Debugging djcelery's celeryd via pdb

Question

Have anybody tried debugging celeryd worker using pdb? Whenever a breakpoint is encountered (either by running celeryd via pdb, or by pdb.set_trace()), I hit the following error:

Error while handling action event. Traceback (most recent call last):   File "/home/jeeyo/workspace3/uwcr/subscriptions/tasks.py", line 79, in process_action_event     func(action_event)   File "/home/jeeyo/workspace3/uwcr/subscriptions/tasks.py", line 36, in new_user_email     send_registration_email(username, new_user.get_profile().plaintext_password)   File "/home/jeeyo/workspace3/uwcr/looers/email.py", line 18, in send_registration_email     'Your password from UWCoopRankings', user   File "/home/jeeyo/workspace3/uwcr/looers/email.py", line 61, in send_email     if isinstance(to, basestring):   File "/home/jeeyo/workspace3/uwcr/looers/email.py", line 61, in send_email     if isinstance(to, basestring):   File "/usr/lib/python2.6/bdb.py", line 46, in trace_dispatch     return self.dispatch_line(frame)   File "/usr/lib/python2.6/bdb.py", line 65, in dispatch_line     if self.quitting: raise BdbQuit BdbQuit 

Any solution to this?

Answer 1

I had the same problem. Try using Celery's remote debugger rdb instead:

from celery import task from celery.contrib import rdb  @task() def add(x, y):     result = x + y     rdb.set_trace()  # <- set break-point     return result 

See the user guide (link update 2017/5).