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Posted to commits@airflow.apache.org by "Ash Berlin-Taylor (Jira)" <ji...@apache.org> on 2019/10/14 10:33:00 UTC

[jira] [Commented] (AIRFLOW-5639) DagFileProcessor: parse dag files every time, which consume lots of resources and is unnecessary

    [ https://issues.apache.org/jira/browse/AIRFLOW-5639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16950888#comment-16950888 ] 

Ash Berlin-Taylor commented on AIRFLOW-5639:
--------------------------------------------

As you say, right now we need to do this, but we are working towards making this not needed.

> DagFileProcessor: parse dag files every time, which consume lots of resources and is unnecessary
> ------------------------------------------------------------------------------------------------
>
>                 Key: AIRFLOW-5639
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5639
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: scheduler
>    Affects Versions: 1.10.5
>            Reporter: chen xianxin
>            Priority: Major
>
>  
> h2. Code
> [https://github.com/apache/airflow/blob/v1-10-stable/airflow/models/dagbag.py#L166-L170]
> h2. Problem description 
> *self.file_last_changed* doesn't work, beacause it's set to empty when Dagbag is initialized. so even no changes were made to the file, it will also be imported. I have sure this problem by print log.
> Generate bagdags from files take about 50% time of dag files processing, if only generate bagdags when files are changed,  lots of resources will be saved.



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