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https://issues.apache.org/jira/browse/CASSANDRA-2715?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-2715:
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Attachment: 2715.txt
announce() becomes a direct "send this migration to the rest of the cluster."
DefinitionsAnnnounceVerbHandler goes away, and DefinitionsUpdateResponse
becomes DefinitionsUpdate.
> simplify schema reconciliation
> ------------------------------
>
> Key: CASSANDRA-2715
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2715
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.7.0
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 0.7.7, 0.8.1
>
> Attachments: 2715.txt
>
>
> Currently, schema migrations can be replayed from one node to another in any
> of three ways:
> - a node processes a migration from a client, and pushes it to all live nodes
> (Migration.announce on the source)
> - a node sees that another node's schema version is older than his
> (MigrationManager.onChange on the source)
> - a node sees that his own schema version is older than another's and makes
> an explicit request (MigrationManager.onChange on the target,
> DefinitionsAnnounceVerbHandler on the source)
> The last of these is an optimization that isn't worth the extra complexity --
> under normal conditions, the initial announce from the coordinator updates
> everyone, and in recovery situations the latency gain of #3 over #2 is only a
> few seconds.
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