ASF GitHub Bot logged work on BEAM-8537:

                Author: ASF GitHub Bot
            Created on: 14/Feb/20 19:15
            Start Date: 14/Feb/20 19:15
    Worklog Time Spent: 10m 
      Work Description: boyuanzz commented on issue #10375: [BEAM-8537] Provide 
WatermarkEstimator to track watermark
URL: https://github.com/apache/beam/pull/10375#issuecomment-586429919
   @robertwb and @lukecwik, the PR is updated based on our discussion 
yesterday. PTAL : )
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Issue Time Tracking

    Worklog Id:     (was: 387624)
    Time Spent: 16h 40m  (was: 16.5h)

> Provide WatermarkEstimatorProvider for different types of WatermarkEstimator
> ----------------------------------------------------------------------------
>                 Key: BEAM-8537
>                 URL: https://issues.apache.org/jira/browse/BEAM-8537
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-py-core, sdk-py-harness
>            Reporter: Boyuan Zhang
>            Assignee: Boyuan Zhang
>            Priority: Major
>          Time Spent: 16h 40m
>  Remaining Estimate: 0h
> This is a follow up for in-progress PR:  
> https://github.com/apache/beam/pull/9794.
> Current implementation in PR9794 provides a default implementation of 
> WatermarkEstimator. For further work, we want to let WatermarkEstimator to be 
> a pure Interface. We'll provide a WatermarkEstimatorProvider to be able to 
> create a custom WatermarkEstimator per windowed value. It should be similar 
> to how we track restriction for SDF: 
> WatermarkEstimator <---> RestrictionTracker 
> WatermarkEstimatorProvider <---> RestrictionTrackerProvider
> WatermarkEstimatorParam <---> RestrictionDoFnParam

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