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https://issues.apache.org/jira/browse/CASSANDRA-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13148656#comment-13148656
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T Jake Luciani commented on CASSANDRA-1391:
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I think the patch is a good start but I do like Jonathans idea of moving to
native CFs too.
We just want to make sure this gets into 1.1 since it's a problem a lot of
people run into.
Regarding the current impl, my concern is missing fields added to migration
structs over time. like we had happen a lot in CFMetaData conversion code.
Could you add a test verifies all migration struct fields are accounted for in
the merge logic? so if someone adds a new field and doesn't update the
migration merge logic it would cause this test to fail
> Allow Concurrent Schema Migrations
> ----------------------------------
>
> Key: CASSANDRA-1391
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1391
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.7.0
> Reporter: Stu Hood
> Assignee: Pavel Yaskevich
> Fix For: 1.1
>
> Attachments: CASSANDRA-1391.patch
>
>
> CASSANDRA-1292 fixed multiple migrations started from the same node to
> properly queue themselves, but it is still possible for migrations initiated
> on different nodes to conflict and leave the cluster in a bad state. Since
> the system_add/drop/rename methods are accessible directly from the client
> API, they should be completely safe for concurrent use.
> It should be possible to allow for most types of concurrent migrations by
> converting the UUID schema ID into a VersionVectorClock (as provided by
> CASSANDRA-580).
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