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Instructions for generating protobuf (#27402)

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* Instructions for generating protobuf

* Update CONTRIBUTING.md

Co-Authored-By: Arnout Engelen <github@bzzt.net>
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Christopher Batey 2019-07-24 10:25:53 +01:00 • committed by GitHub
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CONTRIBUTING.md
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@ -253,6 +253,17 @@ All wire protocol changes that may concern rolling upgrades should be documented
[Rolling Update Changelog](https://doc.akka.io/docs/akka/current/project/rolling-update.html#change-log) [Rolling Update Changelog](https://doc.akka.io/docs/akka/current/project/rolling-update.html#change-log)
(found in akka-docs/src/main/paradox/project/rolling-update.md) (found in akka-docs/src/main/paradox/project/rolling-update.md)
## Protobuf
Akka includes a shaded version of protobuf `2.5.0` that is used for internal communication. To generate files
run `protobufGenerate`. The generated files are put in the `src/main/java` of each project and need to be commited.
The generated files are automatically transformed to use the shaded version of protobuf.
Generation depends on protoc `2.5.0` being on the path. Old versions of
protoc can be downloaded from the [protobuf release page](https://github.com/protocolbuffers/protobuf/releases) and built from
source or downloaded from [maven central](http://repo1.maven.org/maven2/com/google/protobuf/protoc/2.5.0/). See
[Protobuf.scala](https://github.com/akka/akka/blob/master/project/Protobuf.scala) for details of how to override
the settings for generation.
## Pull request requirements ## Pull request requirements