第一次启动hive报如下错误：Exception in thread “main” java.lang.RuntimeException: java.net.ConnectException: Call From bdc112/192.168.10.112 to bdc112:8020 failed on connection exception: java.net.ConnectException: 拒绝连接; For more details see: http://wiki.apache.org/hadoop/ConnectionRefused

详细报错如下

Exception in thread "main" java.lang.RuntimeException: java.net.ConnectException: Call From bdc112/192.168.10.112 to bdc112:8020 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.java:651)
	at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.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(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:318)
	at org.apache.hadoop.util.RunJar.main(RunJar.java:232)
Caused by: java.net.ConnectException: Call From bdc112/192.168.10.112 to bdc112:8020 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 Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.apache.hadoop.net.NetUtils.wrapWithMessage(NetUtils.java:831)
	at org.apache.hadoop.net.NetUtils.wrapException(NetUtils.java:755)
	at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1549)
	at org.apache.hadoop.ipc.Client.call(Client.java:1491)
	at org.apache.hadoop.ipc.Client.call(Client.java:1388)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:233)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:118)
	at com.sun.proxy.$Proxy28.getFileInfo(Unknown Source)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:904)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422)
	at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
	at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
	at org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
	at com.sun.proxy.$Proxy29.getFileInfo(Unknown Source)
	at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1661)
	at org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1577)
	at org.apache.hadoop.hdfs.DistributedFileSystem$29.doCall(DistributedFileSystem.java:1574)
	at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
	at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1589)
	at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1683)
	at org.apache.hadoop.hive.ql.exec.Utilities.ensurePathIsWritable(Utilities.java:4486)
	at org.apache.hadoop.hive.ql.session.SessionState.createRootHDFSDir(SessionState.java:760)
	at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java:701)
	at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:627)
	... 9 more
Caused by: java.net.ConnectException: 拒绝连接
	at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
	at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
	at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
	at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531)
	at org.apache.hadoop.ipc.Client$Connection.setupConnection(Client.java:700)
	at org.apache.hadoop.ipc.Client$Connection.setupIOstreams(Client.java:804)
	at org.apache.hadoop.ipc.Client$Connection.access$3800(Client.java:421)
	at org.apache.hadoop.ipc.Client.getConnection(Client.java:1606)
	at org.apache.hadoop.ipc.Client.call(Client.java:1435)
	... 34 more

报错截图如下：

其实原因很简单，由上图的报错可知（标有红框框），意思不能连接到我们的hadoop集群，检查自己的hadoop集群是否启动成功或启动完整。

启动hadoop后的集群和我这个差不多就可以了，即4-3-3.

[lqs@bdc112 hive]$ bin/hive

再次启动

出现如上图的内容，则启动成功！