[FLINK-20454][format][debezium] Allow to read metadata for debezium-avro-confluent format

[limer2]

What is the purpose of the change

The metadata fields below are currently unavailable when using debezium-avro-confluent fomat. Hence, enhance this format to allow read metadata fields by exposing them as read-only (VIRTUAL) table columns

• ingestion-timestamp
• source.timestamp
• source.database
• source.schema
• source.table
• source.properties

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 make sure both new and modified tests in this PR follows the conventions defined in our code quality guide: https://flink.apache.org/contributing/code-style-and-quality-common.html#testing

(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, 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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Automated Checks

Last check on commit adefb85e1ad7c1597bc6b6b27d43ad334879732a (Mon Feb 14 04:44:57 UTC 2022)

Warnings:

• No documentation files were touched! Remember to keep the Flink docs up to date!

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Review Progress

• ❓ 1. The [description] looks good.
• ❓ 2. There is [consensus] that the contribution should go into to Flink.
• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 485695c847fbd14357bbecd5776fa47ed29187e6 Azure: SUCCESS

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[leonardBang]

@limer2 looks like you linked an incorrect issue FLINK-24745

[limer2]

@limer2 looks like you linked an incorrect issue FLINK-24745

@leonardBang sorry for my mistake. I've corrected the PR title now.

[esselius]

What's the status for this PR?

[diarworld]

Could anyone review this PR? It seems to be a very useful feature.

[MartijnVisser]

@leonardBang Could you have a look at this PR or do you know who would be best to ask?

[MartijnVisser]

@limer2 Could you rebase your PR?

[creativedutchmen]

This would be super helpful to have merged. Are there any plans on pushing this forward?

[MartijnVisser]

If the PR gets rebased and the CI passes, someone could take a look most likely.