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Scala 2.13 Notes

Currently the RAPIDS Accelerator for Apache Spark can be built with Scala 2.13 only with Apache Spark versions 3.3.0 and higher. It does not support Cloudera or Databricks distributions of Apache Spark. You can only use the Scala 2.13 plugin JAR with an Apache Spark distribution compiled with Scala 2.13.

Notes on source organization

For some parts of the code, we need to have specific versions of Scala code for both Scala 2.12 and 2.13. You will see these organized using the following directory pattern:

spark-rapids/<module>/src/main/scala-<scala_version>/<path to package>/Source.scala

This is necessary in a handful of cases where there are distinct differences in the language requirements needed. First, try to ensure the same code compiles with both Scala 2.12 and 2.13. If you must diverge the code for supporting the different languages, please ensure that you refactor the code as much as possible to avoid any code duplication that might occur.

Building with Scala 2.13

You can use Maven to build the plugin. Like with Scala 2.12, we recommend building up to the verify phase.

cd scala2.13
mvn verify

After a successful build, the RAPIDS Accelerator jar will be in the scala2.13/dist/target/ directory. This will build the plugin for a single version of Spark. By default, this is Apache Spark 3.3.0. To build against other versions of Spark you use the -Dbuildver=XXX command line option to Maven. For instance to build Spark 3.3.0 you would use:

mvn -Dbuildver=330 verify

See CONTRIBUTING for more information on how to use Maven to build the plugin. All of the options used for Scala 2.12 apply to Scala 2.13

You can also use the buildall script in the parent directory to build against all supported versions of Apache Spark.

cd ..
./build/buildall --profile=noSnapshotsScala213

Or if you want to build against multiple specific versions of Spark, you can specify the --scala213 argument:

./build/buildall --profile=330,340 --scala213

Updating build files for Scala 2.13

If you make changes in the parent pom.xml or any other of the module pom.xml files, you must run the following command to sync the changes between the Scala 2.12 and 2.13 pom files:

./build/make-scala-version-build-files.sh 2.13

That way any new dependencies or other changes will be picked up in the Scala 2.13 build.

IDE Integration with IntelliJ

You should be able to open the scala2.13 directory directly in IntelliJ as a separate project. You can build and debug as normal, although there are slight differences in how to navigate the source. In particular, when you select a particular build profile, you will only be able to navigate the source used by modules that are included for that spark version.