[CASSANDRA-19790] Add an ability to reconstruct arbitrary epoch state from the log to TCM

• Type: New Feature
• Status: Resolved
• Priority: High
• Resolution: Fixed
• Fix Version/s: 5.1
• Component/s: Transactional Cluster Metadata
• Change Category: Semantic
• Complexity: Normal
• Platform: All

Source Control Link

https://github.com/apache/cassandra/commit/b98954f0acb281101d42f76bad18a2051d114692

Test and Documentation Plan

includes a test

• Assignee: Alex Petrov
• Reporter: Alex Petrov

Authors

Alex Petrov

Reviewers

Marcus Eriksson, Sam Tunnicliffe

• Created: 22/Jul/24 16:12
• Updated: 04/Sep/24 16:28
• Resolved: 27/Aug/24 09:47

Description

Current Accord functionality requires TCM to be able to provide cluster metadata for an arbitrary epoch. Unfortunately, epochs are not always available locally especially on bootstrapping non-CMS nodes. For this, we need to reconstruct from the log.

Issue Links

• blocks: CASSANDRA-19769 CEP-15: (Accord) sequence EpochReady.coordinating to allow syncComplete to be learned from newer epochs
• links to: PR