mariadb/mysql-test/suite/innodb/t/alter_large_dml.opt

--innodb_fatal_semaphore_wait_threshold=20
--innodb_online_alter_log_max_size=536870912
MDEV-15641 InnoDB crash while committing table-rebuilding ALTER TABLE Problem: ======== There is a possibility that there can be more concurrent DMLs While the alter table thread is waiting for upgrading to MDL_EXCLUSIVE before commit phase. In commit phase, InnoDB acquires dict_operation_lock and it already holds MDL_EXCLUSIVE on the table. After that, InnoDB applies the concurrent DML logs in commit phase. This could lead to blocking of the following things: 1) DML on the particular table (due to MDL_EXCLUSIVE on the table) 2) InnoDB DDLs (due to dict_operation_lock) 3) Purge thread, stats thread, the master thread (due to dict_operation_lock) Fix: ==== Apply the concurrent DML logs in commit phase but before acquiring dict_operation_lock in commit phase. It makes sure that (2), (3) can't be blocked for longer time. 2019-07-10 12:37:48 +05:30			`--innodb_fatal_semaphore_wait_threshold=20`
			`--innodb_online_alter_log_max_size=536870912`