On Jun 21, 2011, at 9:52 AM, Jonathan Zukerman wrote: > Hi, > > Is there a way to set the maximum map tasks for all tasktrackers in my > cluster for a certain job? > Most of my tasktrackers are configured to handle 4 maps concurrently, and > most of my jobs don't care where does the map function run. But small part > of my jobs requires that no two map functions will run from the same IP at > the same time, i.e., the maximum number of map tasks for each tasktracker > should be 1 for these jobs.
http://wiki.apache.org/hadoop/FAQ#How_do_I_limit_.28or_increase.29_the_number_of_concurrent_tasks_a_job_may_have_running_total_at_a_time.3F
