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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1391) Allow Concurrent Schema Migrations
Date Mon, 22 Aug 2011 15:41:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13088771#comment-13088771
] 

Jonathan Ellis commented on CASSANDRA-1391:
-------------------------------------------

I'd prefer "Schema" to DBSchema, and "Schema.instance" to a static final DBD.schema reference
(and inlining the DBD.getX calls that just wrap a Schema method of the same name).

Otherwise +1

> Allow Concurrent Schema Migrations
> ----------------------------------
>
>                 Key: CASSANDRA-1391
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1391
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Stu Hood
>            Assignee: Pavel Yaskevich
>             Fix For: 1.0
>
>         Attachments: 0001-CASSANDRA-1391-refactoring-of-the-DatabaseDescriptor.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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