Will-Lo opened a new pull request, #3612:
URL: https://github.com/apache/gobblin/pull/3612

   …ime as the FSFlowGraph if their files are updated at the same time as the 
flowgraph monitor
   
   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-1752
   
   ### Description
   - [x] Here are some details about my PR, including screenshots (if 
applicable):
   
   `FSFlowGraphMonitor` and the `ObservingFsFlowTemplateCatalog` have a race 
condition if they are updated at the same time, the FSFlowGraphMonitor will not 
reload itself and can be put into a bad state where there are jobs or edges 
that are incomplete due to deleting the cache mid-update.
   
   Instead, we should have `FSFlowGraphMonitor` control the updates to both the 
flowgraph and the templateCatalog through a configuration 
`gobblin.service.fsFlowGraphMonitor.monitorTemplateChanges`, which assumes that 
the templateCatalog is colocated with the flowgraph in the same parent folder.
   
   ### Tests
   - [x] My PR adds the following unit tests __OR__ does not need testing for 
this extremely good reason:
   
   
   ### 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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