[FLINK-7547][build] AsyncFunction.scala extends Function, serialized

[yew1eb]

fix #issue FLINK-7547
details:
org.apache.flink.streaming.api.scala.async.AsyncFunction is not declared Serializable, whereas org.apache.flink.streaming.api.functions.async.AsyncFunction is. This leads to the job not starting as the as async function can't be serialized during initialization.

What is the purpose of the change

(For example: This pull request makes task deployment go through the blob server, rather than through RPC. That way we avoid re-transferring them on each deployment (during recovery).)

Brief change log

(for example:)

• The TaskInfo is stored in the blob store on job creation time as a persistent artifact
• Deployments RPC transmits only the blob storage reference
• TaskManagers retrieve the TaskInfo from the blob cache

Verifying this change

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (100MB)
• Extended integration test for recovery after master (JobManager) failure
• Added test that validates that TaskInfo is transferred only once across recoveries
• Manually verified the change by running a 4 node cluser with 2 JobManagers and 4 TaskManagers, a stateful streaming program, and killing one JobManager and two TaskManagers during the execution, verifying that recovery happens correctly.

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, Yarn/Mesos, ZooKeeper: (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)

[eliaslevy]

👍

[yew1eb]

Hi @twalthr @zentol,
Please helps to review, Thank you very much. 🍻

[yew1eb]

CC @aljoscha 😆

[yew1eb]

CC @zentol

[yew1eb]

@zentol Let me know what you think about this PR now :)

[yew1eb]

can someone review this please? :)

[aljoscha]

Thanks a lot @yew1eb for fixing this! I merged. 😃

Could you please close this PR if it doesn't close automatically?

[yew1eb]

👌