From user-return-27353-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Mon Jul 2 15:59:37 2012 Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 71BC5DC86 for ; Mon, 2 Jul 2012 15:59:37 +0000 (UTC) Received: (qmail 32067 invoked by uid 500); 2 Jul 2012 15:59:35 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 32038 invoked by uid 500); 2 Jul 2012 15:59:35 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 32030 invoked by uid 99); 2 Jul 2012 15:59:35 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 02 Jul 2012 15:59:35 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=FSL_RCVD_USER,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_NEUTRAL X-Spam-Check-By: apache.org Received-SPF: neutral (nike.apache.org: local policy) Received: from [209.85.213.43] (HELO mail-yw0-f43.google.com) (209.85.213.43) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 02 Jul 2012 15:59:29 +0000 Received: by yhl10 with SMTP id 10so168012yhl.30 for ; Mon, 02 Jul 2012 08:59:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:x-gm-message-state; bh=nWDL+Sw8O1yV2j35K3WIu+8mnUmb8ErgSH8Bh1/Ta7Y=; b=NDyZX57M8jWr9hb/cSRW7skQY0WlbFbYEZRFfPXLtJMdxkRvYDzcyBheSrSR1cHoys FAoB/KlK8Ny079Z+555Kkj1FUWS02xub6WCYNe63I8nNrQyk5dpvUiHPoUnwNNIyRhFy hhICIgu3TXrSRSkHaIVqP/al4L4d+1Tt5gCr5znj7LYoIfqEmqcSo3jMnJ/fSWTzg7Mw ID5hshyv809l0MrUppmHc/yYwnHo7IkpVvoxYy5Js/kFnd8l+boFz8VxgLI7P+cnWQJp fxY6WwfUZmBzA6GYtp8kNeiwcmtq7Jb3mdFwyh8ataUu0x/A9DnxdTfiRYIq8sKM+6cQ JWqg== MIME-Version: 1.0 Received: by 10.50.197.232 with SMTP id ix8mr7796196igc.73.1341244748130; Mon, 02 Jul 2012 08:59:08 -0700 (PDT) Received: by 10.50.213.105 with HTTP; Mon, 2 Jul 2012 08:59:08 -0700 (PDT) In-Reply-To: References: Date: Mon, 2 Jul 2012 17:59:08 +0200 Message-ID: Subject: Re: jscv CPU Consumption From: Olivier Mallassi To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=14dae93404b7c4e80b04c3dae04a X-Gm-Message-State: ALoCoQniv/RJJCbcZXMaKbYjOFw+g6kjzeZBEudiODvYZ76b2Big1VR2FdVGf/Y4IC5DOinKvH3h --14dae93404b7c4e80b04c3dae04a Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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 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 > 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 availabl= e > > CPUs. > > > > Is that link to JNA? do you have any ideas? > > > > Cheers > > > > -- > > ............................................................ > > Olivier Mallassi > > OCTO Technology > > ............................................................ > > 50, Avenue des Champs-Elys=E9es > > 75008 Paris > > > > Mobile: (33) 6 28 70 26 61 > > T=E9l: (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 > --=20 ............................................................ Olivier Mallassi OCTO Technology ............................................................ 50, Avenue des Champs-Elys=E9es 75008 Paris Mobile: (33) 6 28 70 26 61 T=E9l: (33) 1 58 56 10 00 Fax: (33) 1 58 56 10 01 http://www.octo.com Octo Talks! http://blog.octo.com --14dae93404b7c4e80b04c3dae04a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Thanks for the answer. In f= act this is maybe simpler.=A0

We do a lot of inserts and a couple of = reads.=A0
- tpstats show us the = pending read stage was growing.=A0
-=A0It seems there was an issue wit= h one of our request. We have 4 indexed columns (UT8Type)=A0
First, one of t= he 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)= .=A0

Do you have a= ny ideas, advices on how to investigate in more details?=A0

Any help would be = appreciate.=A0


On Sun, Jul 1, 2012 at 8:5= 6 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<= br> > 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 availab= le
> CPUs.
>
> Is that link to JNA? do you have any ideas?
>
> Cheers
>
> --
> ............................................................
> Olivier Mallassi
> OCTO Technology
> ............................................................
> 50, Avenue des Champs-Elys=E9es
> 75008 Paris
>
> Mobile: (33) 6 28 70 26 61
> T=E9l: (33) 1 58 56 10 00
> Fax: (33) 1 58 56 10 01
>
> http://www.octo.com<= /a>
> 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.c= om



-- ............................................................
Olivier M= allassi
OCTO Technology
.............................................= ...............
50, Avenue des Champs-Elys=E9es
75008 Paris

Mobile: (33) 6 28 70 = 26 61
T=E9l: (33) 1 58 56 10 00
Fax: (33) 1 58 56 10 01

http://www.octo.com
Oct= o Talks! http://blog.oct= o.com


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