ashb commented on a change in pull request #3873: [Airflow-2760] Decouple DAG 
parsing loop from scheduler loop
URL: https://github.com/apache/incubator-airflow/pull/3873#discussion_r219588160
 
 

 ##########
 File path: airflow/jobs.py
 ##########
 @@ -579,26 +583,27 @@ def __init__(
 
         self.using_sqlite = False
         if 'sqlite' in conf.get('core', 'sql_alchemy_conn'):
-            if self.max_threads > 1:
-                self.log.error("Cannot use more than 1 thread when using 
sqlite. Setting max_threads to 1")
-            self.max_threads = 1
             self.using_sqlite = True
 
-        # How often to scan the DAGs directory for new files. Default to 5 
minutes.
-        self.dag_dir_list_interval = conf.getint('scheduler',
-                                                 'dag_dir_list_interval')
-        # How often to print out DAG file processing stats to the log. Default 
to
-        # 30 seconds.
-        self.print_stats_interval = conf.getint('scheduler',
-                                                'print_stats_interval')
-
-        self.file_process_interval = file_process_interval
-
         self.max_tis_per_query = conf.getint('scheduler', 'max_tis_per_query')
         if run_duration is None:
             self.run_duration = conf.getint('scheduler',
                                             'run_duration')
 
+        self.processor_agent = None
+
+        signal.signal(signal.SIGINT, self._exit_gracefully)
+        signal.signal(signal.SIGTERM, self._exit_gracefully)
+
+    def _exit_gracefully(self, signum, frame):
+        """
+        Helper method to clean up processor_agent to avoid leaving orphan 
processes.
+        """
+        self.log.info("Exiting gracefully with signal {}".format(signum))
 
 Review comment:
   Nit: `"Exiting gracefully after receiving signal {}"` please

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