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https://issues.apache.org/jira/browse/FLINK-15904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aljoscha Krettek reassigned FLINK-15904:
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Assignee: Oleksandr Nitavskyi
> 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
> Assignee: Oleksandr Nitavskyi
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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