Kurt Greaves commented on CASSANDRA-13851:

[~beobal] have you had a chance to review the latest? I've rebased both dtests 
and patch and also uploaded a branch for trunk (now that it no longer merges).

> Allow existing nodes to use all peers in shadow round
> -----------------------------------------------------
>                 Key: CASSANDRA-13851
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13851
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Lifecycle
>            Reporter: Kurt Greaves
>            Assignee: Kurt Greaves
>            Priority: Major
>             Fix For: 3.11.x, 4.x
> In CASSANDRA-10134 we made collision checks necessary on every startup. A 
> side-effect was introduced that then requires a nodes seeds to be contacted 
> on every startup. Prior to this change an existing node could start up 
> regardless whether it could contact a seed node or not (because 
> checkForEndpointCollision() was only called for bootstrapping nodes). 
> Now if a nodes seeds are removed/deleted/fail it will no longer be able to 
> start up until live seeds are configured (or itself is made a seed), even 
> though it already knows about the rest of the ring. This is inconvenient for 
> operators and has the potential to cause some nasty surprises and increase 
> downtime.
> One solution would be to use all a nodes existing peers as seeds in the 
> shadow round. Not a Gossip guru though so not sure of implications.

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