Hi John, exactly what I was thinking, however I haven't found a way to do that. If I ever have time I'll trawl through the code, however I've managed to avoid the issue by placing both machines inside the firewall.
Regards Robin Sent from my iPhone On 2 Jul 2013, at 19:48, John Lilley <[email protected]> wrote: > I don’t know the answer… but if it is possible to make the DNs report a > domain-name instead of an IP quad it may help. > John > > > From: Robin East [mailto:[email protected]] > Sent: Thursday, June 27, 2013 12:18 AM > To: [email protected] > Subject: Re: Exception in createBlockOutputStream - poss firewall issue > > 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
