On Tue, Apr 27, 2010 at 12:43 AM, Harold Lim <[email protected]> wrote: > Hi All, > > I was looking at the jobtracker metrics and it seems to be able to give me: > jobs_completed, jobs_submitted, maps_completed, maps_launched, > reduces_completed, reduces_launched. > > I was wondering what maps launched mean? Is this only the number of maps > assigned to the task trackers?
maps_launched and reduces_launched are metrics that are incremented every time a map / reduce task is picked by the scheduler to be launched on a TaskTracker. > > I was wondering if it's possible to get the total number of maps that will be > generated for a corresponding job? I am not entirely sure of this, but can you try to see if JobClient.getMapTaskReports(jobid).length works ? There are equivalent APIs in the newer Job class as well. Thanks Hemanth
