Marcus Eriksson created CASSANDRA-19189:
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Summary: Revisit use of sealed period lookup tables
Key: CASSANDRA-19189
URL: https://issues.apache.org/jira/browse/CASSANDRA-19189
Project: Cassandra
Issue Type: Improvement
Components: Transactional Cluster Metadata
Reporter: Marcus Eriksson
Metadata snapshots are stored locally in the {{system.metadata_snapshots}}
table, which is keyed by epoch. Snapshots are retrieved from this table for two
purposes:* to replay locally during startup* to provide log state for a peer
requesting catchupIn the majority of cases, we always want to replay from the
most recent snapshot so we can usually select the appropriate snapshot by
simply scanning the snapshots table in reverse, which allows us to considerably
simplify the process of looking up the desired snapshot. We will continue to
persist historical snapshots, at least for now, so that we are able to select
arbitrary snapshots should we want to reconstruct metadata state for arbitrary
epochs.
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