Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@cassandra.apache.org
Date: Thu, 13 Mar 2014 03:23:43 +0000 (UTC)
From: "Ryan McGuire (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.12696354.1392929997746.57158.1394681023260@arcas>
In-Reply-To: <JIRA.12696354.1392929997746@arcas>
References: <JIRA.12696354.1392929997746@arcas>
Subject: [jira] [Comment Edited] (CASSANDRA-6746) Reads have a slow ramp up
 in speed
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/CASSANDRA-6746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13932834#comment-13932834 ] 

Ryan McGuire edited comment on CASSANDRA-6746 at 3/13/14 3:22 AM:
------------------------------------------------------------------

For the record, this patch resolved the situation for this specific test at least.

!6746-patched.png!

orange line is cassandra-2.1 HEAD with the patch from this ticket.

[data available here|http://ryanmcguire.info/ds/graphV2/graph.html?stats=stats.6746.patch.json&metric=op_rate&operation=read&smoothing=1]


was (Author: enigmacurry):
For the record, this patch resolved the situation for this specific test at least.

!6746-patched.png!

[data available here|http://ryanmcguire.info/ds/graphV2/graph.html?stats=stats.6746.patch.json&metric=op_rate&operation=read&smoothing=1]

> Reads have a slow ramp up in speed
> ----------------------------------
>
>                 Key: CASSANDRA-6746
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6746
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Ryan McGuire
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 2.1 beta2
>
>         Attachments: 2.1_vs_2.0_read.png, 6746-patched.png, 6746.txt, cassandra-2.0-bdplab-trial-fincore.tar.bz2, cassandra-2.1-bdplab-trial-fincore.tar.bz2
>
>
> On a physical four node cluister I am doing a big write and then a big read. The read takes a long time to ramp up to respectable speeds.
> !2.1_vs_2.0_read.png!
> [See data here|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.2.1_vs_2.0_vs_1.2.retry1.json&metric=interval_op_rate&operation=stress-read&smoothing=1]


--
This message was sent by Atlassian JIRA
(v6.2#6252)