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From: Robin East <robin.east@xense.co.uk>
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Subject: Exception in createBlockOutputStream - poss firewall issue
Message-Id: <025DE510-39DF-4562-8F93-4E0ED7D77FFF@xense.co.uk>
Date: Wed, 26 Jun 2013 21:53:45 +0100
To: user@hadoop.apache.org
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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.=20
The java code looks like this (using hadoop 1.1.2):

    private static void createHdfsFile() throws IOException {
        Configuration conf =3D new Configuration();
        conf.set("fs.default.name", "hdfs://"+hdfsHost+":9000");
        FileSystem hdfs =3D FileSystem.get(conf);
        System.out.println("HDFS Working Directory: " + =
hdfs.getWorkingDirectory().toString());
        FSDataOutputStream os =3D hdfs.create(new =
Path("/user/hadoop/test2.txt"));
       =20
        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$DataStreamer run
WARNING: DataStreamer Exception: org.apache.hadoop.ipc.RemoteException: =
java.io.IOException: File /user/hadoop/test2.txt
 could only be replicated to 0 nodes, instead of 1
        at =
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSN=
amesystem.java:1558)
        at =
org.apache.hadoop.hdfs.server.namenode.NameNode.addBlock(NameNode.java:696=
)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at =
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:=
57)
        at =
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorIm=
pl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.apache.hadoop.ipc.RPC$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(RetryInvoca=
tionHandler.java:85)
        at =
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHa=
ndler.java:62)
        at $Proxy1.addBlock(Unknown Source)
        at =
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.locateFollowingBlock(DFSC=
lient.java:3686)
        at =
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.nextBlockOutputStream(DFS=
Client.java:3546)
        at =
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.access$2600(DFSClient.jav=
a:2749)
        at =
org.apache.hadoop.hdfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClien=
t.java:2989)