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https://issues.apache.org/jira/browse/CASSANDRA-13079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15794367#comment-15794367
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Vladimir Yudovin commented on CASSANDRA-13079:
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"Increased" should also include adding new DC (no matter existing or new) for
replication , even if current factor for other DC is decreased, so total sum if
unchanged or even decreased.
May be for simplicity we can reset repair state on any replication factor or
class change. It's not often operation, besides maybe system_auth, but it's
usually small keyspace.
> Repair doesn't work after several replication factor changes
> ------------------------------------------------------------
>
> Key: CASSANDRA-13079
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13079
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Debian
> Reporter: Vladimir Yudovin
> Priority: Critical
>
> Scenario:
> Start two nodes cluster.
> Create keyspace with rep.factor *one*:
> CREATE KEYSPACE rep WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 1};
> CREATE TABLE rep.data (str text PRIMARY KEY );
> INSERT INTO rep.data (str) VALUES ( 'qwerty');
> Run *nodetool flush* on all nodes. On one of them table files are created.
> Change replication factor to *two*:
> ALTER KEYSPACE rep WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 2};
> Run repair, then *nodetool flush* on all nodes. On all nodes table files are
> created.
> Change replication factor to *one*:
> ALTER KEYSPACE rep WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 1};
> Then *nodetool cleanup*, only on initial node remained data files.
> Change replication factor to *two* again:
> ALTER KEYSPACE rep WITH replication = {'class': 'SimpleStrategy',
> 'replication_factor': 2};
> Run repair, then *nodetool flush* on all nodes. No data files on second node
> (though expected, as after first repair/flush).
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