Patch for NIS export V7
This fix tries a workaround for a threading issue when registering the CHIM classes (and hence does not apply to the Spark 1.4.1 branch).
Theory
Sometimes when registering the many RDDs of case classes as tables we run into a Scala 2.10 thread safety issue (described by Michael Armbrust who closed https://issues.apache.org/jira/browse/SPARK-2178 because it depends on https://issues.scala-lang.org/browse/SI-6240 - which will never be fixed.
The following are examples of the strange things that can happen - although not consistently:
- scala.reflect.runtime.ReflectError: value ch is not a package
- java.lang.RuntimeException: error reading Scala signature of ch.ninecode.model.BusBarSectionInfo: value model is not a package
- java.lang.NullPointerException
with this in the stack trace somewhere:
at ch.ninecode.model.Parseable.register(CHIM.scala:179)
at ch.ninecode.model._AssetInfo$.register(CHIM.scala:1396)
at ch.ninecode.model.CHIM.<init>(CHIM.scala:6279)