解決方案寫在前面：在spark-env.sh裡有個引數 SPARK_LOCAL_DIRS，是存放shuffle資料落盤的目錄，這個報錯就是這個目錄不存在導致的。建立目錄重啟worker，再將核數和記憶體均衡一下。

附錄一下報錯：

18/03/29 09:59:01 ERROR Worker: Failed to launch executor app-20180329063203-1549/1642 for Mobius.di.2::bdp-141. [dispatcher-event-loop-21]
java.io.IOException: No subfolder can be created in
 
 .
    at org.apache.spark.deploy.worker.Worker$$anonfun$receive$1$$anonfun$9.apply(Worker.scala:499)
    at org.apache.spark.deploy.worker.Worker$$anonfun$receive$1$$anonfun$9.apply(Worker.scala:484)
    at scala.collection.MapLike$class.getOrElse(MapLike.scala:128)
    at scala.collection.AbstractMap
 
.getOrElse(Map.scala:59)
    at org.apache.spark.deploy.worker.Worker$$anonfun$receive$1.applyOrElse(Worker.scala:484)
	at org.apache.spark.rpc.netty.Inbox$$anonfun$process$1.apply$mcV$sp(Inbox.scala:117)
    at org.apache.spark.rpc.netty.Inbox.safelyCall(Inbox.scala:205)
    at org.apache.spark.rpc.netty
 
.Inbox.process(Inbox.scala:101)
    at org.apache.spark.rpc.netty.Dispatcher$MessageLoop.run(Dispatcher.scala:213)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)