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https://issues.apache.org/jira/browse/FLINK-27762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17541907#comment-17541907
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Martijn Visser commented on FLINK-27762:
----------------------------------------
[~renqs] WDYT?
> 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
> Priority: Major
>
>
> We enable dynamic partition discovery in our flink job, but job 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, according 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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