1、在当前服务器启动hiveserver2服务，远程客户端通过beeline连接
报错信息如下：
root@master:~# beeline -u jdbc:hive2//master:10000 ls: cannot access /data1/hadoop/hive/lib/hive-jdbc-*-standalone.jar: No such file or directory SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/data1/hadoop/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/data1/hadoop/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory] scan complete in 1ms 19/06/17 06:29:13 [main]: ERROR beeline.ClassNameCompleter: Fail to parse the class name from the Jar file due to the exception:java.io.FileNotFoundException: org/ehcache/sizeof/impl/sizeof-agent.jar (No such file or directory) scan complete in 762ms #这里提示找不到文件或者目录 No known driver to handle "jdbc:hive2//master:10000" Beeline version 2.1.0 by Apache Hive beeline>
其实这个问题是由于jdbc协议地址写错造成的，在hive2之后少了个“：”
改成以下这个形式即可：
# beeline -u jdbc:hive2://master:10000 （这是在命令行直接输入）
或者
先输入beeline
然后输入：
!connect jdbc:hive2://master:10000
2、用户不被允许
# beeline -u jdbc:hive2://master:10000 -n root ls: cannot access /data1/hadoop/hive/lib/hive-jdbc-*-standalone.jar: No such file or directory SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/data1/hadoop/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/data1/hadoop/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory] Connecting to jdbc:hive2://master:10000 Error: Failed to open new session: java.lang.RuntimeException: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.authorize.AuthorizationException): User: root is not allowed to impersonate root (state=,code=0) Beeline version 2.1.0 by Apache Hive beeline>
（1）修改core-site.xml文件，加入如下选项：
<property>
<name>hadoop.proxyuser.root.hosts</name> #配置成*的意义，表示任意节点使用 hadoop 集群的代理用户 root 都能访问 hdfs 集群
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.root.groups</name> #表示代理用户的组所属
<value>*</value>
</property>
上述的proxyuser后面的root即是报错时User后面的用户，如：User: root is not allowed to
如果报错为：User: yjt is not allowed to，那么修改如下：
hadoop.proxyuser.yjt.hosts
hadoop.proxyuser.yjt.groups
这样改的原因：
主要原因是hadoop引入了一个安全伪装机制，使得hadoop 不允许上层系统直接将实际用户传递到hadoop层，而是将实际用户传递给一个超级代理，由此代理在hadoop上执行操作，避免任意客户端随意操作hadoop，如下图：
图上的超级代理是“Oozie”，你自己的超级代理是上面设置的proxyuser后面的“xxx”。
而hadoop内部还是延用linux对应的用户和权限。即你用哪个linux用户启动hadoop，对应的用户也就成为hadoop的内部用户
（2）在hdfs-sitx.xml文件添加：
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property>
上诉配置完以后，重新启动hadoop集群，其实只要hdfs就可以了。
接着执行如下命令：
/# beeline -u jdbc:hive2://master:10000 -n root ls: cannot access /data1/hadoop/hive/lib/hive-jdbc-*-standalone.jar: No such file or directory SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/data1/hadoop/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/data1/hadoop/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory] Connecting to jdbc:hive2://master:10000 Error: Failed to open new session: java.lang.RuntimeException: org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.security.authorize.AuthorizationException): User: root is not allowed to impersonate root (state=,code=0) Beeline version 2.1.0 by Apache Hive beeline>
what？？？，不对？？？
如果上诉配置正确，集群也已经重启，还是报这样的错误，那么查看一下启动hiveserver2的机器是否启动了namenode节点？
（1）如果没有启动namenode节点，那么查看你配置的用户(这里是root用户)是否有对应的操作hdfs目录的权限(权限控制可能会导致该错误)
（2）如果该节点启动了namenode，那么使用 hdfs haadmin -getAllServiceState 检查该节点的namenode的状态是否是standby。如果是，kill掉，让该节点的namenode变成active。
我碰到的问题就是上诉2，也就是namenode节点是standby。
kill掉以后，再试试
root@master:/# hdfs haadmin -getAllServiceState master:8020 standby slave1:8020 active root@master:/# hdfs haadmin -getAllServiceState master:8020 active 19/06/17 08:49:08 INFO ipc.Client: Retrying connect to server: slave1/172.17.0.3:8020. Already tried 0 time(s); retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=1, sleepTime=1000 MILLISECONDS) slave1:8020 Failed to connect: Call From master/172.17.0.2 to slave1:8020 failed on connection exception: java.net.ConnectException: Connection refused; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused root@master:/# beeline -u jdbc:hive2://master:10000 -n root ls: cannot access /data1/hadoop/hive/lib/hive-jdbc-*-standalone.jar: No such file or directory SLF4J: Class path contains multiple SLF4J bindings. SLF4J: Found binding in [jar:file:/data1/hadoop/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: Found binding in [jar:file:/data1/hadoop/hadoop/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class] SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation. SLF4J: Actual binding is of type [org.apache.logging.slf4j.Log4jLoggerFactory] Connecting to jdbc:hive2://master:10000 Connected to: Apache Hive (version 2.1.0) Driver: Hive JDBC (version 2.1.0) 19/06/17 08:49:16 [main]: WARN jdbc.HiveConnection: Request to set autoCommit to false; Hive does not support autoCommit=false. Transaction isolation: TRANSACTION_REPEATABLE_READ Beeline version 2.1.0 by Apache Hive 0: jdbc:hive2://master:10000>
0: jdbc:hive2://master:10000> show databases;
OK
+----------------+--+
| database_name |
+----------------+--+
| default |
| myhive |
+----------------+--+
发现正常连接了。
借鉴：https://blog.csdn.net/qq_16633405/article/details/82190440