Hi Matt, it might be that the parameter does not end up in the final configuration for a number of reasons. Can you check the job config xml in jt:/var/log/hadoop/history or in the JT UI and see what the mapred.reduce.tasks setting is? -- Alex K
On Thu, Oct 21, 2010 at 1:39 PM, Matt Tanquary <matt.tanqu...@gmail.com>wrote: > I am using the following to set my number of reduce tasks, however when I > run my job it's always using just 1 reducer. > > conf.setInt("mapred.reduce.tasks", 20); > > 1 reducer will never finish this job. Please help me to understand why the > setting I choose is not used. > > Thanks, > -M@ >