Make sure you have checked _all_ steps below. ### Jira
- [ ] My PR addresses the following [AIRFLOW-3136](https://issues.apache.org/jira/browse/AIRFLOW-3136) issues and references them in the PR title. ### Description - [ ] Here are some details about my PR. We were seeing an intermittent issue where executor reports task instance finished while task says it's in queue state, it was due to a race condition between scheduler which was clearing event_buffer in _process_executor_events method in jobs.py executor was about to put next_retry task's status as running which was failed in previous try. So, we thought to add retry_number as the member of TaskInstance key property. ### Tests - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: ### Commits - [ ] 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 - [ ] 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 - [ ] Passes `git diff upstream/master -u -- "*.py" | flake8 --diff` [ Full content available at: https://github.com/apache/incubator-airflow/pull/3994 ] This message was relayed via gitbox.apache.org for [email protected]
