[GitHub] [airflow] ashb opened a new pull request #6284: [AIRFLOW-5102] Worker jobs should terminate themselves if they can't heartbeat

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ashb opened a new pull request #6284: [AIRFLOW-5102] Worker jobs should terminate themselves if they can't heartbeat
URL: https://github.com/apache/airflow/pull/6284
 
 
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   ### Jira
   
   - [x] https://issues.apache.org/jira/browse/AIRFLOW-5102
   
   ### Description
   
   - [x] If a LocalTaskJob fails to heartbeat for scheduler_zombie_task_threshold, it should shut itself down.
   
     However, at some point, a change was made to catch exceptions inside the heartbeat, so the LocalTaskJob thought it had managed to heartbeat successfully.
   
     This effectively means that zombie tasks don't shut themselves down. When the scheduler reschedules the job, this means we could have two instances of the task running concurrently.
   
   ### Tests
   
   - [x] I have added tests to ensure that `self.latest_heartbeat` is only updated when the DB is updated.
   
   ### 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] None

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