[
https://issues.apache.org/jira/browse/BEAM-3863?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Maximilian Michels reassigned BEAM-3863:
----------------------------------------
Assignee: Maximilian Michels (was: Aljoscha Krettek)
> AfterProcessingTime trigger doesn't fire reliably
> -------------------------------------------------
>
> Key: BEAM-3863
> URL: https://issues.apache.org/jira/browse/BEAM-3863
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 2.1.0, 2.2.0, 2.3.0
> Reporter: Pawel Bartoszek
> Assignee: Maximilian Michels
> Priority: Major
> Labels: triaged
> Time Spent: 2h
> Remaining Estimate: 0h
>
> *Issue*
> Beam AfterProcessingTime trigger doesn't fire always reliably after a
> configured delay.
> The following job triggers should fire after watermark passes the end of the
> window and then every 5 seconds for late data and the finally at the end of
> allowed lateness.
> *Expected behaviour*
> Late firing after processing time trigger should fire after 5 seconds since
> first late records arrive in the pane.
> *Actual behaviour*
> From my testings late triggers works for some keys but not for the other -
> it's pretty random which keys are affected. The DummySource generates 15
> distinct keys AA,BB,..., PP. For each key it sends 5 on time records and one
> late record. In case late trigger firing is missed it won't fire until the
> allowed lateness period.
> *Job code*
> {code:java}
> String[] runnerArgs = {"--runner=FlinkRunner", "--parallelism=8"};
> FlinkPipelineOptions options =
> PipelineOptionsFactory.fromArgs(runnerArgs).as(FlinkPipelineOptions.class);
> Pipeline pipeline = Pipeline.create(options);
> PCollection<String> apply = pipeline.apply(Read.from(new DummySource()))
>
> .apply(Window.<String>into(FixedWindows.of(Duration.standardSeconds(10)))
> .triggering(AfterWatermark.pastEndOfWindow()
> .withLateFirings(
> AfterProcessingTime
>
> .pastFirstElementInPane().plusDelayOf(Duration.standardSeconds(5))))
> .accumulatingFiredPanes()
> .withAllowedLateness(Duration.standardMinutes(2),
> Window.ClosingBehavior.FIRE_IF_NON_EMPTY)
> );
> apply.apply(Count.perElement())
> .apply(ParDo.of(new DoFn<KV<String, Long>, Long>() {
> @ProcessElement
> public void process(ProcessContext context, BoundedWindow window)
> {
> LOG.info("Count: {}. For window {}, Pane {}",
> context.element(), window, context.pane());
> }
> }));
> pipeline.run().waitUntilFinish();{code}
>
> *How can you replicate the issue?*
> I've created a github repo
> [https://github.com/pbartoszek/BEAM-3863_late_trigger] with the code shown
> above. Please check out the README file for details how to replicate the
> issue.
> *What's is causing the issue?*
> I explained the cause in PR.
>
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