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The lock is created during page splitting after moving records and locks(lock_move_rec_list_(start|end)()) to the new page, and inheriting the locks to the supremum of left page from the successor of the infimum on right page. There is no need in such inheritance for READ COMMITTED isolation level and not-gap locks, so the fix is to add the corresponding condition in gap lock inheritance function. One more fix is to forbid gap lock inheritance if XA was prepared. Use the most significant bit of trx_t::n_ref to indicate that gap lock inheritance is forbidden. This fix is based on mysql/mysql-server@b063e52a83 |
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| lock0iter.cc | ||
| lock0lock.cc | ||
| lock0prdt.cc | ||
| lock0wait.cc | ||