Peter Schuller reported an important bug in https://issues.apache.org/jira/browse/CASSANDRA-2435:
"On one of our clusters with 5 nodes, we did some moves. All looked well; the moves completed. For unrelated reasons, we wanted to restart nodes after they had been moved. When we did, three of the 5, specifically those 3 that were NOT seed nodes, initiated a bootstrap procedure! The logs indicated the automatic token selection, and they joined the ring under a new automatically selected token." We're reviewing a fix now for 0.7.5 (this does not affect 0.6 releases); in the meantime, you should make sure to re-set autobootstrap=false before running any move commands. Note that this will not cause data loss unless you run cleanup after the move; the fix is to run another move command, back to the old token. -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com