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4c8dba15f1
This patch fixes 2 issues within strong consistency state machine: - it might happen that apply is called before the schema is delivered to the node - on the other hand, the apply may be called after the schema was changed and purged from the schema registry The first problem is fixed by doing `group0.read_barrier()` before applying the mutations. The second one is solved by upgrading the mutations using column mappings in case the version of the mutations' schema is older. Fixes SCYLLADB-428 Strong consistency is in experimental phase, no need to backport. Closes scylladb/scylladb#28546 * https://github.com/scylladb/scylladb: test/cluster/test_strong_consistency: add reproducer for old schema during apply test/cluster/test_strong_consistency: add reproducer for missing schema during apply test/cluster/test_strong_consistency: extract common function raft_group_registry: allow to drop append entries requests for specific raft group strong_consistency/state_machine: find and hold schemas of applying mutations strong_consistency/state_machine: pull necessary dependencies db/schema_tables: add `get_column_mapping_if_exists()`