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https://issues.apache.org/jira/browse/AIRFLOW-2777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16558761#comment-16558761
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ASF subversion and git services commented on AIRFLOW-2777:
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Commit 4cd72b91bd024e6be9abb30aee345c0a90a6561b in incubator-airflow's branch
refs/heads/master from [~abdul-stripe]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-airflow.git;h=4cd72b9 ]
[AIRFLOW-2777] speed up dag.sub_dag(...)
previous version created the subdag by copying
over all the tasks, and
then filtering them down. it's a lot faster if we
only copy over the
tasks we need
Closes #3621 from abdul-stripe/faster-subdag
> dag.sub_dag(...) speedups
> -------------------------
>
> Key: AIRFLOW-2777
> URL: https://issues.apache.org/jira/browse/AIRFLOW-2777
> Project: Apache Airflow
> Issue Type: Improvement
> Reporter: Abdul Nimeri
> Assignee: Abdul Nimeri
> Priority: Minor
> Fix For: 2.0.0
>
>
> dag.sub_dag(...) currently works by first deep copying the entire dag, and
> then filtering down to the appropriate tasks. that can be slow since deep
> copying a big dag takes a while. specifically, copying over all the tasks is
> the bottleneck
> this can be a lot faster by instead only copying over the filtered down tasks
>
>
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