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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7450) Make repair -pr work within a datacenter
Date Sun, 14 Sep 2014 00:01:48 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7450?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Paulo Motta updated CASSANDRA-7450:
-----------------------------------
    Attachment: 2.1-CASSANDRA-7450-v2.txt

V2 version of the patch attached with the proposed changes and tests.

Is backport to 2.0 needed or it's mergeable with 2.0? I will provide the backport to 1.2,
since this might be an important feature to many 1.2 users without risking existing functionality.

> Make repair -pr work within a datacenter
> ----------------------------------------
>
>                 Key: CASSANDRA-7450
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7450
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Sylvain Lebresne
>            Assignee: Paulo Motta
>              Labels: bootcamp, repair
>             Fix For: 2.1.1
>
>         Attachments: 2.1-CASSANDRA-7450-v1.txt, 2.1-CASSANDRA-7450-v2.txt
>
>
> As was noticed in CASSANDRA-7317, using '-pr' alongside '-local' for repair doesn't really
work properly, and disabling the combination was definitively the right short time fix. However,
the main goal of '-pr' is to make it easy to repair a full cluster without doing any duplication
of work. Doing the same only within a data-center is obviously desirable.
> I think a reasonably simple solution would be modify the behavior of '-pr' when it's
limited to only one DC. If applied to nodeX in dcY, instead of repairing only the "primary"
range of nodeX for the whole ring, we'll repair that range but also all ranges that are "primary"
for a node not in dcY and for which nodeX is the first node of dcY found in ring order. Basically
we'll ensure that running 'repair -local -pr' on every nodes of a given DC will repair all
ranges for the nodes of that DC without repairing the same range twice.



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