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https://issues.apache.org/jira/browse/FLINK-24987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17458944#comment-17458944
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Ingo Bürk commented on FLINK-24987:
-----------------------------------
Fixed in 1.14
commit 30da65ca7e6d7481cef02eb0ebe9a00a1de94c0c
[streaming-java] Add explicit enum value NO_EXTERNAL_CHECKPOINTS as default for
externalized-checkpoint-retention
commit 39c6949a41f56ef6ce62170aaaceff0e54456504
[docs] Improve ExternalizedCheckpointCleanup documentation
Fixed in 1.13
commit cf9f90eb812ed2dbe46e717b6c2514da53c38a93
[streaming-java] Add explicit enum value NO_EXTERNAL_CHECKPOINTS as default for
externalized-checkpoint-retention
> Enhance ExternalizedCheckpointCleanup enum
> ------------------------------------------
>
> Key: FLINK-24987
> URL: https://issues.apache.org/jira/browse/FLINK-24987
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Configuration
> Reporter: Nicolaus Weidner
> Assignee: Nicolaus Weidner
> Priority: Major
> Labels: pull-request-available
> 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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