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From "John Arnold (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AIRFLOW-2319) Table "dag_run" has (bad) second index on (dag_id, execution_date)
Date Thu, 19 Apr 2018 19:13:00 GMT

    [ https://issues.apache.org/jira/browse/AIRFLOW-2319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16444653#comment-16444653
] 

John Arnold commented on AIRFLOW-2319:
--------------------------------------

IMO, the index is probably needed for performance, as those are the most common lookup fields
etc.  I would add the index to the model as a bugfix.

> Table "dag_run" has (bad) second index on (dag_id, execution_date)
> ------------------------------------------------------------------
>
>                 Key: AIRFLOW-2319
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-2319
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: DagRun
>    Affects Versions: 1.9.0
>            Reporter: Andreas Költringer
>            Priority: Major
>
> Inserting DagRun's via {{airflow.api.common.experimental.trigger_dag}} (multiple rows
with the same {{(dag_id, execution_date)}}) raised the following error:
> {code:java}
> {models.py:1644} ERROR - No row was found for one(){code}
> This is weird as the {{session.add()}} and {{session.commit()}} is right before {{run.refresh_from_db()}}
in {{models.DAG.create_dagrun()}}.
> Manually inspecting the database revealed that there is an extra index with {{unique}}
constraint on the columns {{(dag_id, execution_date)}}:
> {code:java}
> sqlite> .schema dag_run
> CREATE TABLE dag_run (
>         id INTEGER NOT NULL, 
>         dag_id VARCHAR(250), 
>         execution_date DATETIME, 
>         state VARCHAR(50), 
>         run_id VARCHAR(250), 
>         external_trigger BOOLEAN, conf BLOB, end_date DATETIME, start_date DATETIME,

>         PRIMARY KEY (id), 
>         UNIQUE (dag_id, execution_date), 
>         UNIQUE (dag_id, run_id), 
>         CHECK (external_trigger IN (0, 1))
> );
> CREATE INDEX dag_id_state ON dag_run (dag_id, state);{code}
> (On SQLite its a unique constraint, on MariaDB its also an index)
> The {{DagRun}} class in {{models.py}} does not reflect this, however it is in [migrations/versions/1b38cef5b76e_add_dagrun.py|https://github.com/apache/incubator-airflow/blob/master/airflow/migrations/versions/1b38cef5b76e_add_dagrun.py#L42]
> I looked for other migrations correting this, but could not find any. As this is not
reflected in the model, I guess this is a bug?



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