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      I'm using mariadb galera cluster.(3 node)
      One of the three nodes was suddenly hanged.
      Select was not performed on all databases.
      The innodb engine status is recorded in the error log.

      In the "BUFFER POOL AND MEMORY" part, the following error occurs.
      ----------------------------------------------------------------------------------------------------
      InnoDB: Warning: a long semaphore wait:
      --Thread 140485378886400 has waited at dict0dict.cc line 7282 for 272.00 seconds the semaphore:
      Mutex at 0x7fc694823ce8 '&dict_sys->mutex', lock var 1
      Last time reserved by thread 140459791861504 in file not yet reserved line 0, waiters flag 1
      ----------------------------------------------------------------------------------------------------
      Is this related to hang?

      Besides that, what did this mean?
      InnoDB: Error (Duplicate key) writing word node to FTS auxiliary index table.

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            jplindst Jan Lindström (Inactive)
            aaaaaaaaaa kim (Inactive)
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