Ok I should have added that external address of the cluster is NATed to the internal address. The internal address yyy.yyy.yyy.yyy is not a routable address for the client. The client can reach the namenode on xxx.xxx.xxx.xxx but I guess the data node must advertise itself using the internal address (yyy.yyy.yyy.yyy). What is the way round this ( not an uncommon problem in secure environments).
Robin Sent from my iPad On 27 Jun 2013, at 03:41, Harsh J <[email protected]> wrote: > Clients will read/write data to the DNs directly. DNs serve on port 50010 and > 50020 by default. Please open up these ports, aside of the NN's RPC ports, to > be able to read/write data. > > > On Thu, Jun 27, 2013 at 2:23 AM, Robin East <[email protected]> wrote: >> I have a single node hadoop cluster setup behind a firewall and am trying to >> create files using a java program outside the firewall and get the exception >> below. The java program works fine inside the firewall. The ip address for >> the single cluster is xxx.xxx.xxx.xxx however it appears that in the >> createBlockOutputStream the client things the data node is at ip >> yyy.yyy.yyy.yyy (the internal address of the cluster) which is not >> accessible. >> The java code looks like this (using hadoop 1.1.2): >> >> private static void createHdfsFile() throws IOException { >> Configuration conf = new Configuration(); >> conf.set("fs.default.name", "hdfs://"+hdfsHost+":9000"); >> FileSystem hdfs = FileSystem.get(conf); >> System.out.println("HDFS Working Directory: " + >> hdfs.getWorkingDirectory().toString()); >> FSDataOutputStream os = hdfs.create(new >> Path("/user/hadoop/test2.txt")); >> >> os.writeChars("Example text\n for a hadoop write call\n\ntesting\n"); >> os.close(); >> } >> >> Any idea how I can get this to work? >> >> >> HDFS Working Directory: hdfs://xxx.xxx.xxx.xxx:9000/user/zzzzz >> Jun 26, 2013 8:08:52 PM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream >> createBlockOutputStream >> INFO: Exception in createBlockOutputStream yyy.yyy.yyy.yyy:50010 >> java.net.ConnectException: Connection timed out: no furth >> er information >> Jun 26, 2013 8:08:52 PM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream >> nextBlockOutputStream >> INFO: Abandoning block blk_4933973859208379842_1028 >> Jun 26, 2013 8:08:53 PM org.apache.hadoop.hdfs.DFSClient$DFSOutputStream >> nextBlockOutputStream >> INFO: Excluding datanode yyy.yyy.yyy.yyy:50010 >> Jun 26, 2013 8:08:53 PM >> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer run >> WARNING: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: >> java.io.IOException: File /user/hadoop/test2.txt >> could only be replicated to 0 nodes, instead of 1 >> at >> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:1558) >> at >> org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:696) >> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) >> at >> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) >> at >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) >> at java.lang.reflect.Method.invoke(Method.java:601) >> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:563) >> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1388) >> at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1384) >> at java.security.AccessController.doPrivileged(Native Method) >> at javax.security.auth.Subject.doAs(Subject.java:415) >> at >> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121) >> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1382) >> >> at org.apache.hadoop.ipc.Client.call(Client.java:1107) >> at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229) >> at $Proxy1.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:85) >> at >> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62) >> at $Proxy1.addBlock(Unknown Source) >> at >> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSClient.java:3686) >> at >> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFSClient.java:3546) >> at >> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.java:2749) >> at >> org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:2989) > > > > -- > Harsh J
