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

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

     [ https://issues.apache.org/jira/browse/FLINK-15904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek closed FLINK-15904.
------------------------------------
    Fix Version/s: 1.11.0
       Resolution: Fixed

master: 7a9580e021ce157c8a1adfbcd79077b4647789d6

> 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
>             Fix For: 1.11.0
>
>          Time Spent: 20m
>  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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