[DO NOT MERGE] Flink 1.17

[je-ik]

Support Flink 1.17. Closes #29939.

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[dmvk]

Can you please link the commits with a corresponding JIRA issue?

[je-ik]

Can you please link the commits with a corresponding JIRA issue?

Beam no longer uses JIRA to track issues, but uses github issues instead. The commit is linked with the corresponding issue.

[Abacn]

Hi, what is the status of this PR? I see Flink validation runner postcommit test passed. Persumably this is complete?

[Abacn]

Also, previously Beam aims to support 4 consecutive flink versions. If find anything hard to support Flink 1.12 (or 1.13) and 1.17 at the same time, feel free to drop the former (or do it later)

[je-ik]

I need to polish and validate upgrade path so this is temporarily on hold.

[je-ik]

The upgrade is currently broken due to https://lists.apache.org/thread/s8o8jc2k2kb41q5g0v0xmoyszg1gdcst. After decision is made about the next steps this PR can continue.

[Abacn]

Hi, as https://lists.apache.org/thread/s8o8jc2k2kb41q5g0v0xmoyszg1gdcst gets resolved by #30403, is this PR ready to be merged?

[je-ik]

Hi, unfortunately I did not have time to finish it, yet. But target is currently release 2.56.0.

[Abacn]

Thanks, that's awesome!

[je-ik]

I verified the current implementation works and can read savepoint created by 1.16 (at least with the same beam version), but I need more tests regarding upgrade from current stable release. Moreover there is issue https://github.com/apache/beam/issues/29816 which seems to affect the current release as well. I would like to release 'new' runner without known severe bugs, so I think this should wait for one more release.

[je-ik]

Unfortunately, upgrading Flink has still issues with upgrading various sources (due to Java serialization). Upgrade from 2.55.0 to 2.56.0 (in my testing Pipeline) is blocked due to incompatible change of KafkaIO.Read (added option).

Having said that, upgrade from 2.56.0 Flink 1.16 to Flink 1.17 works and that is as far as we can get. We need to merge https://github.com/apache/beam/pull/30987 and then we would need to implement https://github.com/apache/beam/issues/30385 and ideally https://github.com/apache/beam/issues/21897.

Other than that, this is ready from my part @Abacn, with follow-up https://github.com/apache/beam/pull/30988.

[Abacn]

KafkaIO option change is #30877. It was having issue on upgrade compatibility. Let me check with the author if #30915 has fixed the upgrade issue

[je-ik]

I don't think we can do anything about that at this point. I tried adding serialVersionUID, but it ends on incompatible change of the AutoValue generated class. Upgrading KafkaIO has been for this reason broken several times in last releases, we need to resolve the underlying issue (not serializing sources to checkpoint using Serializable interface). Which will again be upgrade-breaking change.