Set hadoop system user for client embedded in Java webapp

Question

I would like to submit MapReduce jobs from a java web application to a remote Hadoop cluster but am unable to specify which user the job should be submitted for. I would lik

Answer 1

The code below works for me the same as

System.setProperty("HADOOP_USER_NAME", "hduser")

UserGroupInformation ugi = UserGroupInformation.createRemoteUser("hduser"); 
ugi.doAs(new PrivilegedExceptionAction() {
    public Void run() throws Exception {
        Configuration configuration = new Configuration(); 
        configuration.set("hadoop.job.ugi", "hduser");
        int res = ToolRunner.run(configuration, new YourTool(), args);
        return null; 
    }
});