Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18645
The status here is that this change does work fine with Scala 2.11, and
does implement changes that will be needed for 2.12. Right now I've found that,
suddenly, it doesn't compile for Scala 2.12:
```
[error]
/Users/srowen/Documents/Cloudera/spark/core/src/test/scala/org/apache/spark/FileSuite.scala:100:
could not find implicit value for parameter kcf: () =>
org.apache.spark.WritableConverter[org.apache.hadoop.io.IntWritable]
[error] Error occurred in an application involving default arguments.
[error] val output = sc.sequenceFile[IntWritable, Text](outputDir)
[error] ^
[error]
/Users/srowen/Documents/Cloudera/spark/core/src/test/scala/org/apache/spark/FileSuite.scala:131:
could not find implicit value for parameter kcf: () =>
org.apache.spark.WritableConverter[org.apache.hadoop.io.IntWritable]
[error] Error occurred in an application involving default arguments.
[error] val output = sc.sequenceFile[IntWritable, Text](outputDir)
```
I didn't see this with earlier 2.12, I believe, so could be some change or
problem in implicit resolution.
Of course, the 2.12 build never was going to work fully after this change
anyway (Kafka 0.8 needs to go, REPL needs to update) so maybe worth going for
anyway.
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