xawyong opened a new issue #13507: URL: https://github.com/apache/airflow/issues/13507
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These questions are the first thing we need to know to understand the context. --> **Apache Airflow version**: ``` [root@test ~]# airflow version 2.0.0 [root@test ~]# airflow config get-value core executor SequentialExecutor [root@test ~]# ``` **Kubernetes version (if you are using kubernetes)** (use `kubectl version`): N/A **Environment**: ``` [root@test ~]# uname -a Linux test 3.10.0-1160.11.1.el7.x86_64 #1 SMP Mon Nov 30 13:05:31 EST 2020 x86_64 x86_64 x86_64 GNU/Linux [root@test ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 7.9 (Maipo) [root@test ~]# cat /etc/os-release NAME="Red Hat Enterprise Linux Server" VERSION="7.9 (Maipo)" ID="rhel" ID_LIKE="fedora" VARIANT="Server" VARIANT_ID="server" VERSION_ID="7.9" PRETTY_NAME="Red Hat Enterprise Linux Server 7.9 (Maipo)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:redhat:enterprise_linux:7.9:GA:server" HOME_URL="https://www.redhat.com/"; BUG_REPORT_URL="https://bugzilla.redhat.com/"; REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 7" REDHAT_BUGZILLA_PRODUCT_VERSION=7.9 REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux" REDHAT_SUPPORT_PRODUCT_VERSION="7.9" [root@test ~]# ``` - **Cloud provider or hardware configuration**: - **OS** (e.g. from /etc/os-release): - **Kernel** (e.g. `uname -a`): - **Install tools**: - **Others**: **What happened**: just follow [quick start](https://airflow.apache.org/docs/apache-airflow/stable/start.html), and config ``` executor = DaskExecutor and sql_alchemy_conn = postgresql://postgres:postgres@localhost:5432/airflow ``` then run ``` airflow db init airflow db reset airflow webserver -D [root@test ~]# airflow scheduler ____________ _____________ ____ |__( )_________ __/__ /________ __ ____ /| |_ /__ ___/_ /_ __ /_ __ \_ | /| / / ___ ___ | / _ / _ __/ _ / / /_/ /_ |/ |/ / _/_/ |_/_/ /_/ /_/ /_/ \____/____/|__/ [2021-01-06 03:58:31,138] {scheduler_job.py:1241} INFO - Starting the scheduler [2021-01-06 03:58:31,139] {scheduler_job.py:1246} INFO - Processing each file at most -1 times /usr/local/lib/python3.7/site-packages/distributed/client.py:1128 VersionMismatchWarning: Mismatched versions found +-------------+-----------+-----------------------+-----------------------+ | Package | client | scheduler | workers | +-------------+-----------+-----------------------+-----------------------+ | distributed | 2020.12.0 | 2020.12.0+11.g4386b75 | 2020.12.0+11.g4386b75 | +-------------+-----------+-----------------------+-----------------------+ [2021-01-06 03:58:31,195] {dag_processing.py:250} INFO - Launched DagFileProcessorManager with pid: 16318 [2021-01-06 03:58:31,197] {scheduler_job.py:1751} INFO - Resetting orphaned tasks for active dag runs [2021-01-06 03:58:31,203] {settings.py:52} INFO - Configured default timezone Timezone('UTC') [2021-01-06 03:58:31,227] {scheduler_job.py:1293} ERROR - Exception when executing SchedulerJob._run_scheduler_loop Traceback (most recent call last): File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1277, in _execute_context cursor, statement, parameters, context File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 593, in do_execute cursor.execute(statement, parameters) psycopg2.errors.SyntaxError: syntax error at or near "SKIP" LINE 3: ...run.state = 'running' FOR UPDATE OF task_instance SKIP LOCKE... ^ The above exception was the direct cause of the following exception: Traceback (most recent call last): File "/usr/local/lib/python3.7/site-packages/airflow/jobs/scheduler_job.py", line 1275, in _execute self._run_scheduler_loop() File "/usr/local/lib/python3.7/site-packages/airflow/jobs/scheduler_job.py", line 1349, in _run_scheduler_loop self.adopt_or_reset_orphaned_tasks() File "/usr/local/lib/python3.7/site-packages/airflow/utils/session.py", line 65, in wrapper return func(*args, session=session, **kwargs) File "/usr/local/lib/python3.7/site-packages/airflow/jobs/scheduler_job.py", line 1787, in adopt_or_reset_orphaned_tasks tis_to_reset_or_adopt = with_row_locks(query, of=TI, **skip_locked(session=session)).all() File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3373, in all return list(self) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3535, in __iter__ return self._execute_and_instances(context) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/orm/query.py", line 3560, in _execute_and_instances result = conn.execute(querycontext.statement, self._params) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1011, in execute return meth(self, multiparams, params) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/sql/elements.py", line 298, in _execute_on_connection return connection._execute_clauseelement(self, multiparams, params) File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1130, in _execute_clauseelement distilled_params, File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1317, in _execute_context e, statement, parameters, cursor, context File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1511, in _handle_dbapi_exception sqlalchemy_exception, with_traceback=exc_info[2], from_=e File "/usr/local/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 182, in raise_ raise exception File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1277, in _execute_context cursor, statement, parameters, context File "/usr/local/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 593, in do_execute cursor.execute(statement, parameters) sqlalchemy.exc.ProgrammingError: (psycopg2.errors.SyntaxError) syntax error at or near "SKIP" LINE 3: ...run.state = 'running' FOR UPDATE OF task_instance SKIP LOCKE... ^ [SQL: SELECT task_instance.task_id AS task_instance_task_id, task_instance.dag_id AS task_instance_dag_id, task_instance.execution_date AS task_instance_execution_date FROM task_instance LEFT OUTER JOIN job ON task_instance.queued_by_job_id = job.id JOIN dag_run ON task_instance.dag_id = dag_run.dag_id AND task_instance.execution_date = dag_run.execution_date WHERE task_instance.state IN (%(state_1)s, %(state_2)s, %(state_3)s) AND (task_instance.queued_by_job_id IS NULL OR job.state != %(state_4)s) AND dag_run.run_type != %(run_type_1)s AND dag_run.state = %(state_5)s FOR UPDATE OF task_instance SKIP LOCKED] [parameters: {'state_1': 'scheduled', 'state_2': 'queued', 'state_3': 'running', 'state_4': 'running', 'run_type_1': <DagRunType.BACKFILL_JOB: 'backfill'>, 'state_5': 'running'}] (Background on this error at: http://sqlalche.me/e/13/f405) [2021-01-06 03:58:32,243] {process_utils.py:95} INFO - Sending Signals.SIGTERM to GPID 16318 [2021-01-06 03:58:32,448] {process_utils.py:201} INFO - Waiting up to 5 seconds for processes to exit... [2021-01-06 03:58:32,465] {process_utils.py:61} INFO - Process psutil.Process(pid=16318, status='terminated', exitcode=0, started='03:58:30') (16318) terminated with exit code 0 [2021-01-06 03:58:32,466] {process_utils.py:61} INFO - Process psutil.Process(pid=16368, status='terminated', started='03:58:31') (16368) terminated with exit code None [2021-01-06 03:58:32,466] {process_utils.py:61} INFO - Process psutil.Process(pid=16369, status='terminated', started='03:58:31') (16369) terminated with exit code None [2021-01-06 03:58:32,467] {scheduler_job.py:1296} INFO - Exited execute loop [root@test ~]# ``` <!-- (please include exact error messages if you can) --> **What you expected to happen**: <!-- What do you think went wrong? --> **How to reproduce it**: <!--- As minimally and precisely as possible. Keep in mind we do not have access to your cluster or dags. 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