[jira] [Created] (BEAM-8478) Create WatermarkEstomator for tracking watermark

[Boyuan Zhang (Jira)]

Boyuan Zhang created BEAM-8478:
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             Summary: Create WatermarkEstomator for tracking watermark
                 Key: BEAM-8478
                 URL: https://issues.apache.org/jira/browse/BEAM-8478
             Project: Beam
          Issue Type: Improvement
          Components: sdk-py-core, sdk-py-harness
            Reporter: Boyuan Zhang
            Assignee: Boyuan Zhang


Instead of tracking watermark in RestrictionTracker, use a WatermarkEstimator 
instead.



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