16/12/24 10:30:19 WARN AppClient$ClientEndpoint: Failed to connect to master fengbindeMacBook-Pro.local:7077
java.lang.RuntimeException: java.io.InvalidClassException: org.apache.spark.rpc.netty.RequestMessage; local class incompatible: stream classdesc serialVersionUID = -2221986757032131007, local class serialVersionUID = -5447855329526097695
at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:617)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1622)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1517)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1771)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at org.apache.spark.serializer.JavaDeserializationStream.readObject(JavaSerializer.scala:75)
最近出现了这么一个问题，出现这个问题只有一个原因：客户端的类与服务端的类版本不同步，也就是说客户端下载的jar包和服务端的jar包不一致。
解决的方法是：根据异常信息提示的类名找到该jar包，将服务器上用来下载的jar包与服务器真正应用的jar包同步。
spark code 的版本有误, 客户端版本spark-core_2.10 服务端版本是spark-core_2.11
将两个版本统一下就ok