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From "Sam Tunnicliffe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13851) Allow existing nodes to use all peers in shadow round
Date Fri, 15 Sep 2017 15:16:01 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16168008#comment-16168008
] 

Sam Tunnicliffe commented on CASSANDRA-13851:
---------------------------------------------

Seeds have a secondary purpose in gossip, to help shorten convergence time (though this is
a little contentious, see CASSANDRA-9206). 
If a node is restarted and cannot contact any seeds (especially if the configured seeds have
been removed from the cluster), it's probably a good thing that operators are aware of that.


> 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
>            Reporter: Kurt Greaves
>
> 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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