[FLINK-33057][Checkpointing] Add options to disable creating job-id subdirectories under the checkpoint directory

[Zakelly]

What is the purpose of the change

By default, Flink creates subdirectories named by UUID (job id) under checkpoint directory for each job. It's a good means to avoid collision. However, it also bring in some effort to remember/find the right directory when recovering from previous checkpoint, as well as cleaning the old subdirectories. According to previous discussion (Yun Tang's and Stephan Ewen's ), I think it would be useful to add an option to disable creating the UUID subdirectories under the checkpoint directory. For compatibility considerations, we create the subdirectories by default.

Brief change log

• Provide a new configuration named 'state.checkpoints.create-subdir' to control the behavior of creating job-id subdirectories under the checkpoint directory or not. This is an advanced option, which is well documented and warned.

Verifying this change

This change is already covered by newly added tests, a parameterized AbstractFileCheckpointStorageAccessTestBase#testCreateCheckpointSubDirs .

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)

[flinkbot]

CI report:

• c26b8b7 Azure: FAILURE

Bot commands

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• @flinkbot run azure re-run the last Azure build

[Zakelly]

@masteryhx @Myasuka What do you think about adding this option?

[masteryhx]

Thanks for the PR, PTAL my comments.
Could you also add an IT to test switching this option which is important for users to use it out of the box ?

[Myasuka]

Thanks for creating this PR, please take a look at my comments.

[Zakelly]

@masteryhx @Myasuka Thanks for your review! I have addressed your comments, would you please take another look? Thanks!

[masteryhx]

Thanks for the update.
Current PR LGTM % the conflict.
Could you rebase all commits into master to resolve the conflict ?
BTW, please remember to rename the title with component tag.

[Zakelly]

Thanks for the update. Current PR LGTM % the conflict. Could you rebase all commits into master to resolve the conflict ? BTW, please remember to rename the title with component tag.

Already done, thanks @masteryhx

[masteryhx]

LGTM.