[AIRFLOW-1837] Respect task start_date when different from dag's (#4010)

Currently task instances get created and scheduled based on the DAG's
start date rather than their own.  This commit adds a check before
creating a task instance to see that the start date is not after
the execution date.

airflow/models.py

@@ -5153,6 +5153,8 @@ def verify_integrity(self, session=None):
         for task in six.itervalues(dag.task_dict):
             if task.adhoc:
                 continue
+            if task.start_date > self.execution_date and not self.is_backfill:
+                continue
 
             if task.task_id not in task_ids:
                 ti = TaskInstance(task, self.execution_date)

tests/core.py

@@ -63,7 +63,7 @@
 from airflow.utils import timezone
 from airflow.utils.timezone import datetime
 from airflow.utils.state import State
-from airflow.utils.dates import infer_time_unit, round_time, scale_time_units
+from airflow.utils.dates import days_ago, infer_time_unit, round_time, scale_time_units
 from lxml import html
 from airflow.exceptions import AirflowException
 from airflow.configuration import AirflowConfigException, run_command
@@ -81,6 +81,7 @@
 DEFAULT_DATE_ISO = DEFAULT_DATE.isoformat()
 DEFAULT_DATE_DS = DEFAULT_DATE_ISO[:10]
 TEST_DAG_ID = 'unit_tests'
+EXAMPLE_DAG_DEFAULT_DATE = days_ago(2)
 
 try:
     import cPickle as pickle
@@ -1651,21 +1652,21 @@ def setUp(self):
 
         self.dagrun_python = self.dag_python.create_dagrun(
             run_id="test_{}".format(models.DagRun.id_for_date(timezone.utcnow())),
-            execution_date=DEFAULT_DATE,
+            execution_date=EXAMPLE_DAG_DEFAULT_DATE,
             start_date=timezone.utcnow(),
             state=State.RUNNING
         )
 
         self.sub_dag.create_dagrun(
             run_id="test_{}".format(models.DagRun.id_for_date(timezone.utcnow())),
-            execution_date=DEFAULT_DATE,
+            execution_date=EXAMPLE_DAG_DEFAULT_DATE,
             start_date=timezone.utcnow(),
             state=State.RUNNING
         )
 
         self.example_xcom.create_dagrun(
             run_id="test_{}".format(models.DagRun.id_for_date(timezone.utcnow())),
-            execution_date=DEFAULT_DATE,
+            execution_date=EXAMPLE_DAG_DEFAULT_DATE,
             start_date=timezone.utcnow(),
             state=State.RUNNING
         )
@@ -1758,7 +1759,7 @@ def test_dag_views(self):
         response = self.app.get(
             '/admin/airflow/task?'
             'task_id=runme_0&dag_id=example_bash_operator&'
-            'execution_date={}'.format(DEFAULT_DATE_DS))
+            'execution_date={}'.format(EXAMPLE_DAG_DEFAULT_DATE))
         self.assertIn("Attributes", response.data.decode('utf-8'))
         response = self.app.get(
             '/admin/airflow/dag_stats')
@@ -1770,22 +1771,21 @@ def test_dag_views(self):
             "/admin/airflow/success?task_id=print_the_context&"
             "dag_id=example_python_operator&upstream=false&downstream=false&"
             "future=false&past=false&execution_date={}&"
-            "origin=/admin".format(DEFAULT_DATE_DS))
+            "origin=/admin".format(EXAMPLE_DAG_DEFAULT_DATE))
         response = self.app.get(url)
         self.assertIn("Wait a minute", response.data.decode('utf-8'))
-        response = self.app.get(url + "&confirmed=true")
         response = self.app.get(
             '/admin/airflow/clear?task_id=print_the_context&'
             'dag_id=example_python_operator&future=true&past=false&'
             'upstream=true&downstream=false&'
             'execution_date={}&'
-            'origin=/admin'.format(DEFAULT_DATE_DS))
+            'origin=/admin'.format(EXAMPLE_DAG_DEFAULT_DATE))
         self.assertIn("Wait a minute", response.data.decode('utf-8'))
         url = (
             "/admin/airflow/success?task_id=section-1&"
             "dag_id=example_subdag_operator&upstream=true&downstream=true&"
             "future=false&past=false&execution_date={}&"
-            "origin=/admin".format(DEFAULT_DATE_DS))
+            "origin=/admin".format(EXAMPLE_DAG_DEFAULT_DATE))
         response = self.app.get(url)
         self.assertIn("Wait a minute", response.data.decode('utf-8'))
         self.assertIn("section-1-task-1", response.data.decode('utf-8'))
@@ -1799,7 +1799,7 @@ def test_dag_views(self):
             "dag_id=example_python_operator&future=false&past=false&"
             "upstream=false&downstream=true&"
             "execution_date={}&"
-            "origin=/admin".format(DEFAULT_DATE_DS))
+            "origin=/admin".format(EXAMPLE_DAG_DEFAULT_DATE))
         response = self.app.get(url)
         self.assertIn("Wait a minute", response.data.decode('utf-8'))
         response = self.app.get(url + "&confirmed=true")
@@ -1808,7 +1808,7 @@ def test_dag_views(self):
             "dag_id=example_subdag_operator.section-1&future=false&past=false&"
             "upstream=false&downstream=true&recursive=true&"
             "execution_date={}&"
-            "origin=/admin".format(DEFAULT_DATE_DS))
+            "origin=/admin".format(EXAMPLE_DAG_DEFAULT_DATE))
         response = self.app.get(url)
         self.assertIn("Wait a minute", response.data.decode('utf-8'))
         self.assertIn("example_subdag_operator.end",
@@ -1835,7 +1835,7 @@ def test_dag_views(self):
             "/admin/airflow/run?task_id=runme_0&"
             "dag_id=example_bash_operator&ignore_all_deps=false&ignore_ti_state=true&"
             "ignore_task_deps=true&execution_date={}&"
-            "origin=/admin".format(DEFAULT_DATE_DS))
+            "origin=/admin".format(EXAMPLE_DAG_DEFAULT_DATE))
         response = self.app.get(url)
         response = self.app.get(
             "/admin/airflow/refresh?dag_id=example_bash_operator")
@@ -1870,13 +1870,28 @@ def test_fetch_task_instance(self):
         url = (
             "/admin/airflow/object/task_instances?"
             "dag_id=example_python_operator&"
-            "execution_date={}".format(DEFAULT_DATE_DS))
+            "execution_date={}".format(EXAMPLE_DAG_DEFAULT_DATE))
         response = self.app.get(url)
         self.assertIn("print_the_context", response.data.decode('utf-8'))
 
+    def test_dag_view_task_with_python_operator_using_partial(self):
+        response = self.app.get(
+            '/admin/airflow/task?'
+            'task_id=test_dagrun_functool_partial&dag_id=test_task_view_type_check&'
+            'execution_date={}'.format(EXAMPLE_DAG_DEFAULT_DATE))
+        self.assertIn("A function with two args", response.data.decode('utf-8'))
+
+    def test_dag_view_task_with_python_operator_using_instance(self):
+        response = self.app.get(
+            '/admin/airflow/task?'
+            'task_id=test_dagrun_instance&dag_id=test_task_view_type_check&'
+            'execution_date={}'.format(EXAMPLE_DAG_DEFAULT_DATE))
+        self.assertIn("A __call__ method", response.data.decode('utf-8'))
+
     def tearDown(self):
         configuration.conf.set("webserver", "expose_config", "False")
-        self.dag_bash.clear(start_date=DEFAULT_DATE, end_date=timezone.utcnow())
+        self.dag_bash.clear(start_date=EXAMPLE_DAG_DEFAULT_DATE,
+                            end_date=timezone.utcnow())
         session = Session()
         session.query(models.DagRun).delete()
         session.query(models.TaskInstance).delete()

tests/dags/test_scheduler_dags.py

@@ -17,18 +17,34 @@
 # specific language governing permissions and limitations
 # under the License.
 
-from datetime import datetime
+from datetime import datetime, timedelta
 
 from airflow.models import DAG
 from airflow.operators.dummy_operator import DummyOperator
-DEFAULT_DATE = datetime(2100, 1, 1)
+DEFAULT_DATE = datetime(2016, 1, 1)
 
 # DAG tests backfill with pooled tasks
 # Previously backfill would queue the task but never run it
 dag1 = DAG(
     dag_id='test_start_date_scheduling',
-    start_date=datetime(2100, 1, 1))
+    start_date=datetime.utcnow() + timedelta(days=1))
 dag1_task1 = DummyOperator(
     task_id='dummy',
     dag=dag1,
     owner='airflow')
+
+dag2 = DAG(
+    dag_id='test_task_start_date_scheduling',
+    start_date=DEFAULT_DATE
+)
+dag2_task1 = DummyOperator(
+    task_id='dummy1',
+    dag=dag2,
+    owner='airflow',
+    start_date=DEFAULT_DATE + timedelta(days=3)
+)
+dag2_task2 = DummyOperator(
+    task_id='dummy2',
+    dag=dag2,
+    owner='airflow'
+)

tests/jobs.py

@@ -2209,7 +2209,7 @@ def test_scheduler_start_date(self):
         dag_id = 'test_start_date_scheduling'
         dag = self.dagbag.get_dag(dag_id)
         dag.clear()
-        self.assertTrue(dag.start_date > DEFAULT_DATE)
+        self.assertTrue(dag.start_date > datetime.datetime.utcnow())
 
         scheduler = SchedulerJob(dag_id,
                                  num_runs=2)
@@ -2244,6 +2244,27 @@ def test_scheduler_start_date(self):
         self.assertEqual(
             len(session.query(TI).filter(TI.dag_id == dag_id).all()), 1)
 
+    def test_scheduler_task_start_date(self):
+        """
+        Test that the scheduler respects task start dates that are different
+        from DAG start dates
+        """
+        dag_id = 'test_task_start_date_scheduling'
+        dag = self.dagbag.get_dag(dag_id)
+        dag.clear()
+        scheduler = SchedulerJob(dag_id,
+                                 num_runs=2)
+        scheduler.run()
+
+        session = settings.Session()
+        tiq = session.query(TI).filter(TI.dag_id == dag_id)
+        ti1s = tiq.filter(TI.task_id == 'dummy1').all()
+        ti2s = tiq.filter(TI.task_id == 'dummy2').all()
+        self.assertEqual(len(ti1s), 0)
+        self.assertEqual(len(ti2s), 2)
+        for t in ti2s:
+            self.assertEqual(t.state, State.SUCCESS)
+
     def test_scheduler_multiprocessing(self):
         """
         Test that the scheduler can successfully queue multiple dags in parallel

tests/www_rbac/test_views.py

@@ -40,7 +40,7 @@
 from airflow.models import DAG, DagRun, TaskInstance
 from airflow.operators.dummy_operator import DummyOperator
 from airflow.settings import Session
-from airflow.utils import timezone
+from airflow.utils import dates, timezone
 from airflow.utils.state import State
 from airflow.utils.timezone import datetime
 from airflow.www_rbac import app as application
@@ -263,8 +263,8 @@ def test_mount(self):
 
 
 class TestAirflowBaseViews(TestBase):
-    default_date = timezone.datetime(2018, 3, 1)
-    run_id = "test_{}".format(models.DagRun.id_for_date(default_date))
+    EXAMPLE_DAG_DEFAULT_DATE = dates.days_ago(2)
+    run_id = "test_{}".format(models.DagRun.id_for_date(EXAMPLE_DAG_DEFAULT_DATE))
 
     def setUp(self):
         super(TestAirflowBaseViews, self).setUp()
@@ -291,19 +291,19 @@ def prepare_dagruns(self):
 
         self.bash_dagrun = self.bash_dag.create_dagrun(
             run_id=self.run_id,
-            execution_date=self.default_date,
+            execution_date=self.EXAMPLE_DAG_DEFAULT_DATE,
             start_date=timezone.utcnow(),
             state=State.RUNNING)
 
         self.sub_dagrun = self.sub_dag.create_dagrun(
             run_id=self.run_id,
-            execution_date=self.default_date,
+            execution_date=self.EXAMPLE_DAG_DEFAULT_DATE,
             start_date=timezone.utcnow(),
             state=State.RUNNING)
 
         self.xcom_dagrun = self.xcom_dag.create_dagrun(
             run_id=self.run_id,
-            execution_date=self.default_date,
+            execution_date=self.EXAMPLE_DAG_DEFAULT_DATE,
             start_date=timezone.utcnow(),
             state=State.RUNNING)
 
@@ -321,19 +321,19 @@ def test_home(self):
 
     def test_task(self):
         url = ('task?task_id=runme_0&dag_id=example_bash_operator&execution_date={}'
-               .format(self.percent_encode(self.default_date)))
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
         resp = self.client.get(url, follow_redirects=True)
         self.check_content_in_response('Task Instance Details', resp)
 
     def test_xcom(self):
         url = ('xcom?task_id=runme_0&dag_id=example_bash_operator&execution_date={}'
-               .format(self.percent_encode(self.default_date)))
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
         resp = self.client.get(url, follow_redirects=True)
         self.check_content_in_response('XCom', resp)
 
     def test_rendered(self):
         url = ('rendered?task_id=runme_0&dag_id=example_bash_operator&execution_date={}'
-               .format(self.percent_encode(self.default_date)))
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
         resp = self.client.get(url, follow_redirects=True)
         self.check_content_in_response('Rendered Template', resp)
 
@@ -400,25 +400,32 @@ def test_paused(self):
         resp = self.client.post(url, follow_redirects=True)
         self.check_content_in_response('OK', resp)
 
+    def test_failed(self):
+        url = ('failed?task_id=run_this_last&dag_id=example_bash_operator&'
+               'execution_date={}&upstream=false&downstream=false&future=false&past=false'
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
+        resp = self.client.get(url)
+        self.check_content_in_response('Wait a minute', resp)
+
     def test_success(self):
 
         url = ('success?task_id=run_this_last&dag_id=example_bash_operator&'
                'execution_date={}&upstream=false&downstream=false&future=false&past=false'
-               .format(self.percent_encode(self.default_date)))
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
         resp = self.client.get(url)
         self.check_content_in_response('Wait a minute', resp)
 
     def test_clear(self):
         url = ('clear?task_id=runme_1&dag_id=example_bash_operator&'
                'execution_date={}&upstream=false&downstream=false&future=false&past=false'
-               .format(self.percent_encode(self.default_date)))
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
         resp = self.client.get(url)
         self.check_content_in_response(['example_bash_operator', 'Wait a minute'], resp)
 
     def test_run(self):
         url = ('run?task_id=runme_0&dag_id=example_bash_operator&ignore_all_deps=false&'
                'ignore_ti_state=true&execution_date={}'
-               .format(self.percent_encode(self.default_date)))
+               .format(self.percent_encode(self.EXAMPLE_DAG_DEFAULT_DATE)))
         resp = self.client.get(url)
         self.check_content_in_response('', resp, resp_code=302)