Does Hadoop support running simultaneous jobs? If so, what parameters do I need to set in my job configuration? We basically want to give a job that takes a really long time, half of the total resources of the cluster so other jobs don't queue up behind it.
I am using Hadoop 0.14.2 currently. I tried setting mapred.tasktracker.tasks.maximum to be half of the maximum specified in mapred-default.xml. This shows the change in the web administration page for the job, but it has no effect on the actual numbers of tasks running. Thanks, Xavier
