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https://issues.apache.org/jira/browse/BEAM-71?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Luke Cwik resolved BEAM-71.
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Fix Version/s: 2.22.0
Resolution: Fixed
As part of the SplittableDoFn work, several estimators have been added to
[WatermarkEstimators|https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/splittabledofn/WatermarkEstimators.java]
> Watermark library
> -----------------
>
> Key: BEAM-71
> URL: https://issues.apache.org/jira/browse/BEAM-71
> Project: Beam
> Issue Type: New Feature
> Components: sdk-java-core
> Reporter: Dan Halperin
> Assignee: Tarush Grover
> Priority: P2
> Labels: Watermark, stale-assigned
> Fix For: 2.22.0
>
>
> See also: BEAM-70
> We should have a library of watermark implementations:
> * now: for when items use arrival timestamps
> * latest element: for when events arrive in timestamp order
> * moving average over last K time intervals
> * bucketed moving average, ...
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