[GitHub] incubator-spark pull request: Added extra description on ValueErro...

[JoshRosen]

Github user JoshRosen commented on the pull request:

    https://github.com/apache/incubator-spark/pull/581#issuecomment-34795439
  
    In [SPARK-972](https://spark-project.atlassian.net/browse/SPARK-972), my 
intent was to log the _call site_ of the original SparkContext construction to 
help figure out when/where it was created.  Logging the address that the 
original SparkContext connected to is an improvement over what we have now, but 
it doesn't help to debug cases where some complex user-written initialization 
code resulted in the creation of multiple SparkContexts connected to the same 
master.  [SPARK-991](https://spark-project.atlassian.net/browse/SPARK-991), 
which appears to have been resolved in #311, lays the groundwork for recording 
call sites.