It will start from scratch to copy all map outputs from all mapper nodes; Regards, *Stanley Shi,*
On Thu, Jul 3, 2014 at 2:28 PM, James Teng <tenglinx...@outlook.com> wrote: > First i would like to declare that although i am not new to hadoop, but > not expert on it as well. > i would like to consult one issue on mapreduce framework. below is the > description of the scenarios. > > When one reduce task is failed on one datanode, then the job tracker will > try to schedule another node to set up this reduce job and continue > running, my question is how to get the assigned data back on the new node? > when the map phase is done, the output data will be copied to the > respective partitioned reducer, now if the reduce is created on the a new > node, what kind of actions does the new node take to get all the > map-allocated data back. > > > thanks in advance. > > James. >
