Github user yjshen commented on the pull request:
https://github.com/apache/flink/pull/1870#issuecomment-208661457
The build failure seems unrelated to this PR:
```
[INFO] Compiling 43 source files to
/home/travis/build/apache/flink/flink-libraries/flink-ml/target/classes at
1460411368867
[ERROR] error: error while loading <root>, error in opening zip file
[ERROR] error: scala.reflect.internal.MissingRequirementError: object
scala.runtime in compiler mirror not found.
[ERROR] at
scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:16)
[ERROR] at
scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:17)
```
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