umustafi opened a new pull request, #3715:
URL: https://github.com/apache/gobblin/pull/3715

   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-1851 
   
   
   ### Description
   - [X] Here are some details about my PR, including screenshots (if 
applicable):
   Tests all cases of trying to acquire a lease for a flow action event with 
one participant involved and makes corresponding fixes in the 
`MultiActiveLeaseArbiter`. 
   
   - One key change this PR includes is to remove usage the participant's local 
`event_timestamp` in the database to identify the particular flow_action event. 
We swap it out for the database utilize the CURRENT_TIMESTAMP of the database 
to insert or keep track of our event. This is to avoid any discrepancies 
between local time and database time for future comparisons.
   - Large number of fixes relate to MySQL-specific bugs for example NULL 
values not being permitted by default, syntax errors in creation, inserting 
into a table with a create statement, etc...
   
   ### Tests
   - [X] My PR adds the following unit tests __OR__ does not need testing for 
this extremely good reason:
   Tests the following cases
   - CASE 1 of acquire lease for a flow action event not present in DB
   - CASE 2 of acquire lease for a flow action event that already has a valid 
lease for the same event in db
   - CASE 3 of trying to acquire a lease for a distinct flow action event, 
while the previous event's lease is valid
   - CASE 4 of lease out of date
   - CASE 5 of no longer leasing the same event in DB
   - CASE 6 of no longer leasing a distinct event in DB
   
   ### 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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