JAVA客户端连接部署在docker上的hdfs

Question

docker上已经成功部署了hdfs应用，jps命令也显示了namenode和datanode启动正常。浏览器显示 宿主机ip：50070 页面
我在eclipse使用java连接hdfs，代码如下：

    FileSystem hdfs;
    Configuration conf = new Configuration();
    try {
    hdfs = FileSystem.get(new URI("hdfs://10.8.2.11:9999"),conf);
    Path des =new Path("E:/AB4/hdfs/worksapce");  
    String srcPath = "/abcloud";
    Path src = new Path(srcPath);
    hdfs.copyFromLocalFile(false,true,des, src);

运行结果：

    org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /abcloud/test.txt could only be replicated to 0 nodes instead of minReplication (=1).  There are 1 datanode(s) running and 1 node(s) are excluded in this operation.
at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1559)
at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3245)
at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:663)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:482)
at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:619)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:975)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2040)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2036)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1692)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2034)

at org.apache.hadoop.ipc.Client.call(Client.java:1411)
at org.apache.hadoop.ipc.Client.call(Client.java:1364)
at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:206)
at com.sun.proxy.$Proxy7.addBlock(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
at com.sun.proxy.$Proxy7.addBlock(Unknown Source)
at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:368)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1449)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1270)
at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:526)

---

有没有大神曾在docker上成功部署hdfs,并在可以使用java api操作的，分享下经验

补充：我使用eclipse-hadoop插件连接后，文件系统里有那个文件，但是没有内容

Answer 1

http://www.louisvv.com/archiv...
需要建立宿主机和datanode节点之间的通信，否则客户端是无法访问datanode节点的。
只映射namenode节点是不行的，每个节点的hdfs端口和http端口都需要映射出来。

Answer 2

你好，我也是遇到一样的问题。在docker中master命令后上传没问题，将9000端口映射出来到宿主机9000后，访问hdfs://localhost:9000使用java api上传，出现跟你一样的问题。文件是上传上去了，但是大小是0.eclipse报错跟你的一样。请问你的问题解决了吗？搞了好久没解决

Answer 3

遇到了同样的问题。。。 求解啊