From user-return-15367-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Sun Apr 03 01:21:51 2011 Return-Path: Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: (qmail 56697 invoked from network); 3 Apr 2011 01:21:51 -0000 Received: from hermes.apache.org (HELO mail.apache.org) (140.211.11.3) by minotaur.apache.org with SMTP; 3 Apr 2011 01:21:51 -0000 Received: (qmail 59459 invoked by uid 500); 3 Apr 2011 01:21:49 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 59425 invoked by uid 500); 3 Apr 2011 01:21:49 -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 59417 invoked by uid 99); 3 Apr 2011 01:21:49 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 03 Apr 2011 01:21:49 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS,T_TO_NO_BRKTS_FREEMAIL X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of anurag.gujral@gmail.com designates 209.85.212.170 as permitted sender) Received: from [209.85.212.170] (HELO mail-px0-f170.google.com) (209.85.212.170) by apache.org (qpsmtpd/0.29) with ESMTP; Sun, 03 Apr 2011 01:21:41 +0000 Received: by pxi19 with SMTP id 19so1965988pxi.29 for ; Sat, 02 Apr 2011 18:21:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:date:message-id:subject:from:to :content-type; bh=pSfJ9MY3eS/j9LDomSEXo8hBl470CdamvYEfemOTfMs=; b=dGliywkv427NREAOlvZVj+Px272IiTHULdysNyifMGb5GwwnVc4f+0DvRB6aoHESE5 sK0oTfJOHvxf4yTOb0ZISXDFmgbGf9tfDLCnymWSXDeISKKy8XAVhdHAsi3XUdSOyuiT 1gB8sOtLIEqPkZ/t0+PFMuRlNjHBiof8moMnA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; b=ZaubNGBGcxhH6KiLSMPbFQY5sOJCIDTRwE5uOQCJgK9J6VrEiCzUR13ERtRpdG5kSU djC7rQSw4c4yLtWnu/JdrYRnrjju1vf58SESzKb7BbfrgKQhOF4dQK9Q3jis7Xm40S/f 5P9Mz91D9BlQpL5EK9LY1vmNHAIWosaVB07Ag= MIME-Version: 1.0 Received: by 10.142.192.9 with SMTP id p9mr4527934wff.421.1301793680427; Sat, 02 Apr 2011 18:21:20 -0700 (PDT) Received: by 10.68.56.227 with HTTP; Sat, 2 Apr 2011 18:21:20 -0700 (PDT) Date: Sat, 2 Apr 2011 18:21:20 -0700 Message-ID: Subject: compaction behaviour From: Anurag Gujral To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=000e0cd23b84e48ce5049ff9758e X-Virus-Checked: Checked by ClamAV on apache.org --000e0cd23b84e48ce5049ff9758e Content-Type: text/plain; charset=ISO-8859-1 Hi All, I have loaded data into cassandra using batch processing the response times for reads are in the range of 0.8 ms but I am using SSDs. so I expect the read times to be even faster. Every time I run compaction the latency numbers reduce to 0.3 to 0.4ms , is there a way I can run compaction once with some parameters so that i can get the same numbers 0.3 to 0.4 ms for reads. Please note that I am not loading the data again. Thanks Anurag --000e0cd23b84e48ce5049ff9758e Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi All,
=A0=A0 =A0 =A0 =A0 =A0 I have loaded data into cassandra using = batch processing =A0the response times for reads are in the range of =A00.8= ms but I am using SSDs.=A0so I expect the read times to be even faster.
Every time I run compaction the latency numbers reduce to 0.3 to 0.= 4ms =A0, is there a way I can run compaction once with some parameters=A0
so that i can get the same numbers 0.3 to 0.4 ms for reads.
= Please note that I am not loading the data again.

= Thanks
Anurag
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