[
https://issues.apache.org/jira/browse/CASSANDRA-9474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Marcus Olsson updated CASSANDRA-9474:
-------------------------------------
Attachment: cassandra-2.1-dc_rack_healthcheck.patch
cassandra-2.1-9474.patch
Attaching two patches, one that removes the auto-reload feature of GPFS and one
that adds a health check at startup that checks so that the local dc/rack
settings haven't changed.
The patch with the health check also has a system property named
cassandra.override_rackdc that makes it possible to change the dc/rack directly
without clearing the local data(for test environments?)
> 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
>
> Attachments: cassandra-2.1-9474.patch,
> cassandra-2.1-dc_rack_healthcheck.patch
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
