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From "Kurt Greaves (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13851) Allow existing nodes to use all peers in shadow round
Date Wed, 17 Jan 2018 02:06:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16328152#comment-16328152
] 

Kurt Greaves commented on CASSANDRA-13851:
------------------------------------------

|[dtest|https://github.com/apache/cassandra-dtest/compare/master...kgreav:13851]|[3.11|https://github.com/apache/cassandra/compare/cassandra-3.11...kgreav:3.11-13851]|[utests|https://circleci.com/gh/kgreav/cassandra/54]|

Added another quick dtest to make sure that if a non-seed starts it will still join as long
as the seed is started within {{RING_DELAY * 2}}.

> 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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