Fokko Driesprong created FLINK-11911:
----------------------------------------
Summary: KafkaTopicPartition is not a valid POJO
Key: FLINK-11911
URL: https://issues.apache.org/jira/browse/FLINK-11911
Project: Flink
Issue Type: Bug
Components: Connectors / Kafka
Affects Versions: 1.7.2
Reporter: Fokko Driesprong
Assignee: Fokko Driesprong
Fix For: 1.8.0
KafkaTopicPartition is not a POJO, and therefore it cannot be serialized
efficiently. This is using the KafkaDeserializationSchema.
When enforcing POJO's:
```
java.lang.UnsupportedOperationException: Generic types have been disabled in
the ExecutionConfig and type
org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition is
treated as a generic type.
at
org.apache.flink.api.java.typeutils.GenericTypeInfo.createSerializer(GenericTypeInfo.java:86)
at
org.apache.flink.api.java.typeutils.TupleTypeInfo.createSerializer(TupleTypeInfo.java:107)
at
org.apache.flink.api.java.typeutils.TupleTypeInfo.createSerializer(TupleTypeInfo.java:52)
at
org.apache.flink.api.java.typeutils.ListTypeInfo.createSerializer(ListTypeInfo.java:102)
at
org.apache.flink.api.common.state.StateDescriptor.initializeSerializerUnlessSet(StateDescriptor.java:288)
at
org.apache.flink.runtime.state.DefaultOperatorStateBackend.getListState(DefaultOperatorStateBackend.java:289)
at
org.apache.flink.runtime.state.DefaultOperatorStateBackend.getUnionListState(DefaultOperatorStateBackend.java:219)
at
org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.initializeState(FlinkKafkaConsumerBase.java:856)
at
org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
at
org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
at
org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
at
org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:278)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738)
at
org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
at java.lang.Thread.run(Thread.java:748)
```
And in the logs:
```
2019-03-13 16:41:28,217 INFO org.apache.flink.api.java.typeutils.TypeExtractor
- class
org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition does
not contain a setter for field topic
2019-03-13 16:41:28,221 INFO org.apache.flink.api.java.typeutils.TypeExtractor
- Class class
org.apache.flink.streaming.connectors.kafka.internals.KafkaTopicPartition
cannot be used as a POJO type because not all fields are valid POJO fields, and
must be processed as GenericType. Please read the Flink documentation on "Data
Types & Serialization" for details of the effect on performance.
```
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