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ASF GitHub Bot commented on KAFKA-7066: --------------------------------------- simplesteph opened a new pull request #5239: KAFKA-7066 added better logging in case of Serialisation issue URL: https://github.com/apache/kafka/pull/5239 Following the error message of: https://github.com/apache/kafka/blob/trunk/streams/src/main/java/org/apache/kafka/streams/processor/internals/SinkNode.java#L93 ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > 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 -- This message was sent by Atlassian JIRA (v7.6.3#76005)