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https://issues.apache.org/jira/browse/CASSANDRA-6852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939495#comment-13939495
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Cyril Scetbon edited comment on CASSANDRA-6852 at 3/18/14 5:17 PM:
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No, I just want to understand the way it works as opposed to the way I thought
it was working. If you can explain it with simplicity :)
As tokens are spread before knowing what keyspaces will be created, when a hash
value is calculated for a key to know which token will be used what cassandra
does to be sure it won't be pushed to a node where it should not (where the
keyspace concerned is not replicated) ?
was (Author: cscetbon):
No, I just want to understand the way it works as opposed to the way I thought
it was working. If you can explain it with simplicity :)
As tokens are spread before knowing what keyspaces will be created, when a hash
value is calculated for a key to know which token will be used what cassandra
does to be sure it won't be pushed to a node where it should not (where the
keyspace concerned is not replicated)
> 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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