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.InvocationTargetException

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 failure

Caused by: com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Failed to initialize po                                            ol: Communications link failure

Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

Caused 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.InvocationTargetException
        at 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.InvocationTargetException
        at 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 failure

The 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 failure

The 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 failure

The 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 failure

The 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.InvocationTargetException
        at 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.InvocationTargetException
        at 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 failure

The 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 failure

The 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 failure

The 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 failure

The 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 Server
   Loaded: 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 ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 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