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

["Daniel Imberman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AIRFLOW-174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Imberman reassigned AIRFLOW-174:
---------------------------------------

    Assignee: Daniel Imberman  (was: Bolke de Bruin)

> 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: 1.7.1
>            Reporter: Jeremiah Lowin
>            Assignee: Daniel Imberman
>            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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