Celery dies with DBPageNotFoundError

Question

I have 3 machines with celery workers and rabbitmq as a broker, one worker is running with beat flag, all of this is managed by supervisor, and sometimes celery dies with such error. This error appears only on beat worker, but when it appears, workers on all machines dies. (celery==3.1.12, kombu==3.0.20)

[2014-07-05 08:37:04,297: INFO/MainProcess] Connected to amqp://user:**@192.168.15.106:5672//
[2014-07-05 08:37:04,311: ERROR/Beat] Process Beat
Traceback (most recent call last):
File "/var/projects/env/local/lib/python2.7/site-packages/billiard/process.py", line 292, in _bootstrap
self.run()
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 527, in run
self.service.start(embedded_process=True)
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 453, in start
humanize_seconds(self.scheduler.max_interval))
File "/var/projects/env/local/lib/python2.7/site-packages/kombu/utils/__init__.py", line 322, in __get__
value = obj.__dict__[self.__name__] = self.__get(obj)
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 491, in scheduler
return self.get_scheduler()
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 486, in get_scheduler
lazy=lazy)
File "/var/projects/env/local/lib/python2.7/site-packages/celery/utils/imports.py", line 53, in instantiate
return symbol_by_name(name)(*args, **kwargs)
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 357, in __init__
Scheduler.__init__(self, *args, **kwargs)
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 184, in __init__
self.setup_schedule()
File "/var/projects/env/local/lib/python2.7/site-packages/celery/beat.py", line 376, in setup_schedule
self._store['entries']
File "/usr/lib/python2.7/shelve.py", line 121, in __getitem__
f = StringIO(self.dict[key])
File "/usr/lib/python2.7/bsddb/__init__.py", line 270, in __getitem__
return _DeadlockWrap(lambda: self.db[key])  # self.db[key]
File "/usr/lib/python2.7/bsddb/dbutils.py", line 68, in DeadlockWrap
return function(*_args, **_kwargs)
File "/usr/lib/python2.7/bsddb/__init__.py", line 270, in <lambda>
return _DeadlockWrap(lambda: self.db[key])  # self.db[key]
DBPageNotFoundError: (-30985, 'DB_PAGE_NOTFOUND: Requested page not found')

Answer 1

I've ran into this issue and the cause was a corrupted db file (usually named "celerybeat-schedule"). Solution would be to delete the existing db file and restart the process.

Relavent:bsddb.db.DBPageNotFoundError https://mail.python.org/pipermail/python-list/2009-October/554552.html

Answer 2

I had to remove some temp files in the /tmp directory. One was named celeryd-<NAME_OF_WORKER>-state and also celeryd-<NAME_OF_WORKER>-state-renamed. After removing those and I was able to restart my affected worker.