snmvaughan opened a new pull request, #39746:
URL: https://github.com/apache/spark/pull/39746
### What changes were proposed in this pull request?
Update `SparkBuild.scala` to force SBT use of `protobuf-java` to match the
Maven version. The Maven dependencyManagement section forces `protobuf-java`
to use `2.5.0`, but SBT is using `3.14.0`.
### Why are the changes needed?
Define `protoVersion` in `SparkBuild.scala` and use it in
`DependencyOverrides` to force the SBT version of `protobuf-java` to match the
setting defined in the Maven top-level `pom.xml`. Add comments to both
`pom.xml` and `SparkBuild.scala` to ensure that the values are kept in sync.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Before the update, SBT reported using `3.14.0`:
```
% build/sbt dependencyTree | grep proto | sed 's/^.*-com/com/' | sort | uniq
-c
8 com.google.protobuf:protobuf-java:2.5.0 (evicted by: 3.14.0)
70 com.google.protobuf:protobuf-java:3.14.0
```
After the patch is applied, SBT reports using `2.5.0`:
```
% build/sbt dependencyTree | grep proto | sed 's/^.*-com/com/' | sort | uniq
-c
70 com.google.protobuf:protobuf-java:2.5.0
```
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