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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