milton0825 commented on a change in pull request #5128: [AIRFLOW-4307] Backfill
respects concurrency limit
URL: https://github.com/apache/airflow/pull/5128#discussion_r277119184
##########
File path: tests/test_jobs.py
##########
@@ -308,6 +308,37 @@ def test_backfill_conf(self):
self.assertEqual(conf, dr[0].conf)
+ def test_backfill_respect_concurrency_limit(self):
+
+ dag = self._get_dummy_dag('test_backfill_respect_concurrency_limit')
+ dag.concurrency = 2
+
+ executor = TestExecutor(do_update=True)
+
+ job = BackfillJob(
+ dag=dag,
+ executor=executor,
+ start_date=DEFAULT_DATE,
+ end_date=DEFAULT_DATE + datetime.timedelta(days=7),
+ )
+
+ job.run()
+
+ self.assertTrue(0 < len(executor.history))
+
+ concurrency_limit_reached_at_least_once = False
+
+ running_tis_total = 0
+
+ for running_tis in executor.history:
+ self.assertLessEqual(len(running_tis), dag.concurrency)
+ running_tis_total += len(running_tis)
+ if len(running_tis) == dag.concurrency:
+ concurrency_limit_reached_at_least_once = True
+
+ self.assertEquals(8, running_tis_total)
+ self.assertTrue(concurrency_limit_reached_at_least_once)
+
Review comment:
Agree. I have updated the tests to inspect `log.debug` and verify that we
are hitting the right threshold.
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