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  1. MariaDB Server
  2. MDEV-23234

move MDL from THD to st_transaction

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    Details

    • Type: Task
    • Status: Open (View Workflow)
    • Priority: Major
    • Resolution: Unresolved
    • Fix Version/s: 10.6
    • Component/s: Locking
    • Labels:
      None

      Description

      MDL belongs to a transaction, not to a connection. For example, when a transaction is moved to a different thd, MDLs should be moved too.

      Problem, what if a connection owns more than one open transaction and they have conflicting lock requests? It cannot wait on itself, so deadlock detector has to be able to detect a loop right away.

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          relates to

          Bug - A problem which impairs or prevents the functions of the product. MDEV-21602 CREATE TABLE…PRIMARY KEY…SELECT workaround causes DROP TABLE to ignore locks

          • Major - Major loss of function.
          • Confirmed

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              Assignee:
              wlad Vladislav Vaintroub
              Reporter:
              serg Sergei Golubchik
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                Dates

                Created:
                Updated: