RE: Tracking down read latency

Thank you both for your advice. See my updated iostats below. >From: sridhar.ba...@gmail.com [mailto:sridhar.ba...@gmail.com] On Behalf Of sridhar basam >Sent: Thursday, February 03, 2011 10:58 AM >To: user@cassandra.apache.org >Subject: Re: Tracking down read latency > >The data provided is als

RE: CF Read and Write Latency Histograms

Is this 0.7? -Original Message- From: Oleg Proudnikov [mailto:ol...@cloudorange.com] Sent: Friday, February 04, 2011 11:42 AM To: user@cassandra.apache.org Subject: CF Read and Write Latency Histograms Hi All, I suspect that Write and Read Latency column headers need to be swapped. I am

Tracking down read latency

Hello. We’re encountering some high read latency issues. But our main Cass expert is out-of-office so it falls to me. We're more read than write, though there doesn't seem to be many pending reads. I have seen active/pending row-read at three or four, though. Pool NameActive

Does an unused ColumnFamily consume resources better used by "live" CFs?

We have an old "test" CF and I was wondering if it might be taking resources better used by our app's CFs. Thank you. David

RE: Cassandra and -XX:+UseLargePages

"there be dragons" for Cassandra? I didn't inquire before about experiences with the recent transparent hugepages kernel patch (we're not on that fresh a kernel) but anyone's experiences +/- would be of interest. David Dabbs On 17/01/2011, at 1:45 PM, Chris Goffi

Cassandra and -XX:+UseLargePages

Hello. Can anyone comment on the performance impact (positive or negative) of running Cassandra configured to use large pages under Linux? Yes, YMMV applies, but I thought I'd ask before enlisting sysadmin Fu, etc. Thanks! David

RE: Experiences with Cassandra hardware planning

in this area please chime in! -Eric On Sun, Oct 24, 2010 at 10:36 PM, David Dabbs wrote: Eric, Thanks for the detailed post! Did you need to start your JVMs with numactl in order to take advantage of NUMA? I know the board, OS and JVM must be configured properly, but it's not clear if

RE: Experiences with Cassandra hardware planning

Eric, Thanks for the detailed post! Did you need to start your JVMs with numactl in order to take advantage of NUMA? I know the board, OS and JVM must be configured properly, but it's not clear if the JVMs must be started with numactl. Thanks, David From: Eric Rosenberry [mailto:epros...@g

RE: Follow-up post on Cassandra configuration with some experiments on GC tuning

>Jonathan Ellis > >added CMSInitiatingOccupancyFraction=80 for 0.6.6 and 0.7beta2 When do you expect 0.6.6 to land? Thanks, David

RE: IMPORTANT: SVN repo has moved

That doesn't seem to work. . . \dev\cassandra>svn switch https://svn.apache.org/repos/asf/cassandra/trunk svn: 'http://svn.apache.org/repos/asf/incubator/cassandra/trunk' is not the same repository as 'https://svn.apache.org/repos/asf' > -Original Message- > From: Ian Holsman >