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Date: Thu, 14 Dec 2017 09:03:01 +0000 (UTC)
From: "Sam Tunnicliffe (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Updated] (CASSANDRA-13851) Allow existing nodes to use all
 peers in shadow round
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archived-at: Thu, 14 Dec 2017 09:32:05 -0000


     [ https://issues.apache.org/jira/browse/CASSANDRA-13851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sam Tunnicliffe updated CASSANDRA-13851:
----------------------------------------
    Reviewer: Sam Tunnicliffe  (was: Jason Brown)

> 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
>             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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