mesos/spark — pull request #412 by pwendell (2013-01-24 22:32:37+00:00)
Title: SPARK-541: Adding a warning for invalid Master URL

Right now Spark silently parses master URL's which do not match any
known regex as a Mesos URL. The Mesos error message when an invalid URL gets
passed is really confusing, so this warns the user when the implicit
conversion is happening.