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https://issues.apache.org/jira/browse/CASSANDRA-9474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14560563#comment-14560563
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Marcus Olsson commented on CASSANDRA-9474:
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Yes, that's true, but for e.g. PropertyFileSnitch this could have some other
benefits like getting the DC/rack information for new nodes. One thing that's
good about the reloading is that you get some kind of negative response almost
directly after changing the configuration, which I think is better than getting
it whenever that Cassandra instance is restarted since that would be harder to
trace back to the faulty configuration. Or better yet, to have DC and rack
configuration be a part of the sanity check at startup, which would make
switching DC/rack information harder, but still not impossible(update
system.local).
> DC/Rack property changed on live system
> ---------------------------------------
>
> Key: CASSANDRA-9474
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9474
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra 2.1.5
> Reporter: Marcus Olsson
> Fix For: 2.1.x
>
>
> When using GossipingPropertyFileSnitch it is possible to change the data
> center and rack of a live node by changing the cassandra-rackdc.properties
> file. Should this really be possible? In the documentation at
> http://docs.datastax.com/en/cassandra/2.1/cassandra/initialize/initializeMultipleDS.html
> it's stated that you should ??Choose the name carefully; renaming a data
> center is not possible??, but with this functionality it doesn't seem
> impossible(maybe a bit hard with changing replication etc.).
> This functionality was introduced by CASSANDRA-5897 so I'm guessing there is
> some use case for this?
> Personally I would want the DC/rack settings to be as restricted as the
> cluster name, otherwise if a node could just join another data center without
> removing it's local information couldn't it mess up the token ranges? And
> suddenly the old data center/rack would loose 1 replica of all the data that
> the node contains.
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