重试连接到服务器：hadoopmaster/IP:9000

Question

我安装了 Hadoop 2.9.0。我检查了从属节点中的 jps，在从属节点中是运行 datanode 和 nodemanager，在主节点中是 namenode 和 resourcemanager。请帮助，为什么这个错误？根据提供的解决方案，我禁用了 firewall、SELinux 和 IPv6。问题是网络 UI 中的 Live nodes 是 0。

/etc/hosts:

1       localhost
127.0.1.1       hadoopmaster

#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

192.168.111.154 hadoopmaster
192.168.111... hadoopslave1
192.168.111... hadoopslave2
192.168.111... hadoopslave3

所有节点中的配置：

核心-site.xml:

<configuration>
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://hadoopmaster:9000</value>
    </property>
</configuration>

yarn-site.xml:

<configuration>
<property>
   <name>yarn.nodemanager.aux-services</name>
   <value>mapreduce_shuffle</value>
 </property>
 <property>
   <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>
   <value>org.apache.hadoop.mapred.ShuffleHandler</value>
 </property>
 <property>
   <name>yarn.resourcemanager.resource-tracker.address</name>
   <value>hadoopmaster:8025</value>
 </property>
 <property>
   <name>yarn.resourcemanager.scheduler.address</name>
   <value>hadoopmaster:8030</value>
 </property>
 <property>
   <name>yarn.resourcemanager.address</name>
   <value>hadoopmaster:8050</value>
 </property>
</configuration>

netstat -nap | grep 9000 的输出：

tcp        0      0 127.0.1.1:9000          0.0.0.0:*               LISTEN      18205/java      
tcp        0      0 127.0.0.1:59048         127.0.1.1:9000          TIME_WAIT   -

我重新启动了 hadoop 并再次格式化了 namenode 但我仍然得到这个错误：(hadoop-hadoop-datanode-hadoopslave1.log)

2018-06-11 02:42:33,593 INFO org.apache.hadoop.ipc.Client: Retrying connect to server: hadoopmaster/192.168.111.154:9000. Already tried 4 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1000 MILLISECONDS)

Answer 1

我得到了解决方案。 编辑/etc/hosts

定义 FQDN
删除 127.0.1.1

重试连接到服务器：hadoopmaster/IP:9000

Retrying connect to server: hadoopmaster/IP:9000

hadoop

host

ufw