- hive在启动的时出现以上错误，是因为在启动hive之前没有先启动namenode，因为hive的运行是基于Hadoop集群，因此打开Hadoop问题解决！
on: Call From hadoop101/192.168.2.101 to hadoop101:9820 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused)
Exception in thread "main" java.lang.RuntimeException: java.net.ConnectExcepti on: Call From hadoop101/192.168.2.101 to hadoop101:9820 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.j ava:651) at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionSt ate.java:591) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:747) at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:683) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImp l.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcc essorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.util.RunJar.run(RunJar.java:221) at org.apache.hadoop.util.RunJar.main(RunJar.java:136) Caused by: java.net.ConnectException: Call From hadoop101/192.168.2.101 to had oop101:9820 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Metho d) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstru ctorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Delegatin gConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:792) at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:732) at org.apache.hadoop.ipc.Client.call(Client.java:1479) at org.apache.hadoop.ipc.Client.call(Client.java:1412) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcE ngine.java:229) at com.sun.proxy.$Proxy28.getFileInfo(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorP B.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:771) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImp l.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcc essorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(Retr yInvocationHandler.java:191) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvoc ationHandler.java:102) at com.sun.proxy.$Proxy29.getFileInfo(Unknown Source) at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:2108) at org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedF ileSystem.java:1305) at org.apache.hadoop.hdfs.DistributedFileSystem$22.doCall(DistributedF ileSystem.java:1301) at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkR esolver.java:81) at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(Distribu tedFileSystem.java:1301) at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1424) at org.apache.hadoop.hive.ql.exec.Utilities.ensurePathIsWritable(Utili ties.java:4486) at org.apache.hadoop.hive.ql.session.SessionState.createRootHDFSDir(Se ssionState.java:760) at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(Se ssionState.java:701) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.j ava:627) ... 9 more Caused by: java.net.ConnectException: 拒绝连接 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:7 17) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeo ut.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:495) at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java :614) at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java: 712) at org.apache.hadoop.ipc.Client$Connection.access$2900(Client.java:375 ) at org.apache.hadoop.ipc.Client.getConnection(Client.java:1528) at org.apache.hadoop.ipc.Client.call(Client.java:1451) ... 30 morehive在启动的时出现以上错误，是因为在启动hive之前没有先启动namenode，因为hive的运行是基于Hadoop集群，因此打开Hadoop问题解决！
