Hadoop3:连接到ResourceManager的工作节点错误

Question

我有一个3节点hadoop集群(DigitalOcean液滴)：

• hadoop-master被配置为namenode和datanode。
• hadoop-worker2 1和hadoop-worker2 2被配置为datanodes。

每当我运行mapreduce流作业，并且选择一个工人节点来运行ApplicationMaster时，作业就会挂起，因为它试图连接到ResourceManager。datanode日志显示它试图连接到0.0.0.0

INFO [main] org.apache.hadoop.yarn.client.RMProxy: Connecting to ResourceManager at /0.0.0.0:8030
INFO [main] org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8030. Already tried 0 time(s);
INFO [main] org.apache.hadoop.ipc.Client: Retrying connect to server: 0.0.0.0/0.0.0.0:8030. Already tried 1 time(s);

这是yarn.resourcemanager.hostname property的默认值。但是，我已经为我的两个工作节点在ser-site.xml中指定了这个属性：

<property>
   <name>yarn.resourcemanager.hostname</name>
   <value>hadoop-master</value>
</property>

在我的所有节点上，我的/etc/host文件看起来都是这样的，因此hadoop-master应该指向正确的IP地址。

#127.0.1.1 hadoop-worker1 hadoop-worker1
127.0.0.1 localhost

# 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
#ff02::3 ip6-allhosts

165.22.19.161 hadoop-master
165.22.19.154 hadoop-worker1
165.22.19.158 hadoop-worker2

我还检查了配置，方法是转到hadoop- worker 1:9864，并访问worker节点的web接口，查看加载了什么：

<property>
<name>yarn.resourcemanager.hostname</name>
<value>hadoop-master</value>
<final>false</final>
<source>yarn-site.xml</source>
</property>

更重要的是，我尝试从其中一个工作节点运行一个纱线命令，它实际上可以正确地与ResourceManager联系：

hadoop@hadoop-worker1:/opt/hadoop$ yarn node --list
2019-06-15 18:47:42,119 INFO client.RMProxy: Connecting to ResourceManager at hadoop-master/165.22.19.161:8032
Total Nodes:3
         Node-Id             Node-State Node-Http-Address       Number-of-Running-Containers
hadoop-worker2:40673            RUNNING hadoop-worker2:8042                                0
hadoop-worker1:41875            RUNNING hadoop-worker1:8042                                1
hadoop-master:40075             RUNNING hadoop-master:8042                                 0
hadoop@hadoop-worker1:/opt/hadoop$

我不知道该做什么，我相信这可能与流作业没有正确加载设置有关，任何帮助都将不胜感激，因为我已经在这个问题上被困了2天。

Answer 1

我已经将-D yarn.resourcemanager.hostname=hadoop-master标志添加到映射的流命令中，它现在似乎起作用了。