Maximilian Michels created BEAM-7148:
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Summary: LTS backport: AfterProcessingTime trigger doesn't fire
reliably
Key: BEAM-7148
URL: https://issues.apache.org/jira/browse/BEAM-7148
Project: Beam
Issue Type: Bug
Components: runner-flink
Affects Versions: 2.1.0, 2.2.0, 2.3.0
Reporter: Maximilian Michels
Assignee: Maximilian Michels
Fix For: 2.13.0
*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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