[GitHub] [airflow] kaxil commented on a change in pull request #15112: Avoid scheduler/parser manager deadlock by using non-blocking IO

[GitBox <gi...@apache.org>]

kaxil commented on a change in pull request #15112:
URL: https://github.com/apache/airflow/pull/15112#discussion_r605026425



##########
File path: tests/utils/test_dag_processing.py
##########
@@ -521,17 +521,97 @@ def test_dag_with_system_exit(self):
 
         manager._run_parsing_loop()
 
+        result = None
         while parent_pipe.poll(timeout=None):
             result = parent_pipe.recv()
             if isinstance(result, DagParsingStat) and result.done:
                 break
 
         # Three files in folder should be processed
-        assert len(result.file_paths) == 3
+        assert result.num_file_paths == 3
 
         with create_session() as session:
             assert session.query(DagModel).get(dag_id) is not None
 
+    @conf_vars({('core', 'load_examples'): 'False'})
+    @pytest.mark.backend("mysql", "postgres")
+    def test_pipe_full_deadlock(self):
+        import threading
+
+        dag_filepath = TEST_DAG_FOLDER / "test_scheduler_dags.py"
+
+        child_pipe, parent_pipe = multiprocessing.Pipe()
+
+        import socket

Review comment:
       Should we move the imports at the top of the file or are they intentionally here?




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