Yes, just restart the TaskTracker. There's no need to restart your JobTracker, so a rolling TT reconfigure+restart should get you going.
P.s. general@ is for project wide general discussions, not user specific queries, which should go to mapreduce-user@ instead. Moving it there, with you as a recipient. (Bcc'd general@) On Sun, Aug 14, 2011 at 4:06 AM, Xiangping Bu <xiangpin...@gmail.com> wrote: > Hi, All > > Is that possible to reconfigure the number of map/red slots per > machine without restarting the Hadoop cluster? > > Thanks > > Xiangping > -- Harsh J