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https://issues.apache.org/jira/browse/AIRFLOW-1017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15937276#comment-15937276
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ASF subversion and git services commented on AIRFLOW-1017:
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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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