java.lang.IllegalStateException: Shutdown hooks cannot be modified during shutdown.
sbt.ForkMain$ForkError: java.lang.IllegalStateException: Shutdown hooks cannot be modified during shutdown.
at org.apache.spark.util.SparkShutdownHookManager.add(ShutdownHookManager.scala:195)
at org.apache.spark.util.ShutdownHookManager$.addShutdownHook(ShutdownHookManager.scala:153)
at org.apache.spark.storage.DiskBlockManager.addShutdownHook(DiskBlockManager.scala:145)
at org.apache.spark.storage.DiskBlockManager.<init>(DiskBlockManager.scala:51)
at org.apache.spark.storage.BlockManager.<init>(BlockManager.scala:80)
at org.apache.spark.SparkEnv$.create(SparkEnv.scala:321)
at org.apache.spark.SparkEnv$.createDriverEnv(SparkEnv.scala:165)
at org.apache.spark.SparkContext.createSparkEnv(SparkContext.scala:258)
at org.apache.spark.SparkContext.<init>(SparkContext.scala:426)
at org.apache.spark.SparkContext.<init>(SparkContext.scala:130)
at org.apache.spark.SharedSparkContext$class.beforeAll(SharedSparkContext.scala:34)
at org.apache.spark.PartitioningSuite.beforeAll(PartitioningSuite.scala:28)
at org.scalatest.BeforeAndAfterAll$class.beforeAll(BeforeAndAfterAll.scala:187)
at org.apache.spark.SparkFunSuite.beforeAll(SparkFunSuite.scala:29)
at org.scalatest.BeforeAndAfterAll$class.run(BeforeAndAfterAll.scala:253)
at org.apache.spark.SparkFunSuite.run(SparkFunSuite.scala:29)
at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:357)
at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:502)
at sbt.ForkMain$Run$2.call(ForkMain.java:296)
at sbt.ForkMain$Run$2.call(ForkMain.java:286)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)