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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2662) Nodes get ignored by dynamic snitch when read repair chance is zero
Date Fri, 29 Jul 2011 00:26:09 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13072619#comment-13072619
] 

Hudson commented on CASSANDRA-2662:
-----------------------------------

Integrated in Cassandra-0.7 #537 (See [https://builds.apache.org/job/Cassandra-0.7/537/])
    DES shouldn't ignore nodes when the read repair chance is zero.
Patch by brandonwilliams reviewed by Paul Cannon for CASSANDRA-2662

brandonwilliams : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1152038
Files : 
* /cassandra/branches/cassandra-0.7/src/java/org/apache/cassandra/locator/DynamicEndpointSnitch.java


> Nodes get ignored by dynamic snitch when read repair chance is zero
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-2662
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2662
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.6.5
>            Reporter: Daniel Doubleday
>            Assignee: Brandon Williams
>            Priority: Trivial
>             Fix For: 0.7.9, 0.8.3
>
>         Attachments: 2662.txt, dynsnitch.patch
>
>
> DynamicEndpointSnitch falls back to subsnitch when one of the scores of the endpoints
being compared is missing.
> This leads to a stable order of hosts until reads will lead to recorded scores. 
> If setting read repair chance to 0 and reads are performed with quorum then (rf - # quorum
nodes) will never get reads.

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