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DatabaseError между Oracle и Django с Celery

У меня проблемы с тем, что кажется очень последний шаг в развертывании проекта Django-Celery-RabbitMQ.

После запуска служб celery, httpd и rabbitmq-server через systemd, когда я запускаю задачу в Django, я вижу сообщение Received task: smartalec.tasks.match_loadfile_task

Где smartalec - это мое приложение, а match_loadfile_task - моя задача, проект называется tcida_api.

Но примерно через 30 секунд появляется огромная трассировка стека, которая начинается следующим образом (полный журнал отладки за исключением ниже).

[2016-09-09 15:34:20,040: ERROR/MainProcess] Task smartalec.tasks.match_loadfile_task[740dc792-7410-4418-aa44-dd9c56b63b04] raised unexpected: DatabaseError(' <cx_Oracle._Error object at 0x3a3ed50>',)

При поиске в Google по запросу «Django Oracle Celery DatabaseError» возникают некоторые запросы о совместном использовании потоков в одном соединении, но я не уверен, применимо ли это ко мне, поскольку у меня есть «threadaded = TRUE» в моей конфигурации базы данных в project.settings.

Я получаю то же самое, когда запускаю сельдерей из командной строки.

sudo /opt/tcida/virtualenv/smartalec/bin/celery -A my_django_project worker -l info

У меня не установлен django celery, Django может без проблем выполнять запросы к базе данных, через оболочку и веб-страницы, конфигурация работает на моем локальном компьютере с использованием сервера разработки django.

Что может вызвать или устранить это исключение?

Полный журнал Celery DEBUG, не включая полную трассировку стека.

[amartin@ip-10-50-7-148 tcida_api]$ sudo /opt/tcida/virtualenv/smartalec/bin/celery -A tcida_api worker --concurrency 1 -l debug
/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/celery/platforms.py:812: RuntimeWarning: You are running the worker with superuser privileges, which is absolutely not recommended!

Please specify a different user using the -u option.

User information: uid=0 euid=0 gid=0 egid=0

  uid=uid, euid=euid, gid=gid, egid=egid,
[2016-09-09 16:14:22,995: DEBUG/MainProcess] | Worker: Preparing bootsteps.
[2016-09-09 16:14:22,997: DEBUG/MainProcess] | Worker: Building graph...
[2016-09-09 16:14:22,997: DEBUG/MainProcess] | Worker: New boot order: {Timer, Hub, Queues (intra), Pool, Autoscaler, StateDB, Autoreloader, Beat, Consumer}
[2016-09-09 16:14:22,999: DEBUG/MainProcess] | Consumer: Preparing bootsteps.
[2016-09-09 16:14:23,000: DEBUG/MainProcess] | Consumer: Building graph...
[2016-09-09 16:14:23,003: DEBUG/MainProcess] | Consumer: New boot order: {Connection, Events, Mingle, Tasks, Control, Agent, Gossip, Heart, event loop}

 -------------- celery@ip-10-50-7-148.eu-west-1.compute.internal v3.1.23 (Cipater)
---- **** ----- 
--- * ***  * -- Linux-3.10.0-229.11.1.el7.x86_64-x86_64-with-redhat-7.1-Maipo
-- * - **** --- 
- ** ---------- [config]
- ** ---------- .> app:         tcida_api:0x1a91850
- ** ---------- .> transport:   amqp://guest:**@localhost:5672//
- ** ---------- .> results:     disabled://
- *** --- * --- .> concurrency: 1 (prefork)
-- ******* ---- 
--- ***** ----- [queues]
 -------------- .> celery           exchange=celery(direct) key=celery


[tasks]
  . celery.backend_cleanup
  . celery.chain
  . celery.chord
  . celery.chord_unlock
  . celery.chunks
  . celery.group
  . celery.map
  . celery.starmap
  . smartalec.tasks.match_loadfile_task

[2016-09-09 16:14:23,005: DEBUG/MainProcess] | Worker: Starting Hub
[2016-09-09 16:14:23,005: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:23,005: DEBUG/MainProcess] | Worker: Starting Pool
[2016-09-09 16:14:23,029: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:23,030: DEBUG/MainProcess] | Worker: Starting Consumer
[2016-09-09 16:14:23,030: DEBUG/MainProcess] | Consumer: Starting Connection
[2016-09-09 16:14:23,038: DEBUG/MainProcess] Start from server, version: 0.9, properties: {u'information': u'Licensed under the MPL.  See http://www.rabbitmq.com/', u'product': u'RabbitMQ', u'copyright': u'Copyright (C) 2007-2013 GoPivotal, Inc.', u'capabilities': {u'exchange_exchange_bindings': True, u'consumer_cancel_notify': True, u'publisher_confirms': True, u'basic.nack': True}, u'platform': u'Erlang/OTP', u'version': u'3.1.5'}, mechanisms: [u'PLAIN', u'AMQPLAIN'], locales: [u'en_US']
[2016-09-09 16:14:23,039: DEBUG/MainProcess] Open OK!
[2016-09-09 16:14:23,039: INFO/MainProcess] Connected to amqp://guest:**@127.0.0.1:5672//
[2016-09-09 16:14:23,040: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:23,040: DEBUG/MainProcess] | Consumer: Starting Events
[2016-09-09 16:14:23,047: DEBUG/MainProcess] Start from server, version: 0.9, properties: {u'information': u'Licensed under the MPL.  See http://www.rabbitmq.com/', u'product': u'RabbitMQ', u'copyright': u'Copyright (C) 2007-2013 GoPivotal, Inc.', u'capabilities': {u'exchange_exchange_bindings': True, u'consumer_cancel_notify': True, u'publisher_confirms': True, u'basic.nack': True}, u'platform': u'Erlang/OTP', u'version': u'3.1.5'}, mechanisms: [u'PLAIN', u'AMQPLAIN'], locales: [u'en_US']
[2016-09-09 16:14:23,047: DEBUG/MainProcess] Open OK!
[2016-09-09 16:14:23,048: DEBUG/MainProcess] using channel_id: 1
[2016-09-09 16:14:23,048: DEBUG/MainProcess] Channel open
[2016-09-09 16:14:23,049: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:23,049: DEBUG/MainProcess] | Consumer: Starting Mingle
[2016-09-09 16:14:23,049: INFO/MainProcess] mingle: searching for neighbors
[2016-09-09 16:14:23,050: DEBUG/MainProcess] using channel_id: 1
[2016-09-09 16:14:23,050: DEBUG/MainProcess] Channel open
[2016-09-09 16:14:24,056: INFO/MainProcess] mingle: all alone
[2016-09-09 16:14:24,057: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:24,057: DEBUG/MainProcess] | Consumer: Starting Tasks
[2016-09-09 16:14:24,059: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:24,059: DEBUG/MainProcess] | Consumer: Starting Control
[2016-09-09 16:14:24,059: DEBUG/MainProcess] using channel_id: 2
[2016-09-09 16:14:24,060: DEBUG/MainProcess] Channel open
[2016-09-09 16:14:24,062: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:24,062: DEBUG/MainProcess] | Consumer: Starting Gossip
[2016-09-09 16:14:24,062: DEBUG/MainProcess] using channel_id: 3
[2016-09-09 16:14:24,063: DEBUG/MainProcess] Channel open
[2016-09-09 16:14:24,065: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:24,065: DEBUG/MainProcess] | Consumer: Starting Heart
[2016-09-09 16:14:24,066: DEBUG/MainProcess] ^-- substep ok
[2016-09-09 16:14:24,066: DEBUG/MainProcess] | Consumer: Starting event loop
[2016-09-09 16:14:24,067: WARNING/MainProcess] celery@ip-10-50-7-148.eu-west-1.compute.internal ready.
[2016-09-09 16:14:24,067: DEBUG/MainProcess] | Worker: Hub.register Pool...
[2016-09-09 16:14:24,067: DEBUG/MainProcess] basic.qos: prefetch_count->4
[2016-09-09 16:14:31,300: INFO/MainProcess] Received task: smartalec.tasks.match_loadfile_task[51fed74e-f0ce-4cad-9a3d-283b830939d6]
[2016-09-09 16:14:31,300: DEBUG/MainProcess] TaskPool: Apply <function _fast_trace_task at 0x1c50500> (args:(u'smartalec.tasks.match_loadfile_task', u'51fed74e-f0ce-4cad-9a3d-283b830939d6', [1], {}, {u'utc': True, u'is_eager': False, u'chord': None, u'group': None, u'args': [1], u'retries': 0, u'delivery_info': {u'priority': 0, u'redelivered': False, u'routing_key': u'celery', u'exchange': u'celery'}, u'expires': None, u'hostname': 'celery@ip-10-50-7-148.eu-west-1.compute.internal', u'task': u'smartalec.tasks.match_loadfile_task', u'callbacks': None, u'correlation_id': u'51fed74e-f0ce-4cad-9a3d-283b830939d6', u'errbacks': None, u'timelimit': [None, None], u'taskset': None, u'kwargs': {}, u'eta': None, u'reply_to': u'950dab7a-8608-37e0-991a-5e7c6dadbf4a', u'id': u'51fed74e-f0ce-4cad-9a3d-283b830939d6', u'headers': {}}) kwargs:{})
[2016-09-09 16:14:31,310: DEBUG/MainProcess] Task accepted: smartalec.tasks.match_loadfile_task[51fed74e-f0ce-4cad-9a3d-283b830939d6] pid:25239
[2016-09-09 16:15:26,475: ERROR/MainProcess] Task smartalec.tasks.match_loadfile_task[51fed74e-f0ce-4cad-9a3d-283b830939d6] raised unexpected: DatabaseError('<cx_Oracle._Error object at 0x36c9d50>',)
Traceback (most recent call last):
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/celery/app/trace.py", line 438, in __protected_call__
    return self.run(*args, **kwargs)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/smartalec/tasks.py", line 14, in match_loadfile_task
    load_file = LoadFile.objects.get(pk=loadfile_pk)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/manager.py", line 85, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/query.py", line 379, in get
    num = len(clone)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/query.py", line 238, in __len__
    self._fetch_all()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/query.py", line 1087, in _fetch_all
    self._result_cache = list(self.iterator())
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/query.py", line 54, in __iter__
    results = compiler.execute_sql()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 824, in execute_sql
    sql, params = self.as_sql()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/oracle/compiler.py", line 22, in as_sql
    subquery=subquery,
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 376, in as_sql
    where, w_params = self.compile(self.where) if self.where is not None else ("", [])
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 353, in compile
    sql, params = node.as_sql(self, self.connection)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/sql/where.py", line 79, in as_sql
    sql, params = compiler.compile(child)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 353, in compile
    sql, params = node.as_sql(self, self.connection)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/lookups.py", line 158, in as_sql
    rhs_sql = self.get_rhs_op(connection, rhs_sql)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/models/lookups.py", line 162, in get_rhs_op
    return connection.operators[self.lookup_name] % rhs
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/oracle/base.py", line 80, in __get__
    instance.cursor().close()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/base/base.py", line 233, in cursor
    cursor = self.make_cursor(self._cursor())
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/base/base.py", line 204, in _cursor
    self.ensure_connection()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/base/base.py", line 199, in ensure_connection
    self.connect()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/utils.py", line 94, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/base/base.py", line 199, in ensure_connection
    self.connect()
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/base/base.py", line 171, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/opt/tcida/virtualenv/smartalec/lib/python2.7/site-packages/django/db/backends/oracle/base.py", line 216, in get_new_connection
    return Database.connect(conn_string, **conn_params)
DatabaseError: <cx_Oracle._Error object at 0x36c9d50>

Убедитесь, что пользователь, под которым работает сельдерей (который должен быть пользователем с оболочкой, по соглашению называется celery) имеет TNS_ADMIN установлен в его среде.

Если вы запускаете службу сельдерея через systemd, то она будет контролироваться с помощью файла с именем celery.service с путем что-то вроде /etc/systemd/system/celery.serviceи разрешения 644. В этом файле под [Service] раздел используйте одну из директив Environment для установки файлов среды напрямую или EnvironmentFile использовать файл переменных окружения.

Также убедитесь, что понимаете разницу между услугами celery и celeryd, Я действительно не знаю, что это такое, но их нельзя использовать взаимозаменяемо, как вы / я.