[jira] [Commented] (CASSANDRA-10243) Warn or fail when changing cluster topology live

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-10243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15394003#comment-15394003 ] 

Jonathan Ellis commented on CASSANDRA-10243:
--------------------------------------------

I edited cassandra.yaml as follows:

{code}
# CASSANDRA WILL NOT ALLOW YOU TO SWITCH TO AN INCOMPATIBLE SNITCH
# ONCE DATA IS INSERTED INTO THE CLUSTER.  This would cause data loss.
# This means that if you start with the default SimpleSnitch, which
# locates every node on "rack1" in "datacenter1", your only options
# if you need to add another datacenter are GossipingPropertyFileSnitch
# (and the older PFS).  From there, if you want to migrate to an
# incompatible snitch like Ec2Snitch you can do it by adding new nodes
# under Ec2Snitch (which will locate them in a new "datacenter") and
# decommissioning the old ones.
{code}

> Warn or fail when changing cluster topology live
> ------------------------------------------------
>
>                 Key: CASSANDRA-10243
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10243
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Stefania
>            Priority: Critical
>             Fix For: 2.1.12, 2.2.4, 3.0.1, 3.1, 3.2
>
>
> Moving a node from one rack to another in the snitch, while it is alive, is almost always the wrong thing to do.



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