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From "Bolke de Bruin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AIRFLOW-214) TaskInstance can get detached in process_dag
Date Mon, 06 Jun 2016 19:30:21 GMT
Bolke de Bruin created AIRFLOW-214:
--------------------------------------

             Summary: TaskInstance can get detached in process_dag
                 Key: AIRFLOW-214
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-214
             Project: Apache Airflow
          Issue Type: Bug
          Components: scheduler
            Reporter: Bolke de Bruin
             Fix For: Airflow 1.8


Is some rare occasions the TaskInstance can get detached in process_dag. It is unclear why

{code}[2016-06-06 17:47:37,048] {models.py:3444} INFO - Updating state for <DagRun example_skip_dag
@ 2016-06-05 00:00:00: scheduled__2016-06-05T00:00:00, externally triggered: False> considering
8 task(s)
[2016-06-06 17:47:37,059] {jobs.py:670} ERROR - Instance <TaskInstance at 0x10d3e9410>
is not bound to a Session; attribute refresh operation cannot proceed
Traceback (most recent call last):
  File "/Users/bolke/Documents/dev/airflow_env/lib/python2.7/site-packages/airflow-1.7.1.2-py2.7.egg/airflow/jobs.py",
line 667, in _do_dags
    self.process_dag(dag, tis_out)
  File "/Users/bolke/Documents/dev/airflow_env/lib/python2.7/site-packages/airflow-1.7.1.2-py2.7.egg/airflow/jobs.py",
line 531, in process_dag
    task = dag.get_task(ti.task_id)
  File "/Users/bolke/Documents/dev/airflow_env/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py",
line 237, in __get__
    return self.impl.get(instance_state(instance), dict_)
  File "/Users/bolke/Documents/dev/airflow_env/lib/python2.7/site-packages/sqlalchemy/orm/attributes.py",
line 578, in get
    value = state._load_expired(state, passive)
  File "/Users/bolke/Documents/dev/airflow_env/lib/python2.7/site-packages/sqlalchemy/orm/state.py",
line 474, in _load_expired
    self.manager.deferred_scalar_loader(self, toload)
  File "/Users/bolke/Documents/dev/airflow_env/lib/python2.7/site-packages/sqlalchemy/orm/loading.py",
line 610, in load_scalar_attributes
    (state_str(state)))
DetachedInstanceError: Instance <TaskInstance at 0x10d3e9410> is not bound to a Session;
attribute refresh operation cannot proceed{code}



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