我的spark mater少了一个datanode，不能够访问50070？

配置：centos7、jdk1.7、hadoop2.4.1、三台spark虚拟机(spark02,spark03,spark04).其中spark02:有datanode,namenode,screndnode,jps。这里老师的有datanode而我没有。其它两台都有jps,datanode

在hdfs-site.xml里加上对外访问的端口：

dfs.http.address
0.0.0.0:50070

0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-root-secondarynamenode-spark02.out
18/12/19 11:29:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[root@spark02 local]# jps
6329 Jps
5746 NameNode
6158 SecondaryNameNode