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  1. ,

    In Scala, don’t use the get method with Option to access a result. Use getOrElse, a match expression, or foreach instead.

java.util.NoSuchElementException: None.get	at scala.None$.get(Option.scala:347)	at scala.None$.get(Option.scala:345)	at org.apache.spark.storage.BlockInfoManager.releaseAllLocksForTask(BlockInfoManager.scala:343)	at org.apache.spark.storage.BlockManager.releaseAllLocksForTask(BlockManager.scala:644)	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:281)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)