sarutak opened a new pull request #29927:
URL: https://github.com/apache/spark/pull/29927
### What changes were proposed in this pull request?
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This PR fixes `SparkBuild.scala` to recognize build settings for Scala 2.13.
In `SparkBuild.scala`, a variable `scalaBinaryVersion` is hardcoded as
`2.12`.
So, an environment variable `SPARK_SCALA_VERSION` is also to be `2.12`.
This issue causes some test suites (e.g. `SparkSubmitSuite`) to be error.
```
===== TEST OUTPUT FOR o.a.s.deploy.SparkSubmitSuite: 'user classpath first
in driver' =====
20/10/02 08:55:30.234 redirect stderr for command
/home/kou/work/oss/spark-scala-2.13/bin/spark-submit INFO Utils: Error: Could
not find or load m
ain class org.apache.spark.launcher.Main
20/10/02 08:55:30.235 redirect stderr for command
/home/kou/work/oss/spark-scala-2.13/bin/spark-submit INFO Utils:
/home/kou/work/oss/spark-scala-
2.13/bin/spark-class: line 96: CMD: bad array subscript
```
The reason of this error is that environment variables `SPARK_JARS_DIR` and
`LAUNCH_CLASSPATH` is defined in `bin/spark-class` as follows.
```
SPARK_JARS_DIR="${SPARK_HOME}/assembly/target/scala-$SPARK_SCALA_VERSION/jars"
LAUNCH_CLASSPATH="${SPARK_HOME}/launcher/target/scala-$SPARK_SCALA_VERSION/classes:$LAUNCH_CLASSPATH"
```
### Why are the changes needed?
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To build for Scala 2.13 successfully.
### Does this PR introduce _any_ user-facing change?
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the documentation fix.
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the released Spark versions or within the unreleased branches such as master.
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No.
### How was this patch tested?
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`SparkSubmitSuite` finishes successfully.
```
build/sbt -Pscala-2.13 clean "core/testOnly
org.apache.spark.deploy.SparkSubmitSuite"
```
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