yelianevich commented on issue #31085:
URL: https://github.com/apache/beam/issues/31085#issuecomment-2126656952
> I don't know if there are any workarounds, as the described behavior seems
to be (unknown) bug. It needs further investigation. Could you please provide a
simplified pipeline that is affected by this?
I could easily reproduce it locally with a test container of Confluent Kafka
7.6.0 and Flink 1.15.4.
I run this test with Beam 2.51.0 (the last version that work) and 2.56.0
(always fails).
Here is the test case, see the comments in the code.
```java
@Test
void testBeamFromKafkaSourcesIssue() throws Exception {
// this topic receives data
String topicFull = "topic-in-1";
// this topic is empty - the main ingredient to reproduce the issue
// if I remove it from the input - it works on 2.56.0
String topicEmpty = "topic-in-2";
try (AdminClient adminClient =
KafkaAdminClient.create(kafkaProperties.buildAdminProperties())) {
adminClient
.createTopics(List.of(
new NewTopic(topicFull, 3, (short) 1),
new NewTopic(topicEmpty, 3, (short) 1)
))
.all()
.get(5, TimeUnit.SECONDS);
}
try (KafkaProducer<String, String> producer = new
KafkaProducer<>(kafkaProperties.buildProducerProperties())) {
producer.send(new ProducerRecord<>(topicFull, 0, null,
"payload-0")).get();
producer.send(new ProducerRecord<>(topicFull, 1, null,
"payload-11")).get();
producer.send(new ProducerRecord<>(topicFull, 2, null,
"payload-222")).get();
producer.send(new ProducerRecord<>(topicFull, 0, null,
"payload-0")).get();
}
PipelineOptions opts = PipelineOptionsFactory.create();
opts.setRunner(TestFlinkRunner.class);
Pipeline pipeline = Pipeline.create(opts);
String bootstrapServers = String.join(",",
kafkaProperties.getBootstrapServers());
PCollection<KafkaRecord<String, String>> readFullTopic = pipeline
.apply("ReadTopic1", createReader(topicFull,
bootstrapServers));
PCollection<KafkaRecord<String, String>> readEmptyTopic = pipeline
.apply("ReadTopic2", createReader(topicEmpty,
bootstrapServers));
PCollectionList.of(List.of(readFullTopic, readEmptyTopic))
.apply("Flatten", Flatten.pCollections())
.apply("ToString", MapElements.into(strings()).via(r ->
r.getKV().getValue()))
.apply("LogInput", ParDo.of(LogContext.of("Input")))
.apply("Window",
Window.into(FixedWindows.of(Duration.standardSeconds(3))))
.apply("Count", Count.perElement())
.apply("LogOutput", ParDo.of(LogContext.of("Counts")));
pipeline.run();
}
private static KafkaIO.Read<String, String> createReader(String
kafkaTopic, String bootstrapServers) {
return KafkaIO.<String, String>read()
.withBootstrapServers(bootstrapServers)
.withTopic(kafkaTopic)
.withKeyDeserializer(StringDeserializer.class)
.withValueDeserializer(StringDeserializer.class)
.withConsumerConfigUpdates(Map.of(
AUTO_OFFSET_RESET_CONFIG, "earliest"
));
}
@AllArgsConstructor(staticName = "of")
static class LogContext<T> extends DoFn<T, T> {
private final String prefix;
@ProcessElement
public void processElement(ProcessContext c) {
System.out.printf("%s: Element: %s, pane: %s, ts: %s%n", prefix,
c.element(), c.pane(), c.timestamp());
c.output(c.element());
}
}
```
Output from `LogContext`
2.56.0 (never fires a window, never outputs counts)
```
Input: Element: payload-0, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:31:08.674Z
Input: Element: payload-11, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:31:08.695Z
Input: Element: payload-222, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:31:08.696Z
Input: Element: payload-0, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:31:08.696Z
```
2.51.0 (expected)
```
Input: Element: payload-0, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:26:43.119Z
Input: Element: payload-11, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:26:43.140Z
Input: Element: payload-222, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:26:43.141Z
Input: Element: payload-0, pane: PaneInfo.NO_FIRING, ts:
2024-05-23T09:26:43.141Z
Counts: Element: KV{payload-0, 2}, pane: PaneInfo{isFirst=true, isLast=true,
timing=ON_TIME, index=0, onTimeIndex=0}, ts: 2024-05-23T09:26:44.999Z
Counts: Element: KV{payload-222, 1}, pane: PaneInfo{isFirst=true,
isLast=true, timing=ON_TIME, index=0, onTimeIndex=0}, ts:
2024-05-23T09:26:44.999Z
Counts: Element: KV{payload-11, 1}, pane: PaneInfo{isFirst=true,
isLast=true, timing=ON_TIME, index=0, onTimeIndex=0}, ts:
2024-05-23T09:26:44.999Z
```
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