Han Yin created FLINK-37335:
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Summary: ForSt fails to generate the first checkpoint in
IncrementalCP and NO_CLAIM mode.
Key: FLINK-37335
URL: https://issues.apache.org/jira/browse/FLINK-37335
Project: Flink
Issue Type: Bug
Components: Runtime / Checkpointing, Runtime / State Backends
Reporter: Han Yin
The {{ForStIncrementalSnapshotStrategy}} throws an exception if it encounters a
{{sharingFilesStrategy}} of {{FORWARD}} when generating asynchronous snapshots.
This behavior is designed to fail early in unexpected situations where full
checkpoints are required for the incremental snapshot strategy.
However, this incorrectly handles the following scenario: When incremental
checkpoints are enabled and the job is restored in {{NO_CLAIM}} mode, the first
checkpoint should be a full checkpoint, meaning the {{sharingFilesStrategy}}
would be {{{}FORWARD{}}}.
To address this issue, we let {{ForStIncrementalSnapshotStrategy}} skip
throwing an exception if it encounters {{FORWARD}} but there are no previous
snapshots to reuse.
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