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https://issues.apache.org/jira/browse/CASSANDRA-21582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18105489#comment-18105489
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Marcus Eriksson commented on CASSANDRA-21582:
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Attached patch encodes the placement deltas in the multi step operations using
node ids instead, and translates the node ids to endpoints when applying them.
This is done since placements are still endpoint-based. Most of the complexity
in the patch is due to supporting upgrades while having ongoing
endpoint-encoded MSOs.
During a rolling upgrade the metadata serialization version is bumped when the
last node in the cluster is upgraded. For V8 -> V9 (6.0-alpha2 -> 6.0-alpha4)
upgrades this is now blocked if there are ongoing multi step operations, to
make sure we don't mix endpoint-deltas and nodeid-deltas. The operator has to
either let the MSO finish or abort it before upgrading the last node.
> MultiStepOperations should not encode range movements using endpoints
> ---------------------------------------------------------------------
>
> Key: CASSANDRA-21582
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21582
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Transactional Cluster Metadata
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Priority: Normal
> Time Spent: 10m
> Remaining Estimate: 0h
>
> MultiStepOperations like move, decommission etc encode range movements using
> endpoints. This blocks any IP changes while there is an ongoing MSO.
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