> 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 <jbel...@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 <omalla...@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 > >
