incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From aaron morton <aa...@thelastpickle.com>
Subject Re: jscv CPU Consumption
Date Wed, 04 Jul 2012 09:13:41 GMT
> Do you have any ideas, advices on how to investigate in more details? 

What sort of read queries are you sending ?
Are you using large multi gets ? 
Are these servers under IO load ? / Is there a lot of compaction going on ?

Cheers


-----------------
Aaron Morton
Freelance Developer
@aaronmorton
http://www.thelastpickle.com

On 3/07/2012, at 3:59 AM, Olivier Mallassi wrote:

> Thanks for the answer. In fact this is maybe simpler. 
> 
> We do a lot of inserts and a couple of reads. 
> - tpstats show us the pending read stage was growing. 
> - It seems there was an issue with one of our request. We have 4 indexed columns (UT8Type)

> First, one of the indexed value was "-----------". we replaced this value by and empty
string and it works better. (running the query in CLI)
> 
> Yet, we still observed pending Read Stage after 10 minutes of run (on a couple of nodes).

> 
> Do you have any ideas, advices on how to investigate in more details? 
> 
> Any help would be appreciate. 
> 
> 
> On Sun, Jul 1, 2012 at 8:56 AM, Jonathan Ellis <jbellis@gmail.com> wrote:
> Sounds like http://wiki.apache.org/cassandra/FAQ#ubuntu_ec2_hangs to me.
> 
> On Fri, Jun 29, 2012 at 1:45 AM, Olivier Mallassi <omallassi@octo.com> wrote:
> > Hi all
> >
> > We have a 12 servers clusters (8 cores by machines..).
> > OS is Ubuntu 10.04.2.
> >
> > On one of the machine (only one) and without any load (no inserts, no
> > reads....), we have a huge CPU Load whereas there is no activities (no
> > compaction in progress etc...)
> > A top on the machine show us the process jscv is using all the available
> > CPUs.
> >
> > Is that link to JNA? do you have any ideas?
> >
> > Cheers
> >
> > --
> > ............................................................
> > Olivier Mallassi
> > OCTO Technology
> > ............................................................
> > 50, Avenue des Champs-Elysées
> > 75008 Paris
> >
> > Mobile: (33) 6 28 70 26 61
> > Tél: (33) 1 58 56 10 00
> > Fax: (33) 1 58 56 10 01
> >
> > http://www.octo.com
> > Octo Talks! http://blog.octo.com
> >
> >
> 
> 
> 
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of DataStax, the source for professional Cassandra support
> http://www.datastax.com
> 
> 
> 
> -- 
> ............................................................
> Olivier Mallassi
> OCTO Technology
> ............................................................
> 50, Avenue des Champs-Elysées
> 75008 Paris
> 
> Mobile: (33) 6 28 70 26 61
> Tél: (33) 1 58 56 10 00
> Fax: (33) 1 58 56 10 01
> 
> http://www.octo.com 
> Octo Talks! http://blog.octo.com
> 
> 


Mime
View raw message