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From "Vijay (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-952) DC Quorum broken @ trunk
Date Fri, 14 May 2010 18:00:44 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867601#action_12867601
] 

Vijay commented on CASSANDRA-952:
---------------------------------

Jeremy, 
For 002 i am submitting the update for the patch... Thanks!
replication strategy - Yes currently thats the case, but DSS can handle all the required levels
it will just forward the requests to AbstractReplicationStrategy if other than DCQuorum or
DCQuorumSync.

> 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, 0.8
>
>         Attachments: 0001-clean-out-callback-purging-from-truncate-writerh.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-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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