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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. |
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