Java – Access Hadoop from a remote machine

I

set up hadoop (pseudo-distributed) on the server VM and I’m trying
Use the Java API to access HDFS.

The

fs.default.name on my server is hdfs://0.0.0.0:9000 (like localhost:9000, it won’t accept requests from remote websites).

I can connect to a server on port 9000

$ telnet srv-lab 9000
Trying 1*0.*.30.95...
Connected to srv-lab
Escape character is '^]'.
^C

This indicates to me that the connection should work. The Java code I use is:

try {
        Path pt = new Path(
                "hdfs://srv-lab:9000/test.txt");
        Configuration conf = new Configuration();
        conf.set("fs.default.name", "hdfs://srv-lab:9000");
        FileSystem fs = FileSystem.get(conf);
        BufferedReader br = new BufferedReader(new InputStreamReader(
                fs.open(pt)));
        String line;
        line = br.readLine();
        while (line != null) {
            System.out.println(line);
            line = br.readLine();
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

But what I get is:

java.net.ConnectException: Call From clt-lab/1*0.*.2*2.205 to srv-lab:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused

So any hint as to why the connection is rejected even though the connection works fine via telnet?

Your HDFS entry is incorrect. fs.default.name must be set to hdfs://srv-lab:9000. Set it up and restart your cluster. This will solve the problem