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https://issues.apache.org/jira/browse/FLINK-6343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15978449#comment-15978449
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Aljoscha Krettek commented on FLINK-6343:
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Big +1 for this.
> Migrate from discouraged Java serialization for all sources / sinks
> -------------------------------------------------------------------
>
> Key: FLINK-6343
> URL: https://issues.apache.org/jira/browse/FLINK-6343
> Project: Flink
> Issue Type: Improvement
> Components: Streaming Connectors
> Reporter: Tzu-Li (Gordon) Tai
>
> With FLINK-6324, the Java serialization shortcut for operator state is now
> deprecated to discourage its usage.
> These sources / sinks are still using this shortcut, and should be migrated
> to use {{getListState(descriptor)}} instead:
> - {{BucketingSink}}
> - {{ContinuousFileReaderOperator}}
> - {{GenericWriteAheadSink}}
> - {{MessageAcknowledgingSourceBase}}
> - {{RollingSink}}
> - {{FlinkKafkaConsumerBase}} (will be fixed along with the state migration
> included with FLINK-4022)
> To ease review, I propose to open up subtasks under this JIRA and separate
> PRs for the migration of each single source / sink.
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