[jira] [Updated] (CASSANDRA-3047) implementations of IPartitioner.describeOwnership() are not DC aware

["David Alves (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-3047?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Alves updated CASSANDRA-3047:
-----------------------------------

    Attachment: CASSANDRA-3047.patch

patch that does the following:

- separates output per dc and correctly calculates ring ownership
- list replicas per dc
- adds a unit test to assert that calculations are correctly performed
                
> implementations of IPartitioner.describeOwnership() are not DC aware
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-3047
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3047
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Aaron Morton
>            Assignee: David Alves
>            Priority: Trivial
>             Fix For: 1.1.2
>
>         Attachments: CASSANDRA-3047.patch
>
>
> see http://www.mail-archive.com/user@cassandra.apache.org/msg16375.html
> When a cluster the multiple rings approach to tokens the output from nodetool ring is incorrect.
> When it uses the interleaved token approach (e.g. dc1, dc2, dc1, dc2) it will be correct. 
> It's a bit hacky but could we special case (RP) tokens that are off by 1 and calculate the ownership per dc ? I guess another approach would be to add some parameters so the partitioner can be told about the token assignment strategy.  

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