Sangameshmsopen commented on issue #8181:
URL: https://github.com/apache/airflow/issues/8181#issuecomment-1424198453
Hello all,
We have observed that in Airflow scheduler heartbeat has stopped and all the
DAGs were in queued or running state. We have checked scheduler logs and got
the below error. May i know what might be the cause for this.
Details: We are running Airflow in Google cloud Composer service with below
versions
composer-2.1.4
airflow-2.4.3
Thanks in advance
sqlalchemy.exc.PendingRollbackError: This Session's transaction has been
rolled back due to a previous exception during flush. To begin a new
transaction with this Session, first issue Session.rollback(). Original
exception was: (psycopg2.errors.UniqueViolation) duplicate key value violates
unique constraint "task_instance_pkey"
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