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https://issues.apache.org/jira/browse/FLINK-25132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454980#comment-17454980
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Qingsheng Ren commented on FLINK-25132:
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[~mason6345] I think so. We'll make a back-port on 1.13 after fix this on master
> KafkaSource cannot work with object-reusing DeserializationSchema
> -----------------------------------------------------------------
>
> Key: FLINK-25132
> URL: https://issues.apache.org/jira/browse/FLINK-25132
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.14.0, 1.15.0, 1.14.1
> Reporter: Qingsheng Ren
> Assignee: Qingsheng Ren
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.15.0, 1.14.1
>
>
> Currently Kafka source deserializes ConsumerRecords in split reader and puts
> them into the elementQueue, then task's main thread polls these records from
> the queue asynchronously. This mechanism cannot cooperate with
> DeserializationSchemas with object reuse: all records staying in the element
> queue points to the same object.
> A solution would be moving deserialization to RecordEmitter, which works in
> the task's main thread.
> Notes that this issue actually effects all sources which do deserialization
> in split reader.
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