错误：

java.lang.NoClassDefFoundError: org/apache/tez/dag/api/TezConfigurationat org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolSession$AbstractTriggerValidator.startTriggerValidator(TezSessionPoolSession.java:74)at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.initTriggers(TezSessionPoolManager.java:207)at org.apache.hadoop.hive.ql.exec.tez.TezSessionPoolManager.startPool(TezSessionPoolManager.java:114)at org.apache.hive.service.server.HiveServer2.initAndStartTezSessionPoolManager(HiveServer2.java:839)at org.apache.hive.service.server.HiveServer2.startOrReconnectTezSessions(HiveServer2.java:822)at org.apache.hive.service.server.HiveServer2.start(HiveServer2.java:745)at org.apache.hive.service.server.HiveServer2.startHiveServer2(HiveServer2.java:1037)at org.apache.hive.service.server.HiveServer2.access$1600(HiveServer2.java:140)at org.apache.hive.service.server.HiveServer2$StartOptionExecutor.execute(HiveServer2.java:1305)at org.apache.hive.service.server.HiveServer2.main(HiveServer2.java:1149)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.hadoop.util.RunJar.run(RunJar.java:323)at org.apache.hadoop.util.RunJar.main(RunJar.java:236)
Caused by: java.lang.ClassNotFoundException: org.apache.tez.dag.api.TezConfigurationat java.net.URLClassLoader.findClass(URLClassLoader.java:387)at java.lang.ClassLoader.loadClass(ClassLoader.java:418)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)at java.lang.ClassLoader.loadClass(ClassLoader.java:351)... 16 more

修改hive-site.xml
加上这个(如果有就修改，没有就添加）

<!-- hiveserver2的高可用参数，开启此参数可以提高hiveserver2的启动速度 -->
<property><name>hive.server2.active.passive.ha.enable</name><value>true</value>
</property>

再次启动hiveserver2