Jonathon, thank you for your answers here.
To explain this bit ...
On 11 March 2011 20:46, Jonathan Ellis jbel...@gmail.com wrote:
On Thu, Mar 10, 2011 at 6:06 AM, Jedd Rashbrooke j...@visualdna.com wrote:
Copying a cluster between AWS DC's:
We have ~ 150-250GB per node
Howdi,
Assortment of questions relating to an upgrade combined with a
possible migration between Data Centers (or perhaps a multi-DC
redesign). Apologies if some of these have been asked before - I
have kept half an eye on the list in recent times but haven't seen
anything covering these
Hi Peter,
I've read through the Very high memory utilization (not caused by mmap
on sstables) and the impact sounds similar .. alas they're using openJDK
and I'm using Sun's. Of course, it's not impossible that the same bug is
present in both JVM's.
j.
Hey Peter,
On 14 December 2010 20:19, Peter Schuller peter.schul...@infidyne.com wrote:
So, now that I get that we have two different cases ;)
Yup. My problem is java / environment based, occurring
after several weeks, using 0.6.6 instances. Our thread
hijacking friend / learned
Peter, Jonathon - thank you for your replies.
I should probably have repeated myself in the body, but as I
mentioned in the subject line, we're running Sun Java 1.6.
On 10 December 2010 18:37, Peter Schuller peter.schul...@infidyne.com wrote:
Memory-mapped files will account for both
Greetings,
I would like to check my understanding is accurate on how
KeysCached is understood by Cassandra (0.6.5), and then
get some suggestions on settings / OS FS cache interplay.
First - my initial understanding was that if you set KeysCached
to 100%, Cassandra would do a best effort
Hi Peter,
Thanks again for your time and thoughts on this problem.
We think we've got a bit ahead of the problem by just
scaling back (quite savagely) on the rate that we try to
hit the cluster. Previously, with a surplus of optimism,
we were throwing very big Hadoop jobs at Cassandra,
On 4 October 2010 10:58, Utku Can Topçu u...@topcu.gen.tr wrote:
Recently I've tried to upgrade (hw upgrade) one of the nodes in my cassandra
cluster from ec2-small to ec2-large.
Something that bit me on this (I've done it with both
Cassandra and Hadoop boxes, and some problems
might be more
Peter - my apologies for the slow response - we had
to divert down a 'Plan B' approach last week involving
MySQL, memcache, redis and various other uglies.
On 20 September 2010 23:11, Peter Schuller peter.schul...@infidyne.com wrote:
Are you running an old JVM by any chance? (Just grasping
Howdi,
I've just landed in an experiment to get Cassandra going, and
fed by PHP via Thrift via Hadoop, all running on EC2. I've been
lurking a bit on the list for a couple of weeks, mostly reading any
threads with the word 'performance' in them. Few people have
anything polite to say
Hi Dave,
Thank you for your response.
I can clarify a couple of things here:
2. You grew from 2 nodes to 4, but the original 2 nodes have 200GB and the 2
new ones have 40 GB. What's the recommended practice for rebalancing (i.e.,
when should you do it), what's the actual procedure, and
Hi Rob,
Thanks for your suggestions. I should have been a bit more verbose
in my platform description -- I'm using 64-bit instances, which I think
in a Ben Black video I saw led to a sensible default usage of mmap
when left at auto. Should I look at forcing this setting?
You don't
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