Terxor created FLINK-27041:
------------------------------
Summary: 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
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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