zoucan created FLINK-27762:
------------------------------
Summary: Kafka WakeUpException during handling splits changes
Key: FLINK-27762
URL: https://issues.apache.org/jira/browse/FLINK-27762
Project: Flink
Issue Type: Bug
Components: Connectors / Kafka
Affects Versions: 1.14.3
Reporter: zoucan
We enable dynamic partition discovery in our flink job, but job is failed when
kafka partition is changed.
Exception detail is shown as follows:
{code:java}
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:350)
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.lang.Thread.run(Thread.java:748)
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.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
... 1 more
Caused by: org.apache.kafka.common.errors.WakeupException
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.maybeTriggerWakeup(ConsumerNetworkClient.java:511)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:275)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:233)
at
org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:224)
at
org.apache.kafka.clients.consumer.KafkaConsumer.position(KafkaConsumer.java:1726)
at
org.apache.kafka.clients.consumer.KafkaConsumer.position(KafkaConsumer.java:1684)
at
org.apache.flink.connector.kafka.source.reader.KafkaPartitionSplitReader.removeEmptySplits(KafkaPartitionSplitReader.java:315)
at
org.apache.flink.connector.kafka.source.reader.KafkaPartitionSplitReader.handleSplitsChanges(KafkaPartitionSplitReader.java:200)
at
org.apache.flink.connector.base.source.reader.fetcher.AddSplitsTask.run(AddSplitsTask.java:51)
at
org.apache.flink.connector.base.source.reader.fetcher.SplitFetcher.runOnce(SplitFetcher.java:142)
... 6 more {code}
After preliminary investigation, acccording to source code of KafkaSource,
At first:
method *org.apache.kafka.clients.consumer.KafkaConsumer.wakeup()* will be
called if consumer is polling data.
Later:
method *org.apache.kafka.clients.consumer.KafkaConsumer.position()* will be
called
during handle splits changes.
Since consumer has been waken up, it will throw WakeUpException.
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