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https://issues.apache.org/jira/browse/CASSANDRA-6678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Kołaczkowski updated CASSANDRA-6678:
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Comment: was deleted
(was: For upgrade to work, do I need to patch 1.2? Or is it enough to patch
2.0?)
> 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
> Assignee: Sergio Bossa
> Fix For: 1.2.16, 2.0.6
>
> Attachments: CASSANDRA-6678-1_2.patch, CASSANDRA-6678-2_0.patch
>
>
> 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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