Sam Tunnicliffe created CASSANDRA-21036:
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Summary: Better support for CMS initialization when DOWN nodes
have not been upgraded
Key: CASSANDRA-21036
URL: https://issues.apache.org/jira/browse/CASSANDRA-21036
Project: Apache Cassandra
Issue Type: Improvement
Components: Transactional Cluster Metadata
Reporter: Sam Tunnicliffe
The {{nodetool cms initialize}} command allows the operator to supply a list of
nodes to ignore when checking for consensus on the initial state of cluster
metadata. If the ignored nodes have been upgraded and have begun startup prior
to this point, then the rest of the cluster will view them as upgraded and
everything proceeds as expected. However, if an ignored node has been DOWN for
the entirety of the upgrade, peers still consider the cluster to be in a mixed
state. This has an effect on the metadata serialization version that is
selected as well as on which metadata transformations are permitted. It must be
possible for the participating nodes to commit both the {{PreInitialize}} and
{{Initialize}} transformations in order for the CMS initialization to complete.
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