[KAFKA-5205] CachingSessionStore doesn't use the default keySerde.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.10.2.0
• Fix Version/s: 0.10.2.2, 0.11.0.0
• Component/s: streams
• Assignee: Kyle Winkelman
• Reporter: Kyle Winkelman
• Created: 09/May/17 18:24
• Updated: 15/May/17 18:56
• Resolved: 15/May/17 18:56

Description

CachingSessionStore wasn't properly using the default keySerde if no Serde was supplied. I saw the below error in the logs for one of my test cases.

ERROR stream-thread [cogroup-integration-test-3-5570fe48-d2a3-4271-80b1-81962295553d-StreamThread-6] Streams application error during processing: (org.apache.kafka.streams.processor.internals.StreamThread:335)
java.lang.NullPointerException
at org.apache.kafka.streams.state.internals.CachingSessionStore.findSessions(CachingSessionStore.java:93)
at org.apache.kafka.streams.kstream.internals.KStreamSessionWindowAggregate$KStreamSessionWindowAggregateProcessor.process(KStreamSessionWindowAggregate.java:94)
at org.apache.kafka.streams.processor.internals.ProcessorNode$1.run(ProcessorNode.java:47)
at org.apache.kafka.streams.processor.internals.StreamsMetricsImpl.measureLatencyNs(StreamsMetricsImpl.java:187)
at org.apache.kafka.streams.processor.internals.ProcessorNode.process(ProcessorNode.java:133)
at org.apache.kafka.streams.processor.internals.ProcessorContextImpl.forward(ProcessorContextImpl.java:82)
at org.apache.kafka.streams.processor.internals.SourceNode.process(SourceNode.java:69)
at org.apache.kafka.streams.processor.internals.StreamTask.process(StreamTask.java:206)
at org.apache.kafka.streams.processor.internals.StreamThread.processAndPunctuate(StreamThread.java:657)
at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:728)
at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:327)