[
https://issues.apache.org/jira/browse/BEAM-11034?focusedWorklogId=496485&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-496485
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ASF GitHub Bot logged work on BEAM-11034:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 07/Oct/20 10:52
Start Date: 07/Oct/20 10:52
Worklog Time Spent: 10m
Work Description: scwhittle opened a new pull request #13032:
URL: https://github.com/apache/beam/pull/13032
… GlobalWindow.
Such cleanup timers are not needed on the GlobalWindow for DoFn without
@onWindowExpiration. It is a common pattern for users to use the global
window for stateful processing for full control using state and timers.
However if this is done for stages with unbounded keyspaces, the gc
timers build up indefinitely.
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Issue Time Tracking
-------------------
Worklog Id: (was: 496485)
Remaining Estimate: 0h
Time Spent: 10m
> State garbage collection timers set by Dataflow SimpleParDoFn pile up for the
> GlobalWindow
> ------------------------------------------------------------------------------------------
>
> Key: BEAM-11034
> URL: https://issues.apache.org/jira/browse/BEAM-11034
> Project: Beam
> Issue Type: Bug
> Components: runner-dataflow
> Reporter: Sam Whittle
> Assignee: Sam Whittle
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> If the dofn is stateful, garbage collection timers are set for the end of the
> window plus allowed lateness:
> https://github.com/apache/beam/blob/6fdde4f4eab72b49b10a8bb1cb3be263c5c416b5/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/SimpleParDoFn.java#L491
> For the global window this ends up setting garbage collection timers that
> will only fire once the pipeline is drained. For pipelines that have
> constantly newly arriving unique stateful keys, and otherwise cleanup their
> state appropriately when triggering occurs, the # of timers builds up over
> time.
> Example window and trigger, where the user has the opportunity to clean up
> state for the key after at most a minute. However they have no control over
> the timer set.
> GlobalWindows()
> .triggering(Repeatedly.forever(AfterFirst.of(
> AfterPane.elementCountAtLeast(5000),
> AfterProcessingTime.pastFirstElementInPane().plusDelayOf(Duration.standardMi
> nutes(1))).discardingFiredPanes().withAllowedLateness(Duration.ZERO);
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