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From "Sam Overton (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4127) migration support for vnodes
Date Thu, 05 Apr 2012 14:54:24 GMT
migration support for vnodes
----------------------------

                 Key: CASSANDRA-4127
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4127
             Project: Cassandra
          Issue Type: Sub-task
            Reporter: Sam Overton
            Assignee: Sam Overton


If, when starting up for the first time, the host only has 1 token but num_tokens is configured
differently, then this will trigger a migration process:
* The host will assign itself num_tokens tokens in its own range
* The new tokens will be gossiped

This will allow a rolling migration where N new hosts are bootstrapped into the cluster (with
num_tokens set appropriately) and then the N old nodes are decommissioned. This will result
in even distribution of the data among the new nodes with randomly assigned tokens.

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