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  1. MariaDB Server
  2. MDEV-20852

BtrBulk is unnecessarily holding dict_index_t::lock

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      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

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              Assignee:
              marko Marko Mäkelä
              Reporter:
              marko Marko Mäkelä
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