From user-return-30807-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Sat Dec 29 18:08:23 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 9887EE989 for ; Sat, 29 Dec 2012 18:08:23 +0000 (UTC) Received: (qmail 37774 invoked by uid 500); 29 Dec 2012 18:08:21 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 37745 invoked by uid 500); 29 Dec 2012 18:08:21 -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 37737 invoked by uid 99); 29 Dec 2012 18:08:21 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 29 Dec 2012 18:08:21 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,MIME_QP_LONG_LINE,SPF_HELO_PASS,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of andre.cruz@co.sapo.pt designates 212.55.140.20 as permitted sender) Received: from [212.55.140.20] (HELO sl.pt) (212.55.140.20) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 29 Dec 2012 18:08:12 +0000 Received: (qmail 13664 invoked from network); 29 Dec 2012 18:07:50 -0000 X-AntiVirus: PTMail-AV 0.3-0.95.1 X-Scan-Status: AV clean (0.02832 seconds); Received: from unknown (HELO [46.50.113.96]) (andre.cruz@co.sapo.pt@[46.50.113.96]) (envelope-sender ) by mail-sl-pt02 (qmail-ldap-1.03) with AES128-SHA encrypted SMTP for ; 29 Dec 2012 18:07:50 -0000 Subject: Re: Row cache and counters References: <7AC2D735-70CA-4D50-8B8E-EDE0825E0F57@co.sapo.pt> From: =?utf-8?Q?Andr=C3=A9_Cruz?= Content-Type: multipart/alternative; boundary=Apple-Mail-A233D8A6-BE25-4EBF-8599-60786103E85B X-Mailer: iPhone Mail (10A523) In-Reply-To: Message-Id: Date: Sat, 29 Dec 2012 18:07:48 +0000 To: "" Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) X-Virus-Checked: Checked by ClamAV on apache.org --Apple-Mail-A233D8A6-BE25-4EBF-8599-60786103E85B Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 29/12/2012, at 16:59, rohit bhatia wrote: > Reads during a write still occur during a counter increment with CL ONE, b= ut that latency is not counted in the request latency for the write. Your lo= cal node write latency of 45 microseconds is pretty quick. what is your time= out and the write request latency you see. Most of the time the increments are pretty quick, in the millisecond range. I= have a 8s timeout and sometimes timeouts happen in bursts. =20 > In our deployment we had some issues and we could trace the timeouts to pa= rnew gc collections which were quite frequent. You might just want to take a= look there too. What can we do about that? Which settings did you tune? Thanks, Andr=C3=A9= --Apple-Mail-A233D8A6-BE25-4EBF-8599-60786103E85B Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 29/12/2012, at 16:59, rohi= t bhatia <rohit2412@gmail.com> wrote:

Reads during a write still occur du= ring a counter increment with CL ONE, but that latency is not counted in the= request latency for the write. Your local node write latency of 45 microsec= onds is pretty quick. what is your timeout and the write request latency you= see.

Most of the time the incre= ments are pretty quick, in the millisecond range. I have a 8s timeout and so= metimes timeouts happen in bursts.  

In our deployment we had some is= sues and we could trace the timeouts to parnew gc collections which were qui= te frequent. You might just want to take a look there too.
What can we do about that? Which settings did you= tune?

Thanks,
Andr=C3=A9
= --Apple-Mail-A233D8A6-BE25-4EBF-8599-60786103E85B--