[GitHub] feng-tao commented on a change in pull request #3830: [AIRFLOW-2156] Parallelize Celery Executor

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feng-tao commented on a change in pull request #3830: [AIRFLOW-2156] Parallelize Celery Executor
URL: https://github.com/apache/incubator-airflow/pull/3830#discussion_r215092374
 
 

 ##########
 File path: airflow/executors/celery_executor.py
 ##########
 @@ -63,6 +69,40 @@ def execute_command(command):
         raise AirflowException('Celery command failed')
 
 
+class ExceptionWithTraceback(object):
+    """
+    Wrapper class used to propogate exceptions to parent processes from subprocesses.
+    :param exception: The exception to wrap
+    :type exception: Exception
+    :param traceback: The stacktrace to wrap
+    :type traceback: str
+    """
+
+    def __init__(self, exception, exception_traceback):
+        self.exception = exception
+        self.traceback = exception_traceback
+
+
+def fetch_celery_task_state(celery_task):
 
 Review comment:
   And do we retry to gather the task state?

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