Siddharth Anand created AIRFLOW-989:
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Summary: Clear Task Regression
Key: AIRFLOW-989
URL: https://issues.apache.org/jira/browse/AIRFLOW-989
Project: Apache Airflow
Issue Type: Bug
Components: core
Affects Versions: Airflow 1.8
Reporter: Siddharth Anand
Priority: Critical
There is a regression in the current 1.8 rc (e.g. rc5) related to Clear Task
behavior.
Consider the following test DAG :
https://gist.github.com/r39132/b44f7d791e11f882cde28a219df97c29
The test DAG has 4 dummy tasks chained together as d1->d2->d3->d4. d1 is the
first task and d4 is the last task.
Prior to 1.8, if any of d1..d4 were cleared individually. the scheduler would
pick up and rerun the cleared tasks.
In 1.8. unless the last task in a DAG is cleared, none of the tasks in the DAG
run are rerun.
In order for a task that is not the last task in the DAG to be rerun after
being cleared, its terminal downstream task needs to be cleared. Another
workaround is to use the CLI to rerun the cleared task.
Here are some screenshots to illustrate the regressed behavior:
Use Case 1 : Clear d1, d2, d3, and d4 in 4 separate DAG runs. In a 5th separate
DAG run, clear the entire DAG Run.
After Clearing :
https://www.dropbox.com/s/mgiwoyaxf5f2pb2/Screenshot%202017-03-15%2010.12.02.png?dl=0
After the Scheduler Runs :
https://www.dropbox.com/s/7btwzydv87v3iz0/Screenshot%202017-03-15%2010.15.16.png?dl=0
You'll notice that only the DAG runs with the last task cleared completed by
actually running cleared tasks. These are shown as the 1st and 5th DAG runs
from the left.
Use Case 2 : Clear d1 and d4 in the same DAG Run
After Clearing (c.f. 2nd from right DAG run):
https://www.dropbox.com/s/2a6by6k28eb7geh/Screenshot%202017-03-15%2013.34.11.png?dl=0
After the Scheduler Runs :
https://www.dropbox.com/s/19cg6qr2oqi1ps7/Screenshot%202017-03-15%2013.34.51.png?dl=0
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