启动metastore服务报错

启动Metastore的时候报错：

简略的报错信息：

 MetaException(message:Error creating transactional connection factory)Caused by: MetaException(message:Error creating transactional connection factory)Caused by: javax.jdo.JDOFatalInternalException: Error creating transactional connection factory
NestedThrowables:Caused by: java.lang.reflect.InvocationTargetExceptionCaused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the "HikariCP" plugin t                                            o create a ConnectionPool gave an error : Failed to initialize pool: Communications link failureCaused by: com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize po                                            ol: Communications link failureCaused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failureCaused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failureCaused by: java.net.ConnectException: 拒绝连接 (Connection refused)

完整的报错信息：

 MetaException(message:Error creating transactional connection factory)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:84)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:9                                            3)at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.jav                                            a:8661)at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.jav                                            a: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.run(RunJar.java:323)at org.apache.hadoop.util.RunJar.main(RunJar.java:236)
Caused by: MetaException(message:Error creating transactional connection factory)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.                                            java:208)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:108                                            )at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:80)... 11 more
Caused by: javax.jdo.JDOFatalInternalException: Error creating transactional connection factory
NestedThrowables:
java.lang.reflect.InvocationTargetExceptionat org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDO                                            Helper.java:671)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenc                                            eManagerFactory.java:830)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(J                                            DOPersistenceManagerFactory.java:334)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOP                                            ersistenceManagerFactory.java:213)at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)at java.security.AccessController.doPrivileged(Native Method)at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:                                            1166)at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)at org.apache.hadoop.hive.metastore.ObjectStore.getPMF(ObjectStore.java:650)at org.apache.hadoop.hive.metastore.ObjectStore.getPersistenceManager(ObjectStore.java:69                                            3)at org.apache.hadoop.hive.metastore.ObjectStore.initializeHelper(ObjectStore.java:483)at org.apache.hadoop.hive.metastore.ObjectStore.initialize(ObjectStore.java:420)at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:375)at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:79)at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:139)at org.apache.hadoop.hive.metastore.RawStoreProxy.<init>(RawStoreProxy.java:59)at org.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:67)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.newRawStoreForConf(HiveMetaS                                            tore.java:718)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMSForConf(HiveMetaStore.j                                            ava:696)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:690                                            )at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStor                                            e.java:773)at org.apache.hadoop.hive.metastore.HiveMetaStore$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)... 13 more
Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.GeneratedConstructorAccessor74.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccesso                                            rImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPl                                            uginRegistry.java:606)at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:330)at org.datanucleus.store.AbstractStoreManager.registerConnectionFactory(AbstractStoreMana                                            ger.java:203)at org.datanucleus.store.AbstractStoreManager.<init>(AbstractStoreManager.java:162)at org.datanucleus.store.rdbms.RDBMSStoreManager.<init>(RDBMSStoreManager.java:285)at sun.reflect.GeneratedConstructorAccessor73.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccesso                                            rImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPl                                            uginRegistry.java:606)at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:301)at org.datanucleus.NucleusContextHelper.createStoreManagerForProperties(NucleusContextHel                                            per.java:133)at org.datanucleus.PersistenceNucleusContextImpl.initialise(PersistenceNucleusContextImpl                                            .java:422)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenc                                            eManagerFactory.java:817)... 43 more
Caused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the "HikariCP" plugin t                                            o create a ConnectionPool gave an error : Failed to initialize pool: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactor                                            yImpl.java:232)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.initialiseDataSources(ConnectionFact                                            oryImpl.java:117)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.<init>(ConnectionFactoryImpl.java:82                                            )... 59 more
Caused by: com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize po                                            ol: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(HikariPool.java:544                                            )at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:536)at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:112)at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:72)at org.datanucleus.store.rdbms.connectionpool.HikariCPConnectionPoolFactory.createConnect                                            ionPool(HikariCPConnectionPoolFactory.java:176)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactor                                            yImpl.java:213)... 61 more
Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapp                                            ing.java:64)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828)at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448)at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241)at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:95)at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:101)at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:356)at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:199)at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:444)at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:515)... 65 more
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at sun.reflect.GeneratedConstructorAccessor77.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccesso                                            rImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactor                                            y.java:167)at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89)at com.mysql.cj.NativeSession.connect(NativeSession.java:119)at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:948)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:818)... 74 more
Caused by: java.net.ConnectException: 拒绝连接 (Connection refused)at java.net.PlainSocketImpl.socketConnect(Native Method)at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)at java.net.Socket.connect(Socket.java:606)at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:156)at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:63)... 77 more
Exception in thread "main" MetaException(message:Error creating transactional connection factory)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:84)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.getProxy(RetryingHMSHandler.java:9                                            3)at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.jav                                            a:8661)at org.apache.hadoop.hive.metastore.HiveMetaStore.newRetryingHMSHandler(HiveMetaStore.jav                                            a: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.run(RunJar.java:323)at org.apache.hadoop.util.RunJar.main(RunJar.java:236)
Caused by: MetaException(message:Error creating transactional connection factory)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invokeInternal(RetryingHMSHandler.                                            java:208)at org.apache.hadoop.hive.metastore.RetryingHMSHandler.invoke(RetryingHMSHandler.java:108                                            )at org.apache.hadoop.hive.metastore.RetryingHMSHandler.<init>(RetryingHMSHandler.java:80)... 11 more
Caused by: javax.jdo.JDOFatalInternalException: Error creating transactional connection factory
NestedThrowables:
java.lang.reflect.InvocationTargetExceptionat org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDO                                            Helper.java:671)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenc                                            eManagerFactory.java:830)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(J                                            DOPersistenceManagerFactory.java:334)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOP                                            ersistenceManagerFactory.java:213)at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)at java.security.AccessController.doPrivileged(Native Method)at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:                                            1166)at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:701)at org.apache.hadoop.hive.metastore.ObjectStore.getPMF(ObjectStore.java:650)at org.apache.hadoop.hive.metastore.ObjectStore.getPersistenceManager(ObjectStore.java:69                                            3)at org.apache.hadoop.hive.metastore.ObjectStore.initializeHelper(ObjectStore.java:483)at org.apache.hadoop.hive.metastore.ObjectStore.initialize(ObjectStore.java:420)at org.apache.hadoop.hive.metastore.ObjectStore.setConf(ObjectStore.java:375)at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:79)at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:139)at org.apache.hadoop.hive.metastore.RawStoreProxy.<init>(RawStoreProxy.java:59)at org.apache.hadoop.hive.metastore.RawStoreProxy.getProxy(RawStoreProxy.java:67)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.newRawStoreForConf(HiveMetaS                                            tore.java:718)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMSForConf(HiveMetaStore.j                                            ava:696)at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getMS(HiveMetaStore.java:690                                            )at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStor                                            e.java:773)at org.apache.hadoop.hive.metastore.HiveMetaStore$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)... 13 more
Caused by: java.lang.reflect.InvocationTargetExceptionat sun.reflect.GeneratedConstructorAccessor74.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccesso                                            rImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPl                                            uginRegistry.java:606)at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:330)at org.datanucleus.store.AbstractStoreManager.registerConnectionFactory(AbstractStoreMana                                            ger.java:203)at org.datanucleus.store.AbstractStoreManager.<init>(AbstractStoreManager.java:162)at org.datanucleus.store.rdbms.RDBMSStoreManager.<init>(RDBMSStoreManager.java:285)at sun.reflect.GeneratedConstructorAccessor73.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccesso                                            rImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPl                                            uginRegistry.java:606)at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:301)at org.datanucleus.NucleusContextHelper.createStoreManagerForProperties(NucleusContextHel                                            per.java:133)at org.datanucleus.PersistenceNucleusContextImpl.initialise(PersistenceNucleusContextImpl                                            .java:422)at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenc                                            eManagerFactory.java:817)... 43 more
Caused by: org.datanucleus.exceptions.NucleusException: Attempt to invoke the "HikariCP" plugin t                                            o create a ConnectionPool gave an error : Failed to initialize pool: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactor                                            yImpl.java:232)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.initialiseDataSources(ConnectionFact                                            oryImpl.java:117)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.<init>(ConnectionFactoryImpl.java:82                                            )... 59 more
Caused by: com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize po                                            ol: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at com.zaxxer.hikari.pool.HikariPool.throwPoolInitializationException(HikariPool.java:544                                            )at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:536)at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:112)at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:72)at org.datanucleus.store.rdbms.connectionpool.HikariCPConnectionPoolFactory.createConnect                                            ionPool(HikariCPConnectionPoolFactory.java:176)at org.datanucleus.store.rdbms.ConnectionFactoryImpl.generateDataSources(ConnectionFactor                                            yImpl.java:213)... 61 more
Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapp                                            ing.java:64)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828)at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:448)at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241)at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:95)at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:101)at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:356)at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:199)at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:444)at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:515)... 65 more
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failureThe last packet sent successfully to the server was 0 milliseconds ago. The driver has not receiv                                            ed any packets from the server.at sun.reflect.GeneratedConstructorAccessor77.newInstance(Unknown Source)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccesso                                            rImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:423)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactor                                            y.java:167)at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:89)at com.mysql.cj.NativeSession.connect(NativeSession.java:119)at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:948)at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:818)... 74 more
Caused by: java.net.ConnectException: 拒绝连接 (Connection refused)at java.net.PlainSocketImpl.socketConnect(Native Method)at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:476)at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:218)at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:200)at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:394)at java.net.Socket.connect(Socket.java:606)at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:156)at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:63)... 77 more

怀疑是MySQL元数据出了问题：因为正常启动Metastore的时候是有进程的，但是一旦hiveserver2或者是Spark需要使用Metastore服务的时候，就会报错。

查看一下数据库的状态：

 mysqld.service - MySQL ServerLoaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)Active: failed (Result: exit-code) since 五 2023-08-25 10:48:01 CST; 18min agoDocs: man:mysqld(8)http://dev.mysql.com/doc/refman/en/using-systemd.htmlProcess: 1373 ExecStart=/usr/sbin/mysqld $MYSQLD_OPTS (code=exited, status=1/FAILURE)Process: 983 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)Main PID: 1373 (code=exited, status=1/FAILURE)Status: "Server startup in progress"Error: 17 (文件已存在)8月 25 10:47:56 datacollection systemd[1]: Starting MySQL Server...
8月 25 10:48:01 datacollection systemd[1]: mysqld.service: main process exited, code=exited, status=1/FAILURE
8月 25 10:48:01 datacollection systemd[1]: Failed to start MySQL Server.
8月 25 10:48:01 datacollection systemd[1]: Unit mysqld.service entered failed state.
8月 25 10:48:01 datacollection systemd[1]: mysqld.service failed.

根据提供的错误信息，MySQL 服务器无法启动，导致 Hive Metastore 连接数据库失败。

主要的提示信息如下：

8月 25 10:47:56 datacollection systemd[1]: Starting MySQL Server...
8月 25 10:48:01 datacollection systemd[1]: mysqld.service: main process exited, code=exited, status=1/FAILURE
8月 25 10:48:01 datacollection systemd[1]: Failed to start MySQL Server.
8月 25 10:48:01 datacollection systemd[1]: Unit mysqld.service entered failed state.
8月 25 10:48:01 datacollection systemd[1]: mysqld.service failed.

这表明 MySQL 服务器启动失败，并且进入了失败状态。可能的原因和解决方法包括：配置问题：检查你的 MySQL 配置文件是否正确，特别是与 Hive Metastore 连接相关的配置。确保配置项中的数据库连接URL、用户名和密码等是正确的。数据库文件权限问题：错误消息中提到 "文件已存在"，这可能意味着 MySQL 数据库文件的权限设置不正确。请确保数据库文件的所属用户和组正确，并且具有适当的权限。数据库服务未启动：请检查 MySQL 服务是否正在运行。你可以使用 systemctl status mysqld 命令来查看 MySQL 服务的当前状态。如果服务未运行，请尝试启动它：systemctl start mysqld
如果启动失败，请查看 MySQL 的错误日志文件以获取更多详细信息，并尝试解决错误。其他问题：MySQL 启动失败可能还有其他原因，如数据库损坏、资源不足或与其他进程的冲突。请检查 MySQL 的错误日志以获取更多信息，并根据具体情况尝试解决问题。请仔细检查以上建议，并尝试解决你的 MySQL 服务器启动问题。如果问题仍然存在，请考虑咨询你的系统管理员或 MySQL 社区支持以获取更多帮助

停止一下MySQL服务，再次查看状态：

重启一下MySQL的服务，再次查看状态：

可以看到这个时候MySQL状态正常

这个时候其他服务使用Metastore服务连接hive的时候就正常了