curious how did things turn out?
On Tue, May 18, 2010 at 1:38 PM, Curt Bererton c...@zipzapplay.com wrote:
We only have a few CFs (6 or 7). I've increased the MemtableThroughputInMB
and MemtableOperationsInMillions as per your suggestions. Do we really
need a swap file though? I suppose it
We can get Cassandra to run great for a few hours now. Writing to and
reading from cassandra work well and the read/write times are good etc. We
also changed our config to enable row caching (we're hoping to ditch our
memcache server layer entirely).
Unfortunately, running on an EC2 High Memory
We only have a few CFs (6 or 7). I've increased the MemtableThroughputInMB
and MemtableOperationsInMillions as per your suggestions. Do we really need
a swap file though? I suppose it can't hurt, but with my problem in
particular we weren't maxing out main memory.
We'll be running another test
Can you provide us with the current JVM args? Also, what type of work load
you are giving the ring (op/s)?
On Mon, May 17, 2010 at 6:39 PM, Curt Bererton c...@zipzapplay.com wrote:
Hello Cassandra users+experts,
Hopefully someone will be able to point me in the correct direction. We
have
On Mon, May 17, 2010 at 6:02 PM, Curt Bererton c...@zipzapplay.com wrote:
So pretty much the defaults aside from the 7Gig max heap. CPU is totally
hammered right now, and it is receiving 0 ops/sec from me since I
disconnected it from our application right now until I can figure out what's
What are your storage-conf settings for Memtable thresholds? One thing that
could cause lots of CPU usage is dumping the memtables too frequently and
then having to do lots of compaction. With that much available heap space
you could definitely go larger than the default thresholds. Also, do
Also, I am using batch_mutate for all of my writes.
Lee Parker
On Mon, May 17, 2010 at 7:11 PM, Lee Parker l...@socialagency.com wrote:
What are your storage-conf settings for Memtable thresholds? One thing
that could cause lots of CPU usage is dumping the memtables too frequently
and then
Thanks for the help guys:
First answering the first question: both cores are pegged:
Cpu0 : 43.8%us, 34.0%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si,
22.1%st
Cpu1 : 40.5%us, 36.2%sy, 0.0%ni, 0.4%id, 0.0%wa, 0.0%hi, 0.2%si,
22.6%st
Mem: 7872040k total, 3620180k used, 4251860k
Agreed, and I just saw that in storage conf that a higher value for the
MemtableFlushAfterMinutes is suggested otherwise you might get a flush
storm: of all your memtables flushing at once. I've changed that as well.
--
Curt, ZipZapPlay Inc., www.PlayCrafter.com,
