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https://issues.apache.org/jira/browse/AIRFLOW-5210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16907254#comment-16907254
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ASF subversion and git services commented on AIRFLOW-5210:
----------------------------------------------------------

Commit eeac82318a6440b2d65f9a35b3437b91813945f4 in airflow's branch 
refs/heads/master from Daniel Frank
[ https://gitbox.apache.org/repos/asf?p=airflow.git;h=eeac823 ]

[AIRFLOW-5210] Make finding template files more efficient (#5815)

For large DAGs, iterating over template fields to find template files can be 
time intensive.
Save this time for tasks that do not specify a template file extension.

> Resolving Template Files for large DAGs hurts performance 
> ----------------------------------------------------------
>
>                 Key: AIRFLOW-5210
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5210
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: DAG
>    Affects Versions: 1.10.4
>            Reporter: Daniel Frank
>            Priority: Major
>
> During task execution,  "resolve_template_files" runs for all tasks in a 
> given DAG. For large DAGs this takes a long time and is not necessary for 
> tasks that do not use the template_ext field 



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