[jira] [Commented] (AIRFLOW-5096) reduce the number of times the pickle is inserted into the database by modifying the hash field of Dag

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-5096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16965592#comment-16965592 ] 

ASF GitHub Bot commented on AIRFLOW-5096:
-----------------------------------------

MeiK2333 commented on pull request #5709: [AIRFLOW-5096] use modification time replace last loaded time, reduce database insert
URL: https://github.com/apache/airflow/pull/5709
 
 
   
 
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> reduce the number of times the pickle is inserted into the database by modifying the hash field of Dag
> ------------------------------------------------------------------------------------------------------
>
>                 Key: AIRFLOW-5096
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-5096
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: DAG
>    Affects Versions: 1.10.3
>            Reporter: MeiK
>            Assignee: MeiK
>            Priority: Major
>
> After the scheduler has the --do_pickle option turned on, the scheduler will insert all the file pickles into the database each time it scans the file, which will cause the database to swell rapidly.
> In my opinion, the main reason is because the hash function that determines whether the dag is the same as the pickle version uses the last_loaded field, which changes every time it is read instead of modified. Therefore, airflow inserts a large amount of unchanging data into the database.
> I created a commit in which the last modified time of the file was used instead of last_loaded as the hash field, which works fine on my computer. Please let me know if you have a better way.
> English is not my native language; please excuse typing errors.



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