jgrier opened a new pull request #7099: [FLINK-10887] [jobmaster] Add source 
watermark tracking to the JobMaster
URL: https://github.com/apache/flink/pull/7099
 
 
   ## What is the purpose of the change
   
   This commit adds a JobMaster RPC endpoint that is used to share information 
across source subtasks regarding event time progress.
   
   This will be used implement event time source synchronization across sources.
   
   ## Brief change log
     - New RPC endpoint on JobMaster to track event time progress across source 
sub-tasks
     - Updated JobMaster Tests
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
     - Added testCase to ensure watermark stats are computed correctly to 
JobMasterTest
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): No
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: No
     - The serializers: No
     - The runtime per-record code paths (performance sensitive): No
     - Anything that affects deployment or recovery: No
     - The S3 file system connector: No
   
   ## Documentation
   
     - Does this pull request introduce a new feature? No
     - If yes, how is the feature documented? not applicable
   

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