[jira] [Created] (AIRFLOW-174) Add --debug option to scheduler

["Jeremiah Lowin (JIRA)" <ji...@apache.org>]

Jeremiah Lowin created AIRFLOW-174:
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             Summary: Add --debug option to scheduler
                 Key: AIRFLOW-174
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-174
             Project: Apache Airflow
          Issue Type: Improvement
          Components: scheduler
    Affects Versions: Airflow 1.7.1
            Reporter: Jeremiah Lowin
            Assignee: Bolke de Bruin
            Priority: Minor


{{airflow webserver}} has a {{--debug}} param which enables the use of interactive debuggers like {{ipdb}} (among other side effects). Unfortunately the {{airflow scheduler}} process does not respect debugger instructions, which makes tracing errors very difficult. It just prints the following error and resumes operation:
{code}
Traceback (most recent call last):
  File "/Users/jlowin/git/airflow/airflow/jobs.py", line 690, in _do_dags
    self.process_dag(dag, tis_out)
  File "/Users/jlowin/git/airflow/airflow/jobs.py", line 521, in process_dag
    run.update_state()
  File "/Users/jlowin/git/airflow/airflow/utils/db.py", line 53, in wrapper
    result = func(*args, **kwargs)
  File "/Users/jlowin/git/airflow/airflow/models.py", line 3471, in update_state
    all_deadlocked = (has_unfinished_tasks and no_dependencies_met)
  File "/Users/jlowin/git/airflow/airflow/models.py", line 3471, in update_state
    all_deadlocked = (has_unfinished_tasks and no_dependencies_met)
  File "/Users/jlowin/anaconda3/lib/python3.5/bdb.py", line 48, in trace_dispatch
    return self.dispatch_line(frame)
  File "/Users/jlowin/anaconda3/lib/python3.5/bdb.py", line 67, in dispatch_line
    if self.quitting: raise BdbQuit
bdb.BdbQuit
{code}

 [~bolke] I'm assigning this to you for now because I suspect it's related to the subprocess/daemonizing changes you made though I'm not sure. If we can enable {{ipdb}} it will make future scheduler work so much easier!



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