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https://issues.apache.org/jira/browse/FLINK-39949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18090055#comment-18090055
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Jubin Soni commented on FLINK-39949:
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So in practical terms: if you have a Flink job running on
{{HashMapStateBackend}} and want to migrate it to {{{}ForSt{}}}, you take a
savepoint and restore into ForSt. Without this PR, that throws
{{{}UnsupportedOperationException{}}}. With it, the restore works.
It does not cover:
* Restoring ForSt's own incremental checkpoints (that's
{{{}ForStIncrementalRestoreOperation{}}}, which already exists)
* ForSt → ForSt restore from its own savepoints (ForSt only produces
{{NATIVE}} format savepoints, not {{{}CANONICAL{}}})
So the use case is cross-backend migration into ForSt.
> [ForSt] State restore from savepoints/checkpoints not supported
> ---------------------------------------------------------------
>
> Key: FLINK-39949
> URL: https://issues.apache.org/jira/browse/FLINK-39949
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / State Backends
> Reporter: Jubin Soni
> Priority: Minor
> Labels: pull-request-available
>
> The ForSt state backend currently does not support restoring from savepoints
> or checkpoints. When a restore is attempted,
> {{ForStKeyedStateBackendBuilder#restoreForStKeyedStateBackend()}}
> unconditionally throws the following exception:
> UnsupportedOperationException: Not support restoring yet for ForStStateBackend
>
> *File location:*
> {{flink-state-backends/flink-statebackend-forst/src/main/java/org/apache/flink/state/forst/ForStKeyedStateBackendBuilder.java}}
> Line: 428
> *Steps to Reproduce:*
> # Configure a Flink job to use the ForSt state backend
> # Take a checkpoint or savepoint
> # Restart the job and attempt to restore from that checkpoint/savepoint
> *Expected Result:*
> The job should resume from the checkpoint with all state intact.
> *Actual Result:*
> The job fails with:
> UnsupportedOperationException: Not support restoring yet for ForStStateBackend
>
>
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