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  1. MariaDB Server
  2. MDEV-23234

move MDL from THD to st_transaction

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    • Task
    • Status: Open (View Workflow)
    • Major
    • Resolution: Unresolved
    • None
    • Locking
    • 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

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

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              wlad Vladislav Vaintroub
              serg Sergei Golubchik
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