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Posted to commits@cassandra.apache.org by "Brandon Williams (JIRA)" <ji...@apache.org> on 2014/02/07 14:49:20 UTC
[jira] [Commented] (CASSANDRA-6678) Unwanted schema pull while
upgrading nodes from 1.2 to 2.0
[ https://issues.apache.org/jira/browse/CASSANDRA-6678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894532#comment-13894532 ]
Brandon Williams commented on CASSANDRA-6678:
---------------------------------------------
Perhaps a MessagingService.knowsVersion check is what we need.
> Unwanted schema pull while upgrading nodes from 1.2 to 2.0
> ----------------------------------------------------------
>
> Key: CASSANDRA-6678
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6678
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Sergio Bossa
>
> While upgrading from 1.2 to 2.0, the 1.2 nodes are not supposed to pull schemas from upgraded 2.0 nodes to avoid conflicts.
> This relies on network version checks between the two nodes, but there's a bit of a race between the Gossiper, which is activated first, and the MessagingService, which is activated after the Gossiper and handles network version exchange: if a 1.2 node Gossiper gets a gossip message from a newly 2.0 node *before* opening connections from the MessagingService, the version will still be 1.2, and the schema will be pulled from the new node.
> A possible solution may be to have the Gossiper update the network version upon receiving the first gossip message of an upgraded node: thoughts?
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