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When the btr_search_latch was split into an array of latches in MySQL 5.7.8 as part of the Oracle Bug#20985298 fix, the "caching" of the latch across storage engine API calls was removed, and the field trx->has_search_latch would only be set during a short time frame in the execution of row_search_mvcc(), which was formerly called row_search_for_mysql(). This means that the column INFORMATION_SCHEMA.INNODB_TRX.TRX_ADAPTIVE_HASH_LATCHED will always report 0. That column cannot be removed in MariaDB 10.2, but it can be removed in future releases. trx_t::has_search_latch: Remove. trx_assert_no_search_latch(): Remove. row_sel_try_search_shortcut_for_mysql(): Remove a redundant condition on trx->has_search_latch (it was always true). sync_check_iterate(): Make the parameter const. sync_check_functor_t: Make the operator() const, and remove result() and the virtual destructor. There is no need to have mutable state in the functors. sync_checker<bool>: Replaces dict_sync_check and btrsea_sync_check. sync_check: Replaces btrsea_sync_check. dict_sync_check: Instantiated from sync_checker. sync_allowed_latches: Use std::find() directly on the array. Remove the std::vector. TrxInInnoDB::enter(), TrxInInnoDB::exit(): Remove obviously redundant debug assertions on trx->in_depth, and use equality comparison against 0 because it could be more efficient on some architectures. |
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| sync0arr.cc | ||
| sync0debug.cc | ||
| sync0rw.cc | ||
| sync0sync.cc | ||