Return-Path: 
 <commits-return-16463-apmail-cassandra-commits-archive=cassandra.apache.org@cassandra.apache.org>
Delivered-To: apmail-cassandra-commits-archive@www.apache.org
Received: (qmail 8726 invoked from network); 26 Jul 2010 02:52:15 -0000
Received: from unknown (HELO mail.apache.org) (140.211.11.3)
  by 140.211.11.9 with SMTP; 26 Jul 2010 02:52:15 -0000
Received: (qmail 33656 invoked by uid 500); 26 Jul 2010 02:52:15 -0000
Delivered-To: apmail-cassandra-commits-archive@cassandra.apache.org
Received: (qmail 33628 invoked by uid 500); 26 Jul 2010 02:52:14 -0000
Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:commits-help@cassandra.apache.org>
List-Unsubscribe: <mailto:commits-unsubscribe@cassandra.apache.org>
List-Post: <mailto:commits@cassandra.apache.org>
List-Id: <commits.cassandra.apache.org>
Reply-To: dev@cassandra.apache.org
Delivered-To: mailing list commits@cassandra.apache.org
Received: (qmail 33620 invoked by uid 99); 26 Jul 2010 02:52:14 -0000
Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230)
    by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 26 Jul 2010 02:52:14 +0000
X-ASF-Spam-Status: No, hits=-1996.4 required=10.0
	tests=ALL_TRUSTED,FS_REPLICA
X-Spam-Check-By: apache.org
Received: from [140.211.11.22] (HELO thor.apache.org) (140.211.11.22)
    by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 26 Jul 2010 02:52:11 +0000
Received: from thor (localhost [127.0.0.1])
	by thor.apache.org (8.13.8+Sun/8.13.8) with ESMTP id o6Q2po53012962
	for <commits@cassandra.apache.org>; Mon, 26 Jul 2010 02:51:50 GMT
Message-ID: <23361220.577041280112709997.JavaMail.jira@thor>
Date: Sun, 25 Jul 2010 22:51:49 -0400 (EDT)
From: "Jonathan Ellis (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Subject: [jira] Commented: (CASSANDRA-1314) snitch that prefers a single
 replica for all reads to a given key
In-Reply-To: <19398011.563581279935771538.JavaMail.jira@thor>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394
X-Virus-Checked: Checked by ClamAV on apache.org


    [ https://issues.apache.org/jira/browse/CASSANDRA-1314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12892165#action_12892165 ] 

Jonathan Ellis commented on CASSANDRA-1314:
-------------------------------------------

this won't be effective w/o disabling readrepair.

in 0.6, <DoConsistencyChecksBoolean>false</DoConsistencyChecksBoolean> under
<Storage>

in 0.7, read_repair_chance=0

> snitch that prefers a single replica for all reads to a given key
> -----------------------------------------------------------------
>
>                 Key: CASSANDRA-1314
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1314
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.6.4
>
>         Attachments: StaticPreferenceSnitch.java
>
>
> motivation is, if you reduce or eliminate read repair (CASSANDRA-930) then you can cache about RF times as much data in memory, than if you're scattering reads across all the replicas equally.
> making this data-center aware would be a nice improvement, but i'm just targetting a single DC here.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.