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Date: Mon, 25 May 2015 14:54:17 +0000 (UTC)
From: "Marcus Olsson (JIRA)" <jira@apache.org>
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Subject: [jira] [Created] (CASSANDRA-9474) DC/Rack property changed on live
 system
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Marcus Olsson created CASSANDRA-9474:
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             Summary: 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


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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