problem

AutoQA (spellcheck and termtagger) segment processing may result in a deadlock on locking segments for usage. This may result in the following exception:

       level: ERROR
       ecode: E9999
      domain: core
     message: PDOException: There is already an active transaction

since on a deadlock the code is retried with an active transaction leading to that exception.

solution

rollback in case of an error