[jira] [Commented] (AIRFLOW-1017) get_task_instance should return None instead of throw an exception for non-existent TIs

["ASF subversion and git services (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937276#comment-15937276 ] 

ASF subversion and git services commented on AIRFLOW-1017:
----------------------------------------------------------

Commit b2b9587cca9195229ab107394ad94b7702c70e37 in incubator-airflow's branch refs/heads/master from [~aoen]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-airflow.git;h=b2b9587 ]

[AIRFLOW-1017] get_task_instance shouldn't throw exception when no TI

get_task_instance should return None instead of
throwing exception in the case where dagrun does not have the task
instance.

Closes #2178 from aoen/ddavydov--
one_instead_of_first_for_dagrun


> get_task_instance should return None instead of throw an exception for non-existent TIs
> ---------------------------------------------------------------------------------------
>
>                 Key: AIRFLOW-1017
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1017
>             Project: Apache Airflow
>          Issue Type: Bug
>            Reporter: Dan Davydov
>            Assignee: Dan Davydov
>            Priority: Critical
>
> We were seeing errors in our scheduler like the following due to this issue:
>   File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/orm/query.py", line 2796, in one
>     raise orm_exc.NoResultFound("No row was found for one()")



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