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From John Lilley <john.lil...@redpoint.net>
Subject RE: Exception in createBlockOutputStream - poss firewall issue
Date Tue, 02 Jul 2013 18:48:51 GMT
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.

From: Robin East [mailto:robin.east@xense.co.uk]
Sent: Thursday, June 27, 2013 12:18 AM
To: user@hadoop.apache.org
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).


Sent from my iPad

On 27 Jun 2013, at 03:41, Harsh J <harsh@cloudera.com<mailto:harsh@cloudera.com>>
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 <robin.east@xense.co.uk<mailto:robin.east@xense.co.uk>>
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<http://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");

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
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