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https://issues.apache.org/jira/browse/AIRFLOW-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16639890#comment-16639890
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ASF GitHub Bot commented on AIRFLOW-3160:
-----------------------------------------
aoen opened a new pull request #4005: [AIRFLOW-3160] Load latest_dagruns
asynchronously
URL: https://github.com/apache/incubator-airflow/pull/4005
Make sure you have checked _all_ steps below.
### Jira
- [X] My PR addresses the following [Airflow
Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references
them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
- https://issues.apache.org/jira/browse/AIRFLOW-XXX
- In case you are fixing a typo in the documentation you can prepend your
commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
### Description
The front page loads very slowly when the DB has latency because one
blocking query is made per DAG against the DB. Even if we were to add indexes,
the queries should still be batched to avoid an overhead of RTT * # of DAGs.
The latest dagruns should be loaded asynchronously and in batch like the
other UI elements that query the database.
- [X] Here are some details about my PR, including screenshots of any UI
changes:
### Tests
- [X] My PR adds the following unit tests __OR__ does not need testing for
this extremely good reason:
UI changes only.
### Commits
- [X] My commits all reference Jira issues in their subject lines, and I
have squashed multiple commits if they address the same issue. In addition, my
commits follow the guidelines from "[How to write a good git commit
message](http://chris.beams.io/posts/git-commit/)":
1. Subject is separated from body by a blank line
1. Subject is limited to 50 characters (not including Jira issue reference)
1. Subject does not end with a period
1. Subject uses the imperative mood ("add", not "adding")
1. Body wraps at 72 characters
1. Body explains "what" and "why", not "how"
### Documentation
- [X] In case of new functionality, my PR adds documentation that describes
how to use it.
- When adding new operators/hooks/sensors, the autoclass documentation
generation needs to be added.
### Code Quality
- [X] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
cc @ashb
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> Load latest_dagruns asynchronously
> -----------------------------------
>
> Key: AIRFLOW-3160
> URL: https://issues.apache.org/jira/browse/AIRFLOW-3160
> Project: Apache Airflow
> Issue Type: Improvement
> Components: webserver
> Affects Versions: 1.10.0
> Reporter: Dan Davydov
> Assignee: Dan Davydov
> Priority: Major
>
> The front page loads very slowly when the DB has latency because one blocking
> query is made per DAG against the DB.
>
> The latest dagruns should be loaded asynchronously and in batch like the
> other UI elements that query the database.
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