ifesdjeen opened a new pull request, #3781:
URL: https://github.com/apache/cassandra/pull/3781
Fix topology replay during bootstrap and startup, decouple Accord from TCM
Includes multiple changes, primary ones:
* Make HarrySimulatorTest work with Accord
* Removed nodes now live in TCM, no need to discover historic epochs in
order to find removed nodes
* CommandStore <-> RangesForEpochs mappings required for startup are now
stored in journal, and CS can be set up _without_ topology replay
* Topology replay is fully done via journal (where we store topologies
themselves), and topology metadata table (where we store redundant/closed
information)
* Fixed various bugs related to propagation and staleness
* TCM was previously relied on for "fetching" epoch: we can not rely on
it as there's no guarantee we will see a consecutive epoch when grabbing
Metadata#current
* Redundant / closed during replay was set with incorrect ranges in 1
of the code paths
* TCM was contacted multiple times for historical epochs, which made
startup much longer under some circumstances
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