错误如下：
因为我配置spark的历史纪录文件夹的路径在hdfs上面，spark需要访问hdfs，所以编辑spark-defaults.conf文件的时候，spark.eventLog.dir的值的主机名端口号要和你hadoop中配置文件core-site中fs.defaultFS的值一致，并且文件夹要已经存在。
比如我的如上所示，我把spark.eventLog.dir改为hdfs://hadoop102:9000/directory就行了
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无法访问hadoop102:50070
异常: Call From * 9000 failed on connection exception: java.net.ConnectException: Connection refused: no further information; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused
ls: Call From hdoop2/192.168.18.87 to hdoop2:8020 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see
java.net.ConnectException: Call From slaver1/192.168.19.128 to slaver1:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org
Call From master/192.168.128.135 to master:8485 failed on connection exception: java.net.ConnectException: Connection refused
ssh: connect to host hadoop102 port 22: No route to host
Error: java.net.ConnectException: Call From tuge1/192.168.40.100 to tuge2:8032 failed on connection exception
hadoop 遇到java.net.ConnectException: to 0.0.0.0:10020 failed on connection
Caused by: java.net.ConnectException: Call From master/192.168.199.130 to master:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.
java.io.IOException: java.net.ConnectException: Call From master/192.168.58.128 to master:10020 failed on connection exception: java.net.ConnectException: 拒绝连接;