LIU Xiao created FLINK-11987:
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Summary: Kafka producer occasionally throws NullpointerException
Key: FLINK-11987
URL:
https://issues.apache.org/jira/browse/FLINK-11987 Project: Flink
Issue Type: Bug
Components: Connectors / Kafka
Affects Versions: 1.7.2, 1.6.4, 1.6.3
Environment: Flink 1.6.2 (Standalone Cluster)
Oracle JDK 1.8u151
Centos 7.4
Reporter: LIU Xiao
We are using Flink 1.6.2 in our production environment, and kafka producer occasionally throws NullpointerException.
We found in line 175 of flink/flink-connectors/flink-connector-kafka-0.11/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaProducer011.java, NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR was created as a static variable.
Then in line 837, "context.getOperatorStateStore().getUnionListState(NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR);" was called, and that leads to line 734 of
flink/flink-runtime/src/main/java/org/apache/flink/runtime/state/DefaultOperatorStateBackend.java: "stateDescriptor.initializeSerializerUnlessSet(getExecutionConfig());"
In function initializeSerializerUnlessSet(line 283 of flink/flink-core/src/main/java/org/apache/flink/api/common/state/StateDescriptor.java):
if (serializer == null) {
checkState(typeInfo != null, "no serializer and no type info");
// instantiate the serializer
serializer = typeInfo.createSerializer(executionConfig);
// we can drop the type info now, no longer needed
typeInfo = null;
}
"serializer = typeInfo.createSerializer(executionConfig);" is the line which throws the exception.
We think that's because multiple subtasks of the same producer in a same TaskManager share a same NEXT_TRANSACTIONAL_ID_HINT_DESCRIPTOR.
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