koert kuipers created SPARK-8577:
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             Summary: ScalaReflectionLock.synchronized can cause deadlock
                 Key: SPARK-8577
                 URL: https://issues.apache.org/jira/browse/SPARK-8577
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.4.0
            Reporter: koert kuipers
            Priority: Minor


Just a heads up, i was doing some basic coding using DataFrame, Row, 
StructType, etc. in my own project and i ended up with deadlocks in my sbt 
tests due to the usage of ScalaReflectionLock.synchronized in the spark sql 
code.
the issue went away when i changed my build to have:
  parallelExecution in Test := false
so that the tests run consecutively...



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