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