steffen Rusitschka <r...@megazebra.com
<mailto:r...@megazebra.com>> wrote:
The heap size is 3GB and the GC has to run only every 30 minutes...
I'm pretty sure increasing heap won't help.
Am 08.07.2013 11:15, schrieb Radim Kolar:
Without manual flush the CPU goes mad after a couple of hours on each
instance.
increase heap size
--
Steffen Rusitschka
CTO
MegaZebra GmbH
Steinsdorfstraße 2
81538 München
Phone +49 89 80929577
r...@megazebra.com <mailto:r...@megazebra.com>
Challenge me at www.megazebra.com
MegaZebra GmbH
Geschäftsführer: Henning Kosmack, Christian Meister, Steffen Rusitschka
Sitz der Gesellschaft: München, HRB 177947
--
Steffen Rusitschka
CTO
MegaZebra GmbH
Steinsdorfstraße 2
81538 München
Phone +49 89 80929577
r...@megazebra.com
Challenge me at www.megazebra.com
MegaZebra GmbH
Geschäftsführer: Henning Kosmack, Christian Meister, Steffen Rusitschka
Sitz der Gesellschaft: München, HRB 177947
