./start-dfs.sh
然后我得到了：
Starting namenodes on [ec2-3-212-99-195.compute-1.amazonaws.com]
ec2-3-212-99-195.compute-1.amazonaws.com: starting namenode, logging to /home/ec2-user/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-ec2-user-namenode-ip-172-31-80-245.out
The authenticity of host 'ip-172-31-91-40 (34.225.65.17)' can't be established.
RSA key fingerprint is 84:64:4c:84:98:2b:c2:4b:ca:98:15:1d:10:6f:46:ce.
Are you sure you want to continue connecting (yes/no)? The authenticity of host 'ip-172-31-83-169 (34.204.115.105)' can't be established.
RSA key fingerprint is 84:64:4c:84:98:2b:c2:4b:ca:98:15:1d:10:6f:46:ce.
Are you sure you want to continue connecting (yes/no)? ip-172-31-82-16: starting datanode, logging to /home/ec2-user/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-ec2-user-datanode-ip-172-31-82-16.out
其中一个Datanode正在运行，但其他两个没有响应 Namenode和SecondaryNamenode也可以运行，需要帮助， 有人知道发生了什么事吗？