[jira] [Created] (CASSANDRA-20142) Fix topology replay during bootstrap and startup, decouple Accord from TCM

["Alex Petrov (Jira)" <ji...@apache.org>]

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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