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https://issues.apache.org/jira/browse/BEAM-3776?focusedWorklogId=79570&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-79570
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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_r173894355
##########
File path:
runners/core-java/src/main/java/org/apache/beam/runners/core/WatermarkHold.java
##########
@@ -247,8 +249,26 @@ private Instant addGarbageCollectionHold(
/**
* Prefetch watermark holds in preparation for merging.
*/
- public void prefetchOnMerge(MergingStateAccessor<?, W> state) {
- StateMerging.prefetchWatermarks(state, elementHoldTag);
+ public void prefetchOnMerge(MergingStateAccessor<?, W> context) {
Review comment:
Is there any specific reason why code is moved out from StateMerging.java?
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Issue Time Tracking
-------------------
Worklog Id: (was: 79570)
Time Spent: 1h 10m (was: 1h)
> 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 10m
> 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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