Stephane Maarek created KAFKA-7066:
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Summary: 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
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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