Thanks Matthew. I just realized in searching a bit more that the variable has to be set in the mapred-site.xml configuration file with hadoop 0.20.203, otherwise it doesn't affect anything. I was setting it in the command line. I've already been setting the number of workers the way you suggested. I'll give it a try.
Best, Matthew On Thu, Oct 30, 2014 at 12:36 PM, Matthew Cornell <[email protected]> wrote: > As I understand it, 1) set the variable to 1 as you say, and 2) > specify the number of workers to the number of nodes - 1 (for the > master). When you run a job you can look at the 'map' link on the > tasktracker ui to see all the workers plus master. > > On Thu, Oct 30, 2014 at 7:11 AM, Matthew Saltz <[email protected]> wrote: > > Hi everyone, > > > > Is there a good way (a configuration I'm guessing) to prevent more than > one > > worker from running per node? I saw in this thread to use > > mapred.tasktracker.map.tasks.maximum=1, but that doesn't seem to be > working. > > Thanks for the help. > > > > Best, > > Matthew > > > > > > -- > Matthew Cornell | [email protected] | 413-626-3621 | 34 > Dickinson Street, Amherst MA 01002 | matthewcornell.org >
