Spark NoSuchElementException：Spark Streaming app中的None.get

Question

我有一个Spark Streaming应用程序，直到昨天一直运行良好。 现在我在启动它后面临这个错误：

> ERROR Exception in task 0.0 in stage 0.0 (TID 0) (org.apache.spark.executor.Executor:91)
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:670)
    at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:289)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

之前从未给过我这个错误。我怎么解决这个问题？非常感谢你。