Alex Petrov created CASSANDRA-20142:
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Summary: Fix topology replay during bootstrap and startup,
decouple Accord from TCM
Key: CASSANDRA-20142
URL: https://issues.apache.org/jira/browse/CASSANDRA-20142
Project: Apache Cassandra
Issue Type: Bug
Reporter: Alex Petrov
Assignee: Alex Petrov
Includes multiple changes, primary ones:
* 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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