我是hadoop的新手，我最近部署了2个分布式hadoop系统来运行opentsdb。主机A与从机一起是主机，主机B是从机。 在机器A中编辑/ etc / hosts：
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
10.94.212.144 node1
10.48.22.52 node2
我没有机器B的root权限，无法修改B＆etc / hosts / hosts，所以在B＆＃39的core-site.xml中，我写道： / p>
<property>
<name>fs.default.name</name>
<value>hdfs://10.94.212.144:49000</value>
</property>
在A fs.default.name中是node1：49000 A是主设备，A，B都是从设备，当我运行start-dfs.sh时，namenode，datanode1正常启动，但datanode2无法启动错误：
2016-11-15 12:42:43,103 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 0 time(s).
2016-11-15 12:42:44,106 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 1 time(s).
2016-11-15 12:42:45,109 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 2 time(s).
2016-11-15 12:42:46,112 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 3 time(s).
2016-11-15 12:42:47,115 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 4 time(s).
2016-11-15 12:42:48,117 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 5 time(s).
2016-11-15 12:42:49,120 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 6 time(s).
2016-11-15 12:42:50,123 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 7 time(s).
2016-11-15 12:42:51,125 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 8 time(s).
2016-11-15 12:42:52,128 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: /10.94.212.144:49000. Already tried 9 time(s).
这是网络问题吗？但是当我使用ssh连接A和B时，它没问题。还有什么其他原因？好几天一直困扰着我......