[jira] [Commented] (FLINK-27762) Kafka WakeupException during handling splits changes

["Mason Chen (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-27762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17545668#comment-17545668 ] 

Mason Chen commented on FLINK-27762:
------------------------------------

Hi [~renqs], I also recently encountered a similar issue internally

> It could only happen if the wakeup operation is triggered after KafkaConsumer#poll returns and the flow is still in KafkaPartitionSplitReader#fetch. 

I don't think so, because the exception is thrown from handling the split changes.

 

> 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
>            Assignee: Qingsheng Ren
>            Priority: Major
>              Labels: pull-request-available
>
>  
> 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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