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Hi i am getting the following errors while starting the ambari server ... How can i fix this ??

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java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at com.mysql.cj.protocol.StandardSocketFactory.connect(StandardSocketFactory.java:173) at com.mysql.cj.protocol.a.NativeSocketConnection.connect(NativeSocketConnection.java:65) ... 15 more

13 REPLIES 13

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Master Mentor

@Arjun Das

What is the output of the command

$ sudo hostname 

Check the hostname

$ sudo nano /etc/hostname 

Edit hostname sudo nano /etc/hosts

Make sure your hostname maps to the ip like

127.0.1.1     hostname     alias 

If you have made changes in the previous steps then restart the server

$ sudo shutdown -r now

And again as reiterated by jay zipped the ambari log and share

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@Jay Kumar SenSharma

grep 'jdbc' /etc/ambari-server/conf/ambari.properties custom.mysql.jdbc.name=mysql-connector-java-5.1.47.jar server.jdbc.connection-pool=c3p0 server.jdbc.connection-pool.acquisition-size=5 server.jdbc.connection-pool.idle-test-interval=7200 server.jdbc.connection-pool.max-age=0 server.jdbc.connection-pool.max-idle-time=14400 server.jdbc.connection-pool.max-idle-time-excess=0 server.jdbc.database=mysql server.jdbc.database_name=amabari_data server.jdbc.driver=com.mysql.jdbc.Driver server.jdbc.driver.path=/usr/lib/java/mysql-connector-java-5.1.47.jar server.jdbc.hostname=N9722 server.jdbc.port=3306 server.jdbc.rca.driver=com.mysql.jdbc.Driver server.jdbc.rca.url=jdbc:mysql://N9722:3306/amabari_data server.jdbc.rca.user.name=root server.jdbc.rca.user.passwd=/etc/ambari-server/conf/password.dat server.jdbc.url=jdbc:mysql://N9722:3306/amabari_data server.jdbc.user.name=root server.jdbc.user.passwd=/etc/ambari-server/conf/password.dat

AmbariLdapConfigurationProvider:126 - JPA initialized event received: JpaInitializedEvent{eventType=JPA_INITIALIZED} 2018-08-28 10:55:38,090 INFO [pool-4-thread-1] AmbariLdapConfigurationProvider:90 - Loading LDAP configuration ... 2018-08-28 10:55:38,090 INFO [pool-4-thread-1] AmbariLdapConfigurationProvider:92 - Actually loading LDAP configuration from DB ... 2018-08-28 10:55:38,187 INFO [main] AbstractPoolBackedDataSource:212 - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 5, acquireRetryAttempts -> 30, acquireRetr yDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mch ange.v2.c3p0.impl.DefaultConnectionTester, contextClassLoaderSource -> caller, dataSourceName -> z8kfsx9xz8id6b1rajz85|6b695b06, debugUnreturnedConnectionStackTraces -> false, description -> null, driverC lass -> com.mysql.jdbc.Driver, extensions -> {}, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, forceSynchronousCheckins -> false, forceUseNamedDriverClass -> false, identityToken -> z8kfsx9xz8id6b1rajz85|6b695b06, idleConnectionTestPeriod -> 7200, initialPoolSize -> 5, jdbcUrl -> jdbc:mysql://N9722:3306/amabari_data, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 14400, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 32, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 5, numHelperThreads -> 3, preferredTestQuery -> SELECT 1, privilegeSpawnedThreads -> false, properties -> {user=******, password=******}, propertyCycle -> 0, statementCacheNumDeferredCloseThreads -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, userOverrides -> {}, usesTraditionalReflectiveProxies -> false ] 2018-08-28 10:56:08,395 WARN [C3P0PooledConnectionPoolManager[identityToken->z8kfsx9xz8id6b1rajz85|6b695b06]-HelperThread-#2] BasicResourcePool:223 - com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@26fccf15 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.GeneratedConstructorAccessor50.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:342) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2197) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2230) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2025) at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:778) at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) at sun.reflect.GeneratedConstructorAccessor49.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125) at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) Caused by: java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:589) at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:301)

2018-08-28 10:56:08,395 WARN [C3P0PooledConnectionPoolManager[identityToken->z8kfsx9xz8id6b1rajz85|6b695b06]-HelperThread-#0] BasicResourcePool:223 - com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask@44b69099 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.GeneratedConstructorAccessor50.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990) at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:342) at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2197) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2230) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2025) at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:778) at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47) at sun.reflect.GeneratedConstructorAccessor49.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386) at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:330) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1138) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquireAndDecrementPendingAcquiresWithinLockOnSuccess(BasicResourcePool.java:1125) at com.mchange.v2.resourcepool.BasicResourcePool.access$700(BasicResourcePool.java:44) at com.mchange.v2.resourcepool.BasicResourcePool$ScatteredAcquireTask.run(BasicResourcePool.java:1870) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:696) Caused by: java.net.ConnectException: Connection refused (Connection refused) at java.net.PlainSocketImpl.socketConnect(Native Method)

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i have change the hostname too... please let me know where am i doing it wrong

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New Contributor

Check if /etc/hosts has private ips correctly entered in all hosts. It was causing issue in my case.