[jira] [Created] (FLINK-15904) Make Kafka Consumer work with activated "disableGenericTypes()"

["Aljoscha Krettek (Jira)" <ji...@apache.org>]

Aljoscha Krettek created FLINK-15904:
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             Summary: Make Kafka Consumer work with activated "disableGenericTypes()"
                 Key: FLINK-15904
                 URL: https://issues.apache.org/jira/browse/FLINK-15904
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Kafka
            Reporter: Aljoscha Krettek


A user reported a problem that the Kafka Consumer doesn't work in that case: https://lists.apache.org/thread.html/r462a854e8a0ab3512e2906b40411624f3164ea3af7cba61ee94cd760%40%3Cuser.flink.apache.org%3E. We should use a different constructor for {{ListStateDescriptor}} that takes {{TypeSerializer}} here: https://github.com/apache/flink/blob/68cc21e4af71505efa142110e35a1f8b1c25fe6e/flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java#L860. This will circumvent the check.

My full analysis from the email thread:

{quote}
Unfortunately, the fact that the Kafka Sources use Kryo for state serialization is a very early design misstep that we cannot get rid of for now. We will get rid of that when the new source interface lands ([1]) and when we have a new Kafka Source based on that.

As a workaround, we should change the Kafka Consumer to go through a different constructor of ListStateDescriptor which directly takes a TypeSerializer instead of a TypeInformation here: [2]. This should sidestep the "no generic types" check.

[1] https://cwiki.apache.org/confluence/display/FLINK/FLIP-27%3A+Refactor+Source+Interface
[2] https://github.com/apache/flink/blob/68cc21e4af71505efa142110e35a1f8b1c25fe6e/flink-connectors/flink-connector-kafka-base/src/main/java/org/apache/flink/streaming/connectors/kafka/FlinkKafkaConsumerBase.java#L860
{quote}



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