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  1. MariaDB Server
  2. MDEV-34692

purge coordinator task acquires MDL but not visible in performance_schema.metadata_locks

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      While debugging a DDL problem due to MDEV-33819 I noticed that there were no competing MDL visible in performance_schema.metadata_locks

      Upon enabling the older plugin, I could see hundreds of MDL_SHARED locks from Thread=0 in information_schema.metadata_lock_info which I assume was purge coordinator task.

      Upgrading resolved large HLL, releasing MDL_SHARED, and allowing DDL on impacted tables, but this problem was harder to debug with no related records found in performance_schema.metadata_locks

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            thiru Thirunarayanan Balathandayuthapani
            mg MG
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