Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/5344#issuecomment-89234547
It's helpful to post the error here:
```
[error] * method toString(Int,Int)java.lang.String in trait
org.apache.spark.mllib.linalg.Matrix does not have a correspondent in old
version
[error] filter with:
ProblemFilters.exclude[MissingMethodProblem]("org.apache.spark.mllib.linalg.Matrix.toString")
java.lang.RuntimeException: spark-mllib: Binary compatibility check failed!
```
You've added a method to a trait, which is an incompatibility in general.
However this is a sealed trait, so think it can be excluded. Still, I'd wait to
see if a maintainer thinks it's worth adding this API method; I'm neutral.
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