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From "Stefania (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-10243) Warn or fail when changing cluster topology live
Date Tue, 10 Nov 2015 09:57:11 GMT


Stefania commented on CASSANDRA-10243:

So far I've done {{GossipingPropertyFileSnitch}} and {{PropertyFileSnith}} in 2.1. Here is
what the error looks like:

ERROR 09:51:55 Cannot update data center or rack from [DC1, RAC1] to [DC2, RAC2] for live
host /, property file NOT RELOADED

cc [~jbellis] and [~tjake] regarding the two questions above and summarized here:

* Should we enhance the deprecated snitch {{YamlFileNetworkTopologySnitch}} which is available
in 2.1 only
* Should we  allow a node to join the cluster when the rack changes on startup 

> Warn or fail when changing cluster topology live
> ------------------------------------------------
>                 Key: CASSANDRA-10243
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jonathan Ellis
>            Assignee: Stefania
>            Priority: Critical
>             Fix For: 2.1.x
> 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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