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https://issues.apache.org/jira/browse/BEAM-9557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17065112#comment-17065112
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Reuven Lax commented on BEAM-9557:
----------------------------------
This looks like it might be a type bug? I think that
checkArgument(!target.isAfter(windowExpiry))
should actually have been
checkArgument(!outputTimestamp.isAfter(windowExpiry),
> Error setting processing time timers near end-of-window
> -------------------------------------------------------
>
> Key: BEAM-9557
> URL: https://issues.apache.org/jira/browse/BEAM-9557
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Steve Niemitz
> Assignee: Reuven Lax
> Priority: Critical
> Fix For: 2.20.0
>
>
> Previously, it was possible to set a processing time timer past the end of a
> window, and it would simply not fire.
> However, now, this results in an error:
> {code:java}
> java.lang.IllegalArgumentException: Attempted to set event time timer that
> outputs for 2020-03-19T18:01:35.000Z but that is after the expiration of
> window 2020-03-19T17:59:59.999Z
>
> org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkArgument(Preconditions.java:440)
>
> org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner$TimerInternalsTimer.setAndVerifyOutputTimestamp(SimpleDoFnRunner.java:1011)
>
> org.apache.beam.runners.dataflow.worker.repackaged.org.apache.beam.runners.core.SimpleDoFnRunner$TimerInternalsTimer.setRelative(SimpleDoFnRunner.java:934)
> <snip>.processElement(???.scala:187)
> {code}
>
> I think the regression was introduced in commit
> a005fd765a762183ca88df90f261f6d4a20cf3e0. Also notice that the error message
> is wrong, it says that "event time timer" but the timer is in the processing
> time domain.
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