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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2021/02/24 22:05:08 UTC

[GitHub] [flink] AHeise opened a new pull request #15013: [FLINK-21490][datastream] Make job graph generation deterministic in respect to hashes of input nodes.

AHeise opened a new pull request #15013:
URL: https://github.com/apache/flink/pull/15013

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## What is the purpose of the change

Traversing the stream graph randomly for different input nodes during job graph generation causes the gates of multi-input operators to be swapped on restart. Unaligned checkpoints build on the assumption that the order is deterministic though.

## Brief change log

- Make job graph generation deterministic in respect to hashes of input nodes.

## Verifying this change

Added unit test `StreamingJobGraphGeneratorTest.java#testDeterministicUnionOrder`. An upcoming ITCase for unaligned checkpoint rescaling will cover it further.

## 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/Mesos, 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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