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Major compaction already flushes each table to make sure it considers any mutations that are present in the memtable for the purpose of tombstone purging. See64ec1c6ec6However, tombstone purging may be inhibited by data in commitlog segments based on `gc_time_min` in the `tombstone_gc_state` (Seef42eb4d1ce). Flushing all sstables in the database release all references to commitlog segments and there it maximizes the potential for tombstone purging, which is typically the reason for running major compaction. However, flushing all tables too frequently might result in tiny sstables. Since when flushing all keyspaces using `nodetool flush` the `force_keyspace_compaction` api is invoked for keyspace successively, we need a mechanism to prevent too frequent flushes by major compaction. Hence a `compaction_flush_all_tables_before_major_seconds` interval configuration option is added (defaults to 24 hours). In the case that not all tables are flushed prior to major compaction, we revert to the old behavior of flushing each table in the keyspace before major-compacting it. Fixes scylladb/scylladb#15777 Signed-off-by: Benny Halevy <bhalevy@scylladb.com>