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  1. MariaDB Server
  2. MDEV-20612

Improve InnoDB lock_sys scalability

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    Description

      lock_sys is one of three major InnoDB scalability bottlenecks. Scalability issues are especially obvious under sysbench OLTP update index/non-index benchmarks.

      There's no clarity on how exactly it should be optimised yet.

      Attachments

        Issue Links

          blocks

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21452 Use condition variables and normal mutexes instead of InnoDB os_event and mutex

          • Major - Major loss of function.
          • Closed
          causes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24861 Assertion `trx->rsegs.m_redo.rseg' failed in innodb_prepare_commit_versioned

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-35708 lock_rec_get_prev() returns only the first record lock

          • Major - Major loss of function.
          • Closed
          includes

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24731 Excessive mutex contention in DeadlockChecker::check_and_resolve()

          • Major - Major loss of function.
          • Closed
          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24671 Assertion failure in lock_wait_table_reserve_slot()

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed
          relates to

          Task - A task that needs to be done. MDEV-11392 AliSQL: [perf] Issue#31 OPTIMIZE CHECK/GRANT OF INNODB TABLE LOCK

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-16406 Refactor the InnoDB record locks

          • Major - Major loss of function.
          • Open

          Task - A task that needs to be done. MDEV-24813 Locking full table scan fails to use table-level locking

          • Critical - Crashes, loss of data, severe memory leak.
          • Approved

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24948 thd_need_wait_reports() hurts performance

          • Critical - Crashes, loss of data, severe memory leak.
          • In Review

          Task - A task that needs to be done. MDEV-24952 Simplify the locking and access of lock hash tables

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-26476 InnoDB is missing futex support on some platforms

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-40128 lock_move_reorganize_page() takes exclusive lock_sys.latch via LockMutexGuard

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-40129 lock_release_try() / lock_release_on_prepare_try() may fail due to transients

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-18706 ER_LOCK_DEADLOCK on concurrent read and insert into already locked gap

          • Major - Major loss of function.
          • Stalled

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21175 Remove dict_table_t::n_foreign_key_checks_running from InnoDB

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24915 Galera conflict resolution is unnecessarily complex

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-25010 Assertion `!lock_sys_t::get_first(receiver_cell, receiver_id, receiver_heap_no)' failed in lock_rec_move

          • Major - Major loss of function.
          • Closed
          links to

          Web Link WL#10314: InnoDB: Lock-sys optimization: sharded lock_sys mutex

          Activity

            People

              marko Marko Mäkelä
              svoj Sergey Vojtovich
              Votes:
              2 Vote for this issue
              Watchers:
              12 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved:

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