umustafi opened a new pull request, #3790:
URL: https://github.com/apache/gobblin/pull/3790

   Dear Gobblin maintainers,
   
   Please accept this PR. I understand that it will not be reviewed until I 
have checked off all the steps below!
   
   
   ### JIRA
   - [X] My PR addresses the following [Gobblin 
JIRA](https://issues.apache.org/jira/browse/GOBBLIN/) issues and references 
them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
       - https://issues.apache.org/jira/browse/GOBBLIN-1921
   
   
   ### Description
   - [X] Here are some details about my PR, including screenshots (if 
applicable):
   Reminder flow trigger events were being improperly handled and interpreted 
as new events because they are triggered linger time after the original trigger 
where epsilon < linger and we use epsilon to determine event distinctness. With 
reminder events being considered distinct events, we were launching excess 
concurrent flows that were then being cancelled. Now we handle reminder events 
differently from normal event triggers to ensure they're properly evaluated. 
Because of db laundering, reminder events are easy to handle - if they're older 
than the currently worked upon event in the database they can be skipped and if 
they're equal to the current event in the database they are handled like 
normal. Reminder events should never be newer than the current event in the 
lease arbiter table because db laundering always results in increasing event 
times. 
   
   ### Tests
   - [X] My PR adds the following unit tests __OR__ does not need testing for 
this extremely good reason:
   Updates existing unit tests 
   TODO: adding tests to handle reminder events 
   
   ### 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
       2. Subject is limited to 50 characters
       3. Subject does not end with a period
       4. Subject uses the imperative mood ("add", not "adding")
       5. Body wraps at 72 characters
       6. Body explains "what" and "why", not "how"
   
   


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