Github user srowen commented on the issue:
https://github.com/apache/spark/pull/16871
Darn. The Maven master 2.10 build is fine but not SBT: `[error] 'jvm-1.8'
is not a valid choice for '-target'`
It might work to output 1.7 bytecode from SBT just for 2.10. Maybe I'm
overlooking why that wouldn't work, but, setting source/target to 1.7 for 2.10
is a good place to start. I can try that.
Another option is to ignore it, because the SBT build is a convenience
build and perhaps not many people are developing against Spark 2.2 and still on
Scala 2.10.
Another options is to go farther and drop 2.10 support. I wouldn't want to
do that solely because of this, but if others favored dropping 2.10 support
that would also make this not a problem.
It's possible to roll back but let's exhaust the other options above first.
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