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https://issues.apache.org/jira/browse/FLINK-24987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Morávek updated FLINK-24987:
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Affects Version/s: (was: 1.14.0)
> Enhance ExternalizedCheckpointCleanup enum
> ------------------------------------------
>
> Key: FLINK-24987
> URL: https://issues.apache.org/jira/browse/FLINK-24987
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Reporter: Nicolaus Weidner
> Assignee: Nicolaus Weidner
> Priority: Major
> Fix For: 1.15.0
>
>
> We use the config setting
> [execution.checkpointing.externalized-checkpoint-retention|https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/environment/ExecutionCheckpointingOptions.java#L90-L119]
> to distinguish three cases:
> - delete on cancellation
> - retain on cancellation
> - no externalized checkpoints (if no value is set)
> It would be easier to understand if we had an explicit enum value
> NO_EXTERNALIZED_CHECKPOINTS for the third case in
> [ExternalizedCheckpointCleanup|https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/environment/CheckpointConfig.java#L702-L742].
> This would also avoid potential issues for clients with handling null values
> (for example, null values being dropped on serialization could be annoying
> when trying to change from RETAIN_ON_CANCELLATION to no external checkpoints).
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