ASF GitHub Bot logged work on BEAM-3776:

                Author: ASF GitHub Bot
            Created on: 12/Mar/18 18:46
            Start Date: 12/Mar/18 18:46
    Worklog Time Spent: 10m 
      Work Description: huygaa11 commented on a change in pull request #4793: 
[BEAM-3776] Fix issue with merging late windows where a watermark hold could be 
added behind the input watermark.
URL: https://github.com/apache/beam/pull/4793#discussion_r173895435

 File path: 
 @@ -873,6 +907,288 @@ public void testWatermarkHoldAndLateData() throws 
Exception {
+  @Test
+  public void testMergingWatermarkHoldAndLateDataSpecific() throws Exception {
 Review comment:
   This test should be simpler and shorter.

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Issue Time Tracking

    Worklog Id:     (was: 79571)
    Time Spent: 1h 20m  (was: 1h 10m)

> StateMerging.mergeWatermarks sets a late watermark hold for late merging 
> windows that depend only on the window
> ---------------------------------------------------------------------------------------------------------------
>                 Key: BEAM-3776
>                 URL: https://issues.apache.org/jira/browse/BEAM-3776
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-core
>    Affects Versions: 2.1.0, 2.2.0, 2.3.0
>            Reporter: Sam Whittle
>            Assignee: Sam Whittle
>            Priority: Critical
>          Time Spent: 1h 20m
>  Remaining Estimate: 0h
> WatermarkHold.addElementHold and WatermarkHold.addGarbageCollectionHold take 
> to not add holds that would be before the input watermark.
> However WatermarkHold.onMerge calls StateMerging.mergeWatermarks which if the 
> window depends only on window, sets a hold for the end of the window 
> regardless of the input watermark.
> Thus if you have a WindowingStrategy such as:
> WindowingStrategy.of(Sessions.withGapDuration(gapDuration))
>  .withMode(AccumulationMode.DISCARDING_FIRED_PANES)
>  .withTrigger(
>  Repeatedly.forever(
>  AfterWatermark.pastEndOfWindow()
>  .withLateFirings(AfterPane.elementCountAtLeast(10))))
>  .withAllowedLateness(allowedLateness))
> and you merge windows that are late, you might end up holding the watermark 
> until the allowedLateness has passed.

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