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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-952) DC Quorum broken @ trunk
Date Tue, 18 May 2010 13:33:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868642#action_12868642
] 

Hudson commented on CASSANDRA-952:
----------------------------------

Integrated in Cassandra #439 (See [http://hudson.zones.apache.org/hudson/job/Cassandra/439/])
    make DCQUORUM CLs actually wait for the nodes per DC rather than attempting a purely count-based
approach that didn't really work as advertised.  patch by Vijay Parthasarathy and jbellis;
reviewed by Jeremy Hanna for CASSANDRA-952


> DC Quorum broken @ trunk
> ------------------------
>
>                 Key: CASSANDRA-952
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-952
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.6
>         Environment: Linux, Cassandra
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 0.7
>
>         Attachments: 0001-clean-out-callback-purging-from-truncate-writerh.txt, 0002-dcquorum-fixes-v2.txt,
0002-dcquorum-fixes.txt, 952-Canges_To_Stategy_V002.txt, 952-Change_BlockFor.txt, 952-Changes_To_ResponseHandler_v002.txt,
952-Fix_Refactor_DCStatergy.txt, 952-v3.txt, 952-v3.txt, 952-v4.txt, 952-v4.txt, 952-v5.txt,
DC-Config.xml
>
>
> Currently DCQuorum is broken in trunk, Suggesting the following fix... 
> Write to DC's
> 1) Move determineBlockFor(int expandedTargets, ConsistencyLevel consistency_level) to
AbstractEndpointSnitch
> 2) Add the same to support DC Quorum in DatacenterShardStategy
> Read to DC's
> 1) find suitable nodes was a list which was returning a list of local DC's earlier but
now it is just one node and MD is been sent by other nodes. Need to have an option to even
avoid MD from other DC's?

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