From user-return-25690-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Mon Apr 23 08:20:36 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 E6E3197EA for ; Mon, 23 Apr 2012 08:20:36 +0000 (UTC) Received: (qmail 55738 invoked by uid 500); 23 Apr 2012 08:20:34 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 55578 invoked by uid 500); 23 Apr 2012 08:20:30 -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 55540 invoked by uid 99); 23 Apr 2012 08:20:29 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 23 Apr 2012 08:20:29 +0000 X-ASF-Spam-Status: No, hits=-2.8 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_HI,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: local policy) Received: from [192.54.144.131] (HELO thsbbfxrt01p.thalesgroup.com) (192.54.144.131) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 23 Apr 2012 08:20:22 +0000 Received: from thsbbfxrt01p.thalesgroup.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id E042959A41B for ; Mon, 23 Apr 2012 10:20:00 +0200 (CEST) From: DE VITO Dominique To: "user@cassandra.apache.org" Date: Mon, 23 Apr 2012 10:19:58 +0200 Subject: question about updates internal work in case of cache Thread-Topic: question about updates internal work in case of cache Thread-Index: Ac0gphO9vdxv+gzOSzafHSTX7/G0dAAgskwA Message-ID: <12032_1335169200_4F9510B0_12032_4431_1_AEE40020481AB74EAADC798FC2BC7C4A01B0AF3CE43C@THSONEA01CMS03P.one.grp> References: <3FFCCFCC-5394-4919-8A0B-D5302789B700@gmail.com> In-Reply-To: <3FFCCFCC-5394-4919-8A0B-D5302789B700@gmail.com> Accept-Language: fr-FR Content-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: fr-FR x-pmwin-version: 3.1.0.0, Antivirus-Engine: 3.30.0, Antivirus-Data: 4.76G Content-Type: multipart/alternative; boundary="_000_AEE40020481AB74EAADC798FC2BC7C4A01B0AF3CE43CTHSONEA01CM_" MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org --_000_AEE40020481AB74EAADC798FC2BC7C4A01B0AF3CE43CTHSONEA01CM_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, Let's suppose a column (name+value) is cached in memory, with timestamp T. 1) An update, for this column, arrives with exactly the *same* timestamp, a= nd the *same* value. Is the commitlog updated ? 2) An update, for this column, arrives with a timestamp < T. Is the commitlog updated ? Thanks for your help. Regards, Dominique --_000_AEE40020481AB74EAADC798FC2BC7C4A01B0AF3CE43CTHSONEA01CM_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi,

 

Let's suppose a column (name+value) is cached in memory, wit= h timestamp T.

 

1) An update, for this column, arrives with exactly the *sam= e* timestamp, and the *same* value.

Is the commitlog updated ?

 

2) An update, for this column, arrives with a timestamp <= T.

Is the commitlog updated ?

 

Thanks for your help.

 

Regards,

Dominique

 

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