Boyuan Zhang created BEAM-9312:
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             Summary: Make MonotonicWatermarkEstimator configurable for whether 
to ignore late timestamp.
                 Key: BEAM-9312
                 URL: https://issues.apache.org/jira/browse/BEAM-9312
             Project: Beam
          Issue Type: Improvement
          Components: sdk-py-core, sdk-py-harness
            Reporter: Boyuan Zhang


Current implementation of MonotonicWatermarkEstimator throws error and stop the 
pipeline  when there is a late timestamp. But there are more potential options 
like:
(1) Suppress the error and emit the item as possibly late data.
(2) Move the timestamp forward to respect the watermark.
We should consider making MonotonicWatermarkEstimator configurable with these 
options, or  providing different types of MonotonicWatermarkEstimator  to 
handle different options.



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