Joseph Lynch commented on CASSANDRA-15224:

This is at least fixed in the trunk patch for CASSANDRA-14459. I may be able to 
isolate those changes for backport to the 3.x series.

> DynamicSnitch.applyConfigChanges can corrupt snitch state
> ---------------------------------------------------------
>                 Key: CASSANDRA-15224
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15224
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local/Other
>            Reporter: Benedict
>            Priority: Normal
>             Fix For: 3.0.x, 3.11.x, 4.0.x
> This method is not synchronised, and doesn’t wait for the cancelled task to 
> complete (which could already be running), so we could have two updates in 
> flight simultaneously and corrupt the internal state of the collection

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