[jira] [Commented] (FLINK-27041) KafkaSource in batch mode failing on 0 messages in any topic partition

["Martijn Visser (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-27041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17516766#comment-17516766 ] 

Martijn Visser commented on FLINK-27041:
----------------------------------------

[~renqs] Can you have a look?

> KafkaSource in batch mode failing on 0 messages in any topic partition
> ----------------------------------------------------------------------
>
>                 Key: FLINK-27041
>                 URL: https://issues.apache.org/jira/browse/FLINK-27041
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka
>    Affects Versions: 1.14.4
>         Environment: Kafka cluster version: 3.1.0
> Flink version 1.14.4
>            Reporter: Terxor
>            Priority: Blocker
>
> First let's take the case of consuming from a Kafka topic with a single partition having 0 messages. Execution in batch mode, with bounded offsets set to latest, is expected to finish gracefully. However, it fails with an exception.
> Consider this minimal working example (assume that test_topic exists with 1 partition and 0 messages):
> {code:java}
> 		final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
> 		env.setRuntimeMode(RuntimeExecutionMode.BATCH);
> 		KafkaSource<String> kafkaSource = KafkaSource
> 				.<String>builder()
> 				.setBootstrapServers("localhost:9092")
> 				.setTopics("test_topic")
> 				.setValueOnlyDeserializer(new SimpleStringSchema())
> 				.setBounded(OffsetsInitializer.latest())
> 				.build();
> 		DataStream<String> stream = env.fromSource(
> 				kafkaSource,
> 				WatermarkStrategy.noWatermarks(),
> 				"Kafka Source"
> 		);
> 		stream.print();
> 		env.execute("Flink KafkaSource test job");
> {code}
> This produces exception:
> {code}
> Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: Job execution failed.
> 	at org.apache.flink.runtime.jobmaster.JobResult.toJobExecutionResult(JobResult.java:144)
>   ... [omitted for readability]
> Caused by: org.apache.flink.runtime.JobException: Recovery is suppressed by NoRestartBackoffTimeStrategy
> 	at org.apache.flink.runtime.executiongraph.failover.flip1.ExecutionFailureHandler.handleFailure(ExecutionFailureHandler.java:138)
>   ... [omitted for readability]
> Caused by: java.lang.RuntimeException: One or more fetchers have encountered exception
> 	at org.apache.flink.connector.base.source.reader.fetcher.SplitFetcherManager.checkErrors(SplitFetcherManager.java:225)
> 	at org.apache.flink.connector.base.source.reader.SourceReaderBase.getNextFetch(SourceReaderBase.java:169)
> 	at org.apache.flink.connector.base.source.reader.SourceReaderBase.pollNext(SourceReaderBase.java:130)
> 	at org.apache.flink.streaming.api.operators.SourceOperator.emitNext(SourceOperator.java:351)
> 	at org.apache.flink.streaming.runtime.io.StreamTaskSourceInput.emitNext(StreamTaskSourceInput.java:68)
> 	at org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:65)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:496)
> 	at org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:203)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:809)
> 	at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:761)
> 	at org.apache.flink.runtime.taskmanager.Task.runWithSystemExitMonitoring(Task.java:958)
> 	at org.apache.flink.runtime.taskmanager.Task.restoreAndInvoke(Task.java:937)
> 	at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:766)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:575)
> 	at java.base/java.lang.Thread.run(Thread.java:829)
> Caused by: java.lang.RuntimeException: SplitFetcher thread 0 received unexpected exception while polling the records
> 	at org.apache.flink.connector.base.source.reader.fetcher.SplitFetcher.runOnce(SplitFetcher.java:150)
> 	at org.apache.flink.connector.base.source.reader.fetcher.SplitFetcher.run(SplitFetcher.java:105)
> 	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
> 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
> 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> 	... 1 more
> Caused by: java.lang.IllegalStateException: Consumer is not subscribed to any topics or assigned any partitions
> 	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1223)
> 	at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1211)
> 	at org.apache.flink.connector.kafka.source.reader.KafkaPartitionSplitReader.fetch(KafkaPartitionSplitReader.java:97)
> 	at org.apache.flink.connector.base.source.reader.fetcher.FetchTask.run(FetchTask.java:58)
> 	at org.apache.flink.connector.base.source.reader.fetcher.SplitFetcher.runOnce(SplitFetcher.java:142)
> 	... 6 more
> {code}
> In our actual use case, we have a Kafka topic with many partitions. Some of them have no messages. This causes our batch job to fail.



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