lamber-ken commented on issue #8583: [FLINK-11820][serialization] SimpleStringSchema handle message record which value is null URL: https://github.com/apache/flink/pull/8583#issuecomment-499997592 > Scratch that, I don't think we can do this. Our Kafka consumer silently swallows null values: > > https://github.com/apache/flink/blob/049994274c9d4fc07925a7639e4044506b090d10/flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/internals/AbstractFetcher.java#L407-L410 > . Plus, I think our serializers in general don't always support `null` values. The fact that `StringSerializer` does is more of an anomaly. (also thanks to @GJL for pointing this out to me 😃) from the NPE stackstrace, we can see that the NPE happens before `AbstractFetcher#emitRecord`.
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