Hadoop3：连接到 ResourceManager 的工作节点错误

Question

我有一个 3 节点的 hadoop 集群（DigitalOcean 液滴）：

hadoop-master 同时配置为 namenode 和 datanode
hadoop-worker1 和 hadoop-worker2 配置为数据节点

每当我运行一个 mapreduce 流作业和一个工作节点被选择到运行 ApplicationMaster 时，该作业在尝试连接到 ResourceManager 时挂起。 datanode 日志显示它尝试连接到 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);

也就是默认值yarn.resourcemanager.hostname property。但是我在 yarn-site.xml 中为我的两个工作节点指定了这个属性：

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

在我所有的节点上，我的 /etc/hosts 文件看起来像这样，所以 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-worker1:9864 并访问工作节点的 Web 界面以查看加载的内容：

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

甚至，我尝试运行从其中一个工作节点执行 YARN 命令，它实际上可以正确联系 ResourceManager：

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$

我不确定该怎么做，我相信这可能与流媒体作业没有正确加载设置有关，任何帮助将不胜感激，因为我已经在这个问题上停留了 2 天。

Answer 1

我已将 -D yarn.resourcemanager.hostname=hadoop-master 标志添加到 mapred 流式传输命令，它现在似乎可以工作了。

Hadoop3：连接到 ResourceManager 的工作节点错误

Hadoop3: worker node error connecting to ResourceManager

java

hadoop

mapreduce

hadoop-yarn

hadoop-streaming