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acd2862e65
While the redo log format was changed in MariaDB 10.3.2 and 10.3.3 due to MDEV-12288 and MDEV-11369, it should be technically possible to upgrade from a crashed MariaDB 10.2 instance. On a related note, it should be possible for Mariabackup 10.3 to create a backup from a running MariaDB Server 10.2. mlog_id_t: Put back the 10.2 specific redo log record types MLOG_UNDO_INSERT, MLOG_UNDO_ERASE_END, MLOG_UNDO_INIT, MLOG_UNDO_HDR_REUSE. trx_undo_parse_add_undo_rec(): Parse or apply MLOG_UNDO_INSERT. trx_undo_erase_page_end(): Apply MLOG_UNDO_ERASE_END. trx_undo_parse_page_init(): Parse or apply MLOG_UNDO_INIT. trx_undo_parse_page_header_reuse(): Parse or apply MLOG_UNDO_HDR_REUSE. recv_log_recover_10_2(): Remove. Always parse the redo log from 10.2. recv_find_max_checkpoint(), recv_recovery_from_checkpoint_start(): Always parse the redo log from MariaDB 10.2. recv_parse_or_apply_log_rec_body(): Parse or apply MLOG_UNDO_INSERT, MLOG_UNDO_ERASE_END, MLOG_UNDO_INIT. srv_prepare_to_delete_redo_log_files(), innobase_start_or_create_for_mysql(): Upgrade from a previous (supported) redo log format.