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From "Cyril Scetbon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6852) can't repair -pr part of data when not replicating data everywhere (multiDCs)
Date Thu, 13 Mar 2014 16:11:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13933466#comment-13933466
] 

Cyril Scetbon commented on CASSANDRA-6852:
------------------------------------------

I don't think the original JIRA can really help me :(
I understand that you chose to not repair -pr on a node not storing data for one keyspace.
However here is my problem or show me I'm wrong: http://pastebin.com/VrDnWvAu

So the incriminated node owns 10.1% of the tokens which seem to be responsible for rows in
keyspace ks1. However as ks1 is not replicated to that node, how can I repair it without a
FULL REPAIR on all nodes ? 

At the beginning I thought like [~jjordan] when I read his [comment|https://issues.apache.org/jira/browse/CASSANDRA-5424?focusedCommentId=13673260&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13673260].
However I can see that tokens on the incriminated node (not replicating data for ks1) is referring
rows ... I suppose it's what we call primary ranges and if not why do I find ks1's data for
those tokens ? 

> can't repair -pr part of data when not replicating data everywhere (multiDCs)
> -----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-6852
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6852
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Cyril Scetbon
>              Labels: multi-dcs, ranges, repair
>
> Our environment is as follows :
> - 3 DCS : dc1,dc2 and dc3
> - replicate all keyspaces to dc1 and dc2
> - replicate a few keyspaces to dc3 as we have less hardware and use it for computing
statistics
> We use repair -pr everywhere regularly. FYI, a full repair takes almost 20 hours per
node. The matter is that we can't use "repair -pr" anymore for tokens stored on dc3 concerning
keyspaces not replicated. We should have a way to repair those ranges without doing a FULL
REPAIR everywhere



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