Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-20852

BtrBulk is unnecessarily holding dict_index_t::lock

    Details

      Description

      The BtrBulk class, which was introduced in MySQL 5.7, is by design the exclusive writer to an index. It is therefore unnecessary to acquire the dict_index_t::lock in that code.

      Holding the dict_index_t::lock would unnecessarily block other threads (SQL connections and the InnoDB purge threads) from buffering concurrent modifications to being-created secondary indexes.

      This was addressed in MySQL 5.7.28 with a change that is still unnecessarily acquiring the dict_index_t::lock in some cases:
      Bug #29008298 MYSQLD CRASHES ITSELF WHEN CREATING INDEX

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                marko Marko Mäkelä
                Reporter:
                marko Marko Mäkelä
              • Votes:
                0 Vote for this issue
                Watchers:
                1 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: