Preferred way to submit a job?

[David Rosenstrauch]

What's the preferred way to submit a job these days? 
org.apache.hadoop.mapreduce.Job.submit() ?  Or 
org.apache.hadoop.mapred.JobClient.runJob()?  Or does it even matter? 
(i.e., is there any difference between them?)

I've been trying to run a job using 
org.apache.hadoop.mapreduce.Job.submit() (since I assumed that the 
org.apache.hadoop.mapred.* classes were deprecated).  However, I'm 
seeing some weirdness (the "mapred.job.tracker" setting that I set on my 
job's Configuration is getting ignored, and making the job get run 
locally) and I was wondering if the way I was submitting my job might 
have something to do with it.


On a related note, if there's actually no difference between the 2 
methods, would anybody have any idea what could make the 
"mapred.job.tracker" setting on a job Configuration get ignored?  (I 
currently have it set to "hdfs://<hadoop_job_tracker_host_name>:9001".)

TIA,

DR