一、User: xx is not allowed to impersonate xxx'
解决办法：修改 core-site.xml 文件，加入下面的内容后重启 hadoop。
<property><name>hadoop.proxyuser.xx.hosts</name><value>*</value>
</property><property><name>hadoop.proxyuser.xx.groups</name><value>*</value>
</property>Tips：注意是 xx 不是 xxx
二、ACCEPTED: waiting for AM container to be allocated, launched and register with RM.
现象为：
- 查看 node 的健康状态：http://master:8088/cluster/cluster ，无活跃 node
- pyhive 执行 insert 命令卡住，一直处于 accept 状态。
- YarnApplicationState 为：ACCEPTED: waiting for AM container to be allocated, launched and register with RM.
- slave yarn 日志为：Retrying connect to server: 0.0.0.0/0.0.0.0:8031. Already tried 0 time(s); retry policy is...
解决办法：
切记启动 hdfs 后，要配置启动 yarn。配置如下：
<configuration><property> <name>yarn.resourcemanager.address</name> <value>master:8032</value> </property> <property> <name>yarn.resourcemanager.scheduler.address</name> <value>master:8030</value> </property> <property> <name>yarn.resourcemanager.resource-tracker.address</name> <value>master:8031</value> </property><property><name>yarn.nodemanager.aux-services</name><value>mapreduce_shuffle</value></property>
</configuration>
)
