Zakelly opened a new pull request, #22590:
URL: https://github.com/apache/flink/pull/22590
## What is the purpose of the change
As the first part of FLIP-306, which aims to provide an unified file merging
mechanism for checkpoint files, this ticket/PR implements the basic file
manager for merged files, providing file system directory layout and its
initialization. It also provides the implementation of physical and logical
files and the reference counting relationship between them.
## Brief change log
- Add definition of FileMergingSnapshotManager and a base implementation.
- Add definition of PhysicalFile and LogicalFile.
## Verifying this change
This change added an UT class called FileMergingSnapshotManagerTest.
## 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)
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