HiveServer2启动报TezConfiguration类NoClassDefFoundError错误

错误信息如下：

2021-01-03 20:11:26,355 WARN  [main] server.HiveServer2: Error starting HiveServer2 on attempt 1, will retry in 60000ms
java.lang.NoClassDefFoundError: org/apache/tez/dag/api/TezConfiguration
	at 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:318)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:232)
Caused by: java.lang.ClassNotFoundException: org.apache.tez.dag.api.TezConfiguration
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 16 more

虽然只是个Warn，但是这老长一段错，强迫症看不下去啊！

看起来像是缺少jar包，不过往上翻发现了一段很有意思的话：

2021-01-03 20:11:26,328 INFO  [main] server.HiveServer2: HS2 interactive HA not enabled. Starting tez sessions..

不对啊，我本来就没打算整合Tes的啊，最后搜索这句话发现，hive-site.xml添加以下配置可以解决：

<!-- 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，问题解决，但是为啥呢？到hive官网去没有找到这个配置项。Mark一下吧，日后再说。