[jira] [Reopened] (FLINK-19283) Allow subclasses to override/extend FlinkKafkaConsumerBase checkpoint methods

["Konstantin Knauf (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-19283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Konstantin Knauf reopened FLINK-19283:
--------------------------------------

Re-opening in accordance with https://issues.apache.org/jira/browse/FLINK-23206.

> Allow subclasses to override/extend FlinkKafkaConsumerBase checkpoint methods
> -----------------------------------------------------------------------------
>
>                 Key: FLINK-19283
>                 URL: https://issues.apache.org/jira/browse/FLINK-19283
>             Project: Flink
>          Issue Type: Improvement
>          Components: Connectors / Kafka
>    Affects Versions: 1.11.0, 1.11.1
>            Reporter: Adrian Kreuziger
>            Priority: Minor
>              Labels: auto-closed
>
> I'm working on a class that extends the FlinkKafkaConsumer to add some additional functionality the first time the consumer runs. I'd like to be able to store some additional state, but am unable to do so as the initializeState() and snapshotState() are marked as final. Ideally I'd like to be able to do something like
> {code:java}
> @Override	
> public void initializeState(FunctionInitializationContext context) throws Exception {
>     super.initializeState(context);
>     // some additional initialization here
> }
> @Override	
> public void snapshotState(FunctionSnapshotContext context) throws Exception {
>     super.snapshotState(context);
>     // set some additional state here
> }{code}
> I'm guessing it was marked final for a reason, is there a reason this would be problematic? The restoredState and unionOffsetStates properties are still private which would prevent subclasses from modifying the offset state.
>  



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