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From "Stu Hood (JIRA)" <>
Subject [jira] Created: (CASSANDRA-1391) Allow Concurrent Schema Migrations
Date Fri, 13 Aug 2010 21:40:15 GMT
Allow Concurrent Schema Migrations

                 Key: CASSANDRA-1391
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Stu Hood

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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