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Piotr Kołaczkowski commented on CASSANDRA-6678: ----------------------------------------------- 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? -- This message was sent by Atlassian JIRA (v6.1.5#6160)