dawidwys opened a new pull request #18086:
URL: https://github.com/apache/flink/pull/18086
## What is the purpose of the change
We introduce NO_CLAIM restore mode in which we do not take ownership of
the restored checkpoint. We do enforce the first, successful checkpoint
after a restore to be "full" meaning it can not share any artefacts with
the initial one.
Taking a "full" snapshot needs support from state backend, therefore we
add a method supportsFullSnapshots to the Snapshottable interface, so
that state backend can add support incrementally. If a state backend
does not support forces snapshots, user can switch to either the LEGACY
mode or CLAIM mode.
## Verifying this change
Added:
* IT test: `SavepointITCase.testTriggerSavepointAndResumeWithNoClaim`
* `StreamTaskTest.testForceFullSnapshotOnIncompatibleStateBackend`
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (**yes** / no)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (**yes** / no / don't
know)
- The S3 file system connector: (yes / **no /** don't know)
## Documentation
- Does this pull request introduce a new feature? (**yes** / no)
- If yes, how is the feature documented? (not applicable / docs /
**JavaDocs** / not documented): will be documented in a separate effort
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