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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-13851) Allow existing nodes to use all peers in shadow round
Date Tue, 17 Apr 2018 17:17:00 GMT

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

Sam Tunnicliffe updated CASSANDRA-13851:
----------------------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 3.11.x)
                       (was: 4.x)
                   3.11.3
                   4.0
           Status: Resolved  (was: Patch Available)

Thanks [~KurtG], latest CI (after rebases) looks good committed so I've to cassandra-3.11
in {{28ccf3fe3989d9d80063fe4d4bb048efe471936b}} and merged to trunk. 
I'll get the dtest committed directly.

> 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: 4.0, 3.11.3
>
>
> 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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