[jira] [Commented] (AIRFLOW-1235) Odd behaviour when all gunicorn workers die

["John Arnold (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-1235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392021#comment-16392021 ] 

John Arnold commented on AIRFLOW-1235:
--------------------------------------

I have this same problem – workers fail due to postgres issue, gunicorn master hangs, but airflow webserver doesn't detect the hang and die.  It just zombies.  If it would just die, then my container could exit and be restarted.

> Odd behaviour when all gunicorn workers die
> -------------------------------------------
>
>                 Key: AIRFLOW-1235
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1235
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: webserver
>    Affects Versions: 1.8.0
>            Reporter: Erik Forsberg
>            Assignee: Kengo Seki
>            Priority: Major
>
> The webserver has sometimes stopped responding to port 443, and today I found the issue - I had a misconfigured resolv.conf that made it unable to talk to my postgresql. This was the root cause, but the way airflow webserver behaved was a bit odd.
> It seems that when all gunicorn workers failed to start, the gunicorn master shut down. However, the main process (the one that starts gunicorn master) did not shut down, so there was no way of detecting the failed status of webserver from e.g. systemd or init script.
> Full traceback leading to stale webserver process:
> {noformat}
> May 21 09:51:57 airmaster01 airflow[26451]: [2017-05-21 09:51:57 +0000] [23794] [ERROR] Exception in worker process:
> May 21 09:51:57 airmaster01 airflow[26451]: Traceback (most recent call last):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1122, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: return self._pool.get(wait, self._timeout)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/queue.py", line 145, in get
> May 21 09:51:57 airmaster01 airflow[26451]: raise Empty
> May 21 09:51:57 airmaster01 airflow[26451]: sqlalchemy.util.queue.Empty
> May 21 09:51:57 airmaster01 airflow[26451]: During handling of the above exception, another exception occurred:
> May 21 09:51:57 airmaster01 airflow[26451]: Traceback (most recent call last):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect
> May 21 09:51:57 airmaster01 airflow[26451]: return fn()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 387, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return _ConnectionFairy._checkout(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 766, in _checkout
> May 21 09:51:57 airmaster01 airflow[26451]: fairy = _ConnectionRecord.checkout(pool)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 516, in checkout
> May 21 09:51:57 airmaster01 airflow[26451]: rec = pool._do_get()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1138, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: self._dec_overflow()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
> May 21 09:51:57 airmaster01 airflow[26451]: compat.reraise(exc_type, exc_value, exc_tb)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
> May 21 09:51:57 airmaster01 airflow[26451]: raise value
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1135, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: return self._create_connection()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
> May 21 09:51:57 airmaster01 airflow[26451]: return _ConnectionRecord(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 461, in __init__
> May 21 09:51:57 airmaster01 airflow[26451]: self.__connect(first_connect_check=True)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 651, in __connect
> May 21 09:51:57 airmaster01 airflow[26451]: connection = pool._invoke_creator(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/strategies.py", line 105, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return dialect.connect(*cargs, **cparams)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 393, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return self.dbapi.connect(*cargs, **cparams)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/psycopg2/__init__.py", line 130, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
> May 21 09:51:57 airmaster01 airflow[26451]: psycopg2.OperationalError: could not translate host name "airstorage01.example.com" to address: Name or service not known
> May 21 09:51:57 airmaster01 airflow[26451]: The above exception was the direct cause of the following exception:
> May 21 09:51:57 airmaster01 airflow[26451]: Traceback (most recent call last):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/arbiter.py", line 507, in spawn_worker
> May 21 09:51:57 airmaster01 airflow[26451]: worker.init_process()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/workers/base.py", line 118, in init_process
> May 21 09:51:57 airmaster01 airflow[26451]: self.wsgi = self.app.wsgi()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/app/base.py", line 67, in wsgi
> May 21 09:51:57 airmaster01 airflow[26451]: self.callable = self.load()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
> May 21 09:51:57 airmaster01 airflow[26451]: return self.load_wsgiapp()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
> May 21 09:51:57 airmaster01 airflow[26451]: return util.import_app(self.app_uri)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/util.py", line 366, in import_app
> May 21 09:51:57 airmaster01 airflow[26451]: app = eval(obj, mod.__dict__)
> May 21 09:51:57 airmaster01 airflow[26451]: File "<string>", line 1, in <module>
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/app.py", line 161, in cached_app
> May 21 09:51:57 airmaster01 airflow[26451]: app = create_app(config)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/app.py", line 60, in create_app
> May 21 09:51:57 airmaster01 airflow[26451]: from airflow.www import views
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/views.py", line 1975, in <module>
> May 21 09:51:57 airmaster01 airflow[26451]: class ChartModelView(wwwutils.DataProfilingMixin, AirflowModelView):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/views.py", line 2057, in ChartModelView
> May 21 09:51:57 airmaster01 airflow[26451]: .group_by(models.Connection.conn_id)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2855, in __iter__
> May 21 09:51:57 airmaster01 airflow[26451]: return self._execute_and_instances(context)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2876, in _execute_and_instances
> May 21 09:51:57 airmaster01 airflow[26451]: close_with_result=True)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2885, in _get_bind_args
> May 21 09:51:57 airmaster01 airflow[26451]: **kw
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2867, in _connection_from_session
> May 21 09:51:57 airmaster01 airflow[26451]: conn = self.session.connection(**kw)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 966, in connection
> May 21 09:51:57 airmaster01 airflow[26451]: cannot otherwise be identified.
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 971, in _connection_for_bind
> May 21 09:51:57 airmaster01 airflow[26451]: closed.  This flag only has an effect if this :class:`.Session` is
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 403, in _connection_for_bind
> May 21 09:51:57 airmaster01 airflow[26451]: conn = bind.contextual_connect()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2112, in contextual_connect
> May 21 09:51:57 airmaster01 airflow[26451]: self._wrap_pool_connect(self.pool.connect, None),
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2151, in _wrap_pool_connect
> May 21 09:51:57 airmaster01 airflow[26451]: e, dialect, self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1465, in _handle_dbapi_exception_noconnection
> May 21 09:51:57 airmaster01 airflow[26451]: exc_info
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
> May 21 09:51:57 airmaster01 airflow[26451]: reraise(type(exception), exception, tb=exc_tb, cause=cause)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
> May 21 09:51:57 airmaster01 airflow[26451]: raise value.with_traceback(tb)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect
> May 21 09:51:57 airmaster01 airflow[26451]: return fn()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 387, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return _ConnectionFairy._checkout(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 766, in _checkout
> May 21 09:51:57 airmaster01 airflow[26451]: fairy = _ConnectionRecord.checkout(pool)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 516, in checkout
> May 21 09:51:57 airmaster01 airflow[26451]: rec = pool._do_get()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1138, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: self._dec_overflow()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
> May 21 09:51:57 airmaster01 airflow[26451]: compat.reraise(exc_type, exc_value, exc_tb)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
> May 21 09:51:57 airmaster01 airflow[26451]: raise value
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1135, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: return self._create_connection()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
> May 21 09:51:57 airmaster01 airflow[26451]: return _ConnectionRecord(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 461, in __init__
> May 21 09:51:57 airmaster01 airflow[26451]: self.__connect(first_connect_check=True)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 651, in __connect
> May 21 09:51:57 airmaster01 airflow[26451]: connection = pool._invoke_creator(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/strategies.py", line 105, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return dialect.connect(*cargs, **cparams)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 393, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return self.dbapi.connect(*cargs, **cparams)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/psycopg2/__init__.py", line 130, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
> May 21 09:51:57 airmaster01 airflow[26451]: sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "airstorage01.example.com" to address: Name or service not known
> May 21 09:51:57 airmaster01 airflow[26451]: Traceback (most recent call last):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1122, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: return self._pool.get(wait, self._timeout)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/queue.py", line 145, in get
> May 21 09:51:57 airmaster01 airflow[26451]: raise Empty
> May 21 09:51:57 airmaster01 airflow[26451]: sqlalchemy.util.queue.Empty
> May 21 09:51:57 airmaster01 airflow[26451]: During handling of the above exception, another exception occurred:
> May 21 09:51:57 airmaster01 airflow[26451]: Traceback (most recent call last):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect
> May 21 09:51:57 airmaster01 airflow[26451]: return fn()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 387, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return _ConnectionFairy._checkout(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 766, in _checkout
> May 21 09:51:57 airmaster01 airflow[26451]: fairy = _ConnectionRecord.checkout(pool)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 516, in checkout
> May 21 09:51:57 airmaster01 airflow[26451]: rec = pool._do_get()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1138, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: self._dec_overflow()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
> May 21 09:51:57 airmaster01 airflow[26451]: compat.reraise(exc_type, exc_value, exc_tb)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
> May 21 09:51:57 airmaster01 airflow[26451]: raise value
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1135, in _do_get
> May 21 09:51:57 airmaster01 airflow[26451]: return self._create_connection()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
> May 21 09:51:57 airmaster01 airflow[26451]: return _ConnectionRecord(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 461, in __init__
> May 21 09:51:57 airmaster01 airflow[26451]: self.__connect(first_connect_check=True)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 651, in __connect
> May 21 09:51:57 airmaster01 airflow[26451]: connection = pool._invoke_creator(self)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/strategies.py", line 105, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return dialect.connect(*cargs, **cparams)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 393, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: return self.dbapi.connect(*cargs, **cparams)
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/psycopg2/__init__.py", line 130, in connect
> May 21 09:51:57 airmaster01 airflow[26451]: conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
> May 21 09:51:57 airmaster01 airflow[26451]: psycopg2.OperationalError: could not translate host name "airstorage01.example.com" to address: Name or service not known
> May 21 09:51:57 airmaster01 airflow[26451]: The above exception was the direct cause of the following exception:
> May 21 09:51:57 airmaster01 airflow[26451]: Traceback (most recent call last):
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/arbiter.py", line 507, in spawn_worker
> May 21 09:51:57 airmaster01 airflow[26451]: worker.init_process()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/workers/base.py", line 118, in init_process
> May 21 09:51:57 airmaster01 airflow[26451]: self.wsgi = self.app.wsgi()
> May 21 09:51:57 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/app/base.py", line 67, in wsgi
> May 21 09:51:58 airmaster01 airflow[26451]: self.callable = self.load()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/app/wsgiapp.py", line 65, in load
> May 21 09:51:58 airmaster01 airflow[26451]: return self.load_wsgiapp()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/app/wsgiapp.py", line 52, in load_wsgiapp
> May 21 09:51:58 airmaster01 airflow[26451]: return util.import_app(self.app_uri)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/gunicorn/util.py", line 366, in import_app
> May 21 09:51:58 airmaster01 airflow[26451]: app = eval(obj, mod.__dict__)
> May 21 09:51:58 airmaster01 airflow[26451]: File "<string>", line 1, in <module>
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/app.py", line 161, in cached_app
> May 21 09:51:58 airmaster01 airflow[26451]: app = create_app(config)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/app.py", line 60, in create_app
> May 21 09:51:58 airmaster01 airflow[26451]: from airflow.www import views
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/views.py", line 1975, in <module>
> May 21 09:51:58 airmaster01 airflow[26451]: class ChartModelView(wwwutils.DataProfilingMixin, AirflowModelView):
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/airflow/www/views.py", line 2057, in ChartModelView
> May 21 09:51:58 airmaster01 airflow[26451]: .group_by(models.Connection.conn_id)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2855, in __iter__
> May 21 09:51:58 airmaster01 airflow[26451]: return self._execute_and_instances(context)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2876, in _execute_and_instances
> May 21 09:51:58 airmaster01 airflow[26451]: close_with_result=True)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2885, in _get_bind_args
> May 21 09:51:58 airmaster01 airflow[26451]: **kw
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/query.py", line 2867, in _connection_from_session
> May 21 09:51:58 airmaster01 airflow[26451]: conn = self.session.connection(**kw)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 966, in connection
> May 21 09:51:58 airmaster01 airflow[26451]: cannot otherwise be identified.
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 971, in _connection_for_bind
> May 21 09:51:58 airmaster01 airflow[26451]: closed.  This flag only has an effect if this :class:`.Session` is
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/orm/session.py", line 403, in _connection_for_bind
> May 21 09:51:58 airmaster01 airflow[26451]: conn = bind.contextual_connect()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2112, in contextual_connect
> May 21 09:51:58 airmaster01 airflow[26451]: self._wrap_pool_connect(self.pool.connect, None),
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2151, in _wrap_pool_connect
> May 21 09:51:58 airmaster01 airflow[26451]: e, dialect, self)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1465, in _handle_dbapi_exception_noconnection
> May 21 09:51:58 airmaster01 airflow[26451]: exc_info
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 203, in raise_from_cause
> May 21 09:51:58 airmaster01 airflow[26451]: reraise(type(exception), exception, tb=exc_tb, cause=cause)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 186, in reraise
> May 21 09:51:58 airmaster01 airflow[26451]: raise value.with_traceback(tb)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2147, in _wrap_pool_connect
> May 21 09:51:58 airmaster01 airflow[26451]: return fn()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 387, in connect
> May 21 09:51:58 airmaster01 airflow[26451]: return _ConnectionFairy._checkout(self)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 766, in _checkout
> May 21 09:51:58 airmaster01 airflow[26451]: fairy = _ConnectionRecord.checkout(pool)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 516, in checkout
> May 21 09:51:58 airmaster01 airflow[26451]: rec = pool._do_get()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1138, in _do_get
> May 21 09:51:58 airmaster01 airflow[26451]: self._dec_overflow()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
> May 21 09:51:58 airmaster01 airflow[26451]: compat.reraise(exc_type, exc_value, exc_tb)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 187, in reraise
> May 21 09:51:58 airmaster01 airflow[26451]: raise value
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1135, in _do_get
> May 21 09:51:58 airmaster01 airflow[26451]: return self._create_connection()
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 333, in _create_connection
> May 21 09:51:58 airmaster01 airflow[26451]: return _ConnectionRecord(self)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 461, in __init__
> May 21 09:51:58 airmaster01 airflow[26451]: self.__connect(first_connect_check=True)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/pool.py", line 651, in __connect
> May 21 09:51:58 airmaster01 airflow[26451]: connection = pool._invoke_creator(self)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/strategies.py", line 105, in connect
> May 21 09:51:58 airmaster01 airflow[26451]: return dialect.connect(*cargs, **cparams)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 393, in connect
> May 21 09:51:58 airmaster01 airflow[26451]: return self.dbapi.connect(*cargs, **cparams)
> May 21 09:51:58 airmaster01 airflow[26451]: File "/opt/airflow/production/lib/python3.4/site-packages/psycopg2/__init__.py", line 130, in connect
> May 21 09:51:58 airmaster01 airflow[26451]: conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
> May 21 09:51:58 airmaster01 airflow[26451]: sqlalchemy.exc.OperationalError: (psycopg2.OperationalError) could not translate host name "airstorage01.example.com" to address: Name or service not known
> May 21 09:51:58 airmaster01 airflow[26451]: [2017-05-21 09:51:57 +0000] [23794] [INFO] Worker exiting (pid: 23794)
> May 21 09:51:58 airmaster01 airflow[26451]: /opt/airflow/production/lib/python3.4/site-packages/flask/exthook.py:71: ExtDeprecationWarning: Importing flask.ext.cache is deprecated, use flask_cache instead.
> May 21 09:51:58 airmaster01 airflow[26451]: .format(x=modname), ExtDeprecationWarning
> May 21 09:51:58 airmaster01 airflow[26451]: [2017-05-21 09:51:58 +0000] [23561] [INFO] Worker exiting (pid: 23561)
> May 21 09:51:58 airmaster01 airflow[26451]: /opt/airflow/production/lib/python3.4/site-packages/flask/exthook.py:71: ExtDeprecationWarning: Importing flask.ext.cache is deprecated, use flask_cache instead.
> May 21 09:51:58 airmaster01 airflow[26451]: .format(x=modname), ExtDeprecationWarning
> May 21 09:51:58 airmaster01 airflow[26451]: [2017-05-21 09:51:58 +0000] [23759] [INFO] Worker exiting (pid: 23759)
> May 21 09:51:58 airmaster01 airflow[26451]: /opt/airflow/production/lib/python3.4/site-packages/flask/exthook.py:71: ExtDeprecationWarning: Importing flask.ext.cache is deprecated, use flask_cache instead.
> May 21 09:51:58 airmaster01 airflow[26451]: .format(x=modname), ExtDeprecationWarning
> May 21 09:51:58 airmaster01 airflow[26451]: [2017-05-21 09:51:58 +0000] [23620] [INFO] Worker exiting (pid: 23620)
> May 21 09:51:58 airmaster01 airflow[26451]: /opt/airflow/production/lib/python3.4/site-packages/flask/exthook.py:71: ExtDeprecationWarning: Importing flask.ext.cache is deprecated, use flask_cache instead.
> May 21 09:51:58 airmaster01 airflow[26451]: .format(x=modname), ExtDeprecationWarning
> May 21 09:51:58 airmaster01 airflow[26451]: [2017-05-21 09:51:58 +0000] [23689] [INFO] Worker exiting (pid: 23689)
> May 21 09:51:59 airmaster01 airflow[26451]: [2017-05-21 09:51:59 +0000] [26464] [INFO] Shutting down: Master
> May 21 09:51:59 airmaster01 airflow[26451]: [2017-05-21 09:51:59 +0000] [26464] [INFO] Reason: Worker failed to boot.
> {noformat}



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