mck created CASSANDRA-14679:
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Summary: Prevent generating new tokens on a node when data exists
Key: CASSANDRA-14679
URL: https://issues.apache.org/jira/browse/CASSANDRA-14679
Project: Cassandra
Issue Type: Bug
Reporter: mck
Data loss is possible if a node starts up without {{system.local}} data
available.
If a node restarts and its {{system.local}} data is unavailable it will
generate new tokens. This will cause range movements in the cluster causing
potential data loss, and these range movements are not part of a
bootstrap/decommission and leaves orphaned data around the cluster.
This can happen if a node restarts without a JBOD entry available, or if the
cassandra.yaml changes and leaves a JBOD entry out.
If a node starts up, finds data but not its {{system.local}} it should not
generate new tokens. Neither should it assign itself a new Host ID.
This is described in more detail in
http://thelastpickle.com/blog/2018/08/22/the-fine-print-when-using-multiple-data-directories.html
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