Re: cassandra row cache

2011-01-13 Thread Jonathan Ellis
does the cache size change between 2nd and 3rd time? On Thu, Jan 13, 2011 at 10:47 AM, Saket Joshi wrote: > Hi, > > I am running a 15 node cluster ,version 0.6.8, Linux 64bit OS, using mmap > I/O, 6GB ram allocated. I have row cache enabled to 8 keys (mean row > size is 2KB). I am observing a

RE: cassandra row cache

2011-01-13 Thread Saket Joshi
Yes it does change. -Original Message- From: Jonathan Ellis [mailto:jbel...@gmail.com] Sent: Thursday, January 13, 2011 11:01 AM To: user Subject: Re: cassandra row cache does the cache size change between 2nd and 3rd time? On Thu, Jan 13, 2011 at 10:47 AM, Saket Joshi wrote: >

Re: cassandra row cache

2011-01-13 Thread Ryan King
this though. -ryan On Thu, Jan 13, 2011 at 11:05 AM, Saket Joshi wrote: > Yes it does change. > > -Original Message- > From: Jonathan Ellis [mailto:jbel...@gmail.com] > Sent: Thursday, January 13, 2011 11:01 AM > To: user > Subject: Re: cassandra row cache > > does t

Re: cassandra row cache

2011-01-13 Thread Chris Burroughs
On 01/13/2011 02:05 PM, Saket Joshi wrote: > Yes it does change. > So the confusing part for me is why a cache of size 80,000 would not be fill after 1,600,000 requests. Can you observe items cached and hit rate while making the first 1.6 million row query?

RE: cassandra row cache

2011-01-13 Thread Saket Joshi
- From: Chris Burroughs [mailto:chris.burrou...@gmail.com] Sent: Thursday, January 13, 2011 1:03 PM To: user@cassandra.apache.org Cc: Saket Joshi Subject: Re: cassandra row cache On 01/13/2011 02:05 PM, Saket Joshi wrote: > Yes it does change. > So the confusing part for me is why a cache o

Re: cassandra row cache

2011-01-13 Thread Edward Capriolo
jumps to 99% > > > -Saket > > -Original Message- > From: Chris Burroughs [mailto:chris.burrou...@gmail.com] > Sent: Thursday, January 13, 2011 1:03 PM > To: user@cassandra.apache.org > Cc: Saket Joshi > Subject: Re: cassandra row cache > > On 01/13/2011 02

Re: cassandra row cache

2011-01-13 Thread Jonathan Ellis
On Thu, Jan 13, 2011 at 2:00 PM, Edward Capriolo wrote: > Is it possible that your are reading at READ.ONE and that READ.ONE > only warms cache on 1 of your three nodes= 20. 2nd read warms another > 60%, and by the third read all the replicas are warm? 99% ? > > This would be true if digest reads

Re: cassandra row cache

2011-01-14 Thread Mike Malone
Digest reads could be being dropped..? On Thu, Jan 13, 2011 at 4:11 PM, Jonathan Ellis wrote: > On Thu, Jan 13, 2011 at 2:00 PM, Edward Capriolo > wrote: > > Is it possible that your are reading at READ.ONE and that READ.ONE > > only warms cache on 1 of your three nodes= 20. 2nd read warms anot

Re: cassandra row cache

2011-01-14 Thread Jonathan Ellis
That's possible, yes. He'd want to make sure there aren't any of those WARN messages in the logs. On Fri, Jan 14, 2011 at 11:46 AM, Mike Malone wrote: > Digest reads could be being dropped..? > > On Thu, Jan 13, 2011 at 4:11 PM, Jonathan Ellis wrote: >> >> On Thu, Jan 13, 2011 at 2:00 PM, Edwar

Re: Cassandra row-cache API

2020-12-14 Thread Jeff Jirsa
Sometime around 2.0 or 2.1, it was changed from a "partition cache" to a "head of the partition cache", where "head of the partition" means "first N clustering". The reason individual rows are "hard" is the same reason most things with Cassandra caching and consistency are "hard" - a clustering /

Re: Cassandra row-cache API

2020-12-14 Thread Chidamber Kulkarni
Thanks Jeff, the summary at the end is very insightful - something we also are observing. On a related note, we do observe that the "first N clustering" doesn't exactly behave the way it is documented to. Is it related to this open ticket CASSANDRA-8646