khaledh opened a new pull request, #27137:
URL: https://github.com/apache/flink/pull/27137
## What is the purpose of the change
Flink currently uses protobuf-java 3.x, causing compatibility issues for
applications requiring protobuf 4.x. This upgrade to protobuf 4.32.1 enables:
- Applications to use protobuf 4.x features (e.g., Protobuf Editions)
- Resolution of dependency conflicts and forward compatibility as the
protobuf ecosystem moves toward 4.x
The `parquet-protobuf` integration required a compatibility patch
(`PatchedProtoWriteSupport`) because upstream parquet-java 1.15.2 still uses
protobuf 3.x APIs. This patch can be removed once parquet-java adds native
protobuf 4.x support (https://github.com/apache/parquet-java/issues/3175).
## Brief change log
- Upgrade protobuf-java from 3.x to 4.32.1
- Add `PatchedProtoWriteSupport` to maintain compatibility with
parquet-java 1.15.2 (which still uses protobuf 3.x APIs)
- Replace enum-based syntax detection (removed in protobuf 4.x) with
string-based detection
- All changes are internal - no public API changes
## Verifying this change
This change added tests and can be verified as follows:
- All existing tests pass (no regressions)
- New test suite `PatchedProtoWriteSupportTest` with 6 tests:
- 4 unit tests validating proto2/proto3 syntax detection with direct API
- 2 integration tests validating production code path through
`ParquetProtoWriters`
- Tests confirm round-trip write/read integrity for both proto2 and proto3
messages
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): **yes**
- 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, 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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