项目场景：
启动mysql后 启动hive,执行 show databases;后出现以下问题。或者在show databases时候报错：Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
在跟着尚硅谷数仓4.0视频学习的时候，所有都是按照视频中配置，hadoop版本为hadoop3.1.3,hive版本为hive3.1.2。之后就遇到了再启动hive服务之后，使用show databases,报错Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient。网上有视频说是hive的元服务没启动，使用hive --service metastore &启动元服务之后又报错：org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String；)[C。
最后把hive版本降到了2.3.9成功解决以上的两个问题。
hive2.3.9可以去清华大学开源软件镜像站自己手动下载，地址链接：https://mirrors.tuna.tsinghua.edu.cn/apache/hive/hive-2.3.9/
问题描述
FAILED: HiveException java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
原因分析：
该错误表明无法初始化元数据存储客户端的会话对象，即无法访问Hive元数据。
解决过程：
metadata服务开启
Hive的metadata服务未开启导致的。
解决办法：
进入到Hive的bin目录下,键入命令:
报错
MetaException(message:org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String;)[C)
at org.apache.hadoop.hive.metastore.RetryingHMSHandler.(RetryingHMSHandler.java:84)
at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:93)
at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:8661)
at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:8656)
at org.apache.hadoop.hive.metastore.HiveMetaStore.startMetaStore(HiveMetaStore.java:8926)
at org.apache.hadoop.hive.metastore.HiveMetaStore.main(HiveMetaStore.java:8843)
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.main(RunJar.java:212)
Caused by: java.lang.NoSuchMethodError: org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String;)[C
at org.apache.hadoop.hive.metastore.conf.MetastoreConf.getPassword(MetastoreConf.java:1537)
at org.apache.hadoop.hive.metastore.ObjectStore.getDataSourceProps(ObjectStore.java:606)
at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:349)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)
at org.apache.hadoop.hive.metastore.RawStoreProxy.(RawStoreProxy.java:59)
at org.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:67)
at org.apache.hadoop.hive.metastore.HiveMetaStore
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HMSHandler.newRawStoreForConf(HiveMetaStore.java:718) at org.apache.hadoop.hive.metastore.HiveMetaStore
HMSHandler.newRawStoreForConf(HiveMetaStore.java:718)atorg.apache.hadoop.hive.metastore.HiveMetaStoreHMSHandler.getMSForConf(HiveMetaStore.java:696)
at org.apache.hadoop.hive.metastore.HiveMetaStore
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HMSHandler.getMS(HiveMetaStore.java:690) at org.apache.hadoop.hive.metastore.HiveMetaStore
HMSHandler.getMS(HiveMetaStore.java:690)atorg.apache.hadoop.hive.metastore.HiveMetaStoreHMSHandler.createDefaultDB(HiveMetaStore.java:767)
at org.apache.hadoop.hive.metastore.HiveMetaStore
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HMSHandler.init(HiveMetaStore.java:538) 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.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.java:147) at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:108) at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:80) ... 10 more Exception in thread "main" MetaException(message:org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String;)[C) at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:84) at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:93) at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:8661) at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:8656) at org.apache.hadoop.hive.metastore.HiveMetaStore.startMetaStore(HiveMetaStore.java:8926) at org.apache.hadoop.hive.metastore.HiveMetaStore.main(HiveMetaStore.java:8843) 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.main(RunJar.java:212) Caused by: java.lang.NoSuchMethodError: org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String;)[C at org.apache.hadoop.hive.metastore.conf.MetastoreConf.getPassword(MetastoreConf.java:1537) at org.apache.hadoop.hive.metastore.ObjectStore.getDataSourceProps(ObjectStore.java:606) at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:349) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) at org.apache.hadoop.hive.metastore.RawStoreProxy.<init>(RawStoreProxy.java:59) at org.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:67) at org.apache.hadoop.hive.metastore.HiveMetaStore
HMSHandler.init(HiveMetaStore.java:538)atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)atjava.lang.reflect.Method.invoke(Method.java:498)atorg.apache.hadoop.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.java:147)atorg.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:108)atorg.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:80)...10moreExceptioninthread"main"MetaException(message:org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String;)[C)atorg.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:84)atorg.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:93)atorg.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:8661)atorg.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.java:8656)atorg.apache.hadoop.hive.metastore.HiveMetaStore.startMetaStore(HiveMetaStore.java:8926)atorg.apache.hadoop.hive.metastore.HiveMetaStore.main(HiveMetaStore.java:8843)atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)atjava.lang.reflect.Method.invoke(Method.java:498)atorg.apache.hadoop.util.RunJar.main(RunJar.java:212)Causedby:java.lang.NoSuchMethodError:org.apache.hadoop.conf.Configuration.getPassword(Ljava/lang/String;)[Catorg.apache.hadoop.hive.metastore.conf.MetastoreConf.getPassword(MetastoreConf.java:1537)atorg.apache.hadoop.hive.metastore.ObjectStore.getDataSourceProps(ObjectStore.java:606)atorg.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:349)atorg.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:73)atorg.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133)atorg.apache.hadoop.hive.metastore.RawStoreProxy.<init>(RawStoreProxy.java:59)atorg.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:67)atorg.apache.hadoop.hive.metastore.HiveMetaStoreHMSHandler.newRawStoreForConf(HiveMetaStore.java:718)
at org.apache.hadoop.hive.metastore.HiveMetaStore
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HMSHandler.getMSForConf(HiveMetaStore.java:696) at org.apache.hadoop.hive.metastore.HiveMetaStore
HMSHandler.getMSForConf(HiveMetaStore.java:696)atorg.apache.hadoop.hive.metastore.HiveMetaStoreHMSHandler.getMS(HiveMetaStore.java:690)
at org.apache.hadoop.hive.metastore.HiveMetaStore
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HMSHandler.createDefaultDB(HiveMetaStore.java:767) at org.apache.hadoop.hive.metastore.HiveMetaStore
HMSHandler.createDefaultDB(HiveMetaStore.java:767)atorg.apache.hadoop.hive.metastore.HiveMetaStoreHMSHandler.init(HiveMetaStore.java:538)
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.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.java:147)
at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:108)
at org.apache.hadoop.hive.metastore.RetryingHMSHandler.(RetryingHMSHandler.java:80)
… 10 more
[root@hadoop102 bin]#
解决新方案
把hive版本降到了2.3.9成功解决以上的两个问题。
hive2.3.9可以去清华大学开源软件镜像站自己手动下载，地址链接：https://mirrors.tuna.tsinghua.edu.cn/apache/hive/hive-2.3.9/
安装hive->配置环境变量->修改jar包冲突 -> 初始化元数据
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