gaoyunhaii opened a new pull request #14234:
URL: https://github.com/apache/flink/pull/14234
## What is the purpose of the change
This PR makes `FileSink` supports migrating from `StreamingFileSink`. It is
based on the modification of the underlying new sink implementation.
## Brief change log
- ed7e15cfe9f33208640b9ec98b87872f63004fd6 adds the support and add the
basic test.
- 092ef0b8ff64fe7761843e04c908c0563ad92bf1 refactors the
`BucketStateSerializerTest` so that we could reuse the code in the new
migration tests.
- 3189f3d03e8b46eb2e15592eb80eae19dbf71b70 refactors the `FileSinkITCase` so
that we could reuse the components and check logic
- 323e1feb319a5138fd4465d671c98156c1d71cc2 add the migration tests.
## Verifying this change
- Adds unit test for migrating from `BucketState` to new
`FileWriterBucketState`.
- Adds IT case that migrating from StreamingFileSink to FileSink via
savepoint.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): **no**
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: **no**
- The serializers: **no**
- The runtime per-record code paths (performance sensitive): **no**
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: **no**
- The S3 file system connector: **no**
## Documentation
- Does this pull request introduce a new feature? **no**
- If yes, how is the feature documented? **not applicable**
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