[FLINK-21088][runtime][checkpoint] Pass the flag about whether a task is finished on restore on recovery

[gaoyunhaii]

What is the purpose of the change

For checkpoints after tasks finished, if some operators are fully finished, it would store a special state content in the checkpoint metadata. After recovery, the flag of whether the operator is fully finished should be passed to the task side so that these operator could skip execution (which would be implemented in the next PR).

Brief change log

• 2131028 passes the flag to the task.

Verifying this change

This change added tests and can be verified via added ut.

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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Last check on commit 8f28386 (Thu Sep 23 18:02:11 UTC 2021)

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[gaoyunhaii]

Hi @dawidwys , could you have a look at this PR when convenient~? This is the first of the two PR regarding restoring finished state.

[dawidwys]

Thanks for the PR. If possible I'd really like to avoid exposing the isFinishedOnRestore flag in the StreamTaskStateInitializer

[gaoyunhaii]

Hi @dawidwys very thanks for the review! I updated the PR according to the comments~ I directly modified the original commits since there is a part of code get reverted~

[dawidwys]

Thanks for the update! Looks good. I'll wait for Azure and then merge it.

[dawidwys]

@flinkbot run azure