自己安装好Hadoop2.7.x之后,发现dfs中的/bin/hadoop fs -put命令不能够使用,报错如下:
[hadoop@master bin]$ ./hadoop fs -put ../logs/123 /wc/mytemp
16/07/27 01:29:26 INFO hdfs.DFSClient: Exception in createBlockOutputStreamjava.net.NoRouteToHostException: No route to host 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.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1537) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1313) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1266) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449)16/07/27 01:29:26 INFO hdfs.DFSClient: Abandoning BP-555863411-172.16.95.100-1469590594354:blk_1073741825_100116/07/27 01:29:26 INFO hdfs.DFSClient: Excluding datanode DatanodeInfoWithStorage[172.16.95.101:50010,DS-ee00e1f8-5143-4f06-9ef8-b0f862fce649,DISK]16/07/27 01:29:26 INFO hdfs.DFSClient: Exception in createBlockOutputStreamjava.net.NoRouteToHostException: No route to host at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:531) at org.apache.hadoop.hdfs.DFSOutputStream.createSocketForPipeline(DFSOutputStream.java:1537) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.createBlockOutputStream(DFSOutputStream.java:1313) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1266) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449)16/07/27 01:29:26 INFO hdfs.DFSClient: Abandoning BP-555863411-172.16.95.100-1469590594354:blk_1073741826_100216/07/27 01:29:26 INFO hdfs.DFSClient: Excluding datanode DatanodeInfoWithStorage[172.16.95.102:50010,DS-eea51eda-0a07-4583-9eee-acd7fc645859,DISK]16/07/27 01:29:26 WARN hdfs.DFSClient: DataStreamer Exceptionorg.apache.hadoop.ipc.RemoteException(java.io.IOException): File /wc/mytemp/123._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 2 datanode(s) running and 2 node(s) are excluded in this operation. at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1547) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getNewBlockTargets(FSNamesystem.java:3107) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3031) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:724) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:492) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:969) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2049) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2045) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:422) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2043) at org.apache.hadoop.ipc.Client.call(Client.java:1475) at org.apache.hadoop.ipc.Client.call(Client.java:1412) at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:229) at com.sun.proxy.$Proxy9.addBlock(Unknown Source) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:418) 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:497) at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191) at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102) at com.sun.proxy.$Proxy10.addBlock(Unknown Source) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1459) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1255) at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:449)put: File /wc/mytemp/123._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). There are 2 datanode(s) running and 2 node(s) are excluded in this operation.[hadoop@master bin]$ service firewallThe service command supports only basic LSB actions (start, stop, restart, try-restart, reload, force-reload, status). For other actions, please try to use systemctl.到网上找资料,好不统一找到几个解决的办法,感觉值的参考的是该文:,在其第14条,他给出的解决办法如下:
I have resolved the issue:
What i did: 1) '/etc/init.d/iptables stop' -->stopped firewall 2) SELINUX=disabled in '/etc/selinux/config' file.-->disabled selinux I worked for me after these two changes需要补充的地方:
(1)此处CentOS7中,防火墙的方式改变,关闭防火墙改成service firewalld stop
(2)不仅是master中的firewall要关闭,所有的从节点(slave)中的防火墙也要关闭。
(3)检查所有的主机,/etc/selinux/config下的SELINUX,设置SELINUX=disable。
(4)建议关闭防火墙之后,再使用systemctl disable firewalld.service #禁止firewall开机启动
然后在进行put的时候,就成功了。截图如下:
另外一个人博主给出的解决方法如下:, 大家可以尝试一下,可以这样说,新手一般都会挂掉,因为格式化namenode的时候,slave中的文件会和namenode不一致,造成DataNode节点启动失败,解决办法就是删除slave和master中所有的data节点,然后重新执行namenode格式化操作。(不只是自己水平有限还是问题不一样,这种方法初步判定为坑人)