我使用http://pingax.com/install-apache-hadoop-ubuntu-cluster-setup/设置了4个节点hadoop群集：
Namenode：node04 Datanode：node01 Datanode：node02 Datanode：node03
我只能在群集中看到两个节点（node01，node03）。 Node02的日志错误消息为：
2015-12-11 10:15:18,698 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node04/127.17.0.224:9000. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-12-11 10:15:19,699 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node04/127.17.0.224:9000. Already tried 1 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
2015-12-11 10:15:20,699 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: node04/127.17.0.224:9000. Already tried 2 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)
每个节点/ etc / hosts包含以下内容：
127.0.0.1 localhost
127.17.0.221 node01
127.17.0.222 node02
127.17.0.223 node03
127.17.0.224 node04
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
/ etc / hadoop / masters包含node04，/ etc / hadoop / slaves包含node01 node02和node03
请你帮我理解如何去做吗？ 谢谢！
答案 0 :(得分：0)
执行以下操作：
telnet node04 9000和ping node04命令
确认node02和node04之间存在连接性答案 1 :(得分：0)