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https://issues.apache.org/jira/browse/KAFKA-7066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Guozhang Wang resolved KAFKA-7066.
----------------------------------
Resolution: Fixed
> Make Streams Runtime Error User Friendly in Case of Serialisation exception
> ---------------------------------------------------------------------------
>
> Key: KAFKA-7066
> URL: https://issues.apache.org/jira/browse/KAFKA-7066
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 1.1.0
> Reporter: Stephane Maarek
> Assignee: Stephane Maarek
> Priority: Major
> Fix For: 2.0.0
>
>
> This kind of exception can be cryptic for the beginner:
> {code:java}
> ERROR stream-thread
> [favourite-colors-application-a336770d-6ba6-4bbb-8681-3c8ea91bd12e-StreamThread-1]
> Failed to process stream task 2_0 due to the following error:
> (org.apache.kafka.streams.processor.internals.AssignedStreamsTasks:105)
> java.lang.ClassCastException: java.lang.Long cannot be cast to
> java.lang.String
> at
> org.apache.kafka.common.serialization.StringSerializer.serialize(StringSerializer.java:28)
> at org.apache.kafka.streams.state.StateSerdes.rawValue(StateSerdes.java:178)
> at
> org.apache.kafka.streams.state.internals.MeteredKeyValueBytesStore$1.innerValue(MeteredKeyValueBytesStore.java:66)
> at
> org.apache.kafka.streams.state.internals.MeteredKeyValueBytesStore$1.innerValue(MeteredKeyValueBytesStore.java:57)
> at
> org.apache.kafka.streams.state.internals.InnerMeteredKeyValueStore.put(InnerMeteredKeyValueStore.java:198)
> at
> org.apache.kafka.streams.state.internals.MeteredKeyValueBytesStore.put(MeteredKeyValueBytesStore.java:117)
> at
> org.apache.kafka.streams.kstream.internals.KTableAggregate$KTableAggregateProcessor.process(KTableAggregate.java:95)
> at
> org.apache.kafka.streams.kstream.internals.KTableAggregate$KTableAggregateProcessor.process(KTableAggregate.java:56)
> at
> org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:46)
> at
> org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:208)
> at
> org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:124)
> at
> org.apache.kafka.streams.processor.internals.AbstractProcessorContext.forward(AbstractProcessorContext.java:174)
> at
> org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:80)
> at
> org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:224)
> at
> org.apache.kafka.streams.processor.internals.AssignedStreamsTasks.process(AssignedStreamsTasks.java:94)
> at
> org.apache.kafka.streams.processor.internals.TaskManager.process(TaskManager.java:411)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.processAndMaybeCommit(StreamThread.java:918)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runOnce(StreamThread.java:798)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:750)
> at
> org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:720){code}
> We should add more detailed logging already present in SinkNode to assist the
> user into solving this issue
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