Hello All, I have recently switched my small Hadoop dev cluster (v0.20.1) to use the FairScheduler. I have a max of 128 map tasks available and recently noticed that my jobs seem to use a maximum of 16 at any given time (the job I am looking at in particular runs for about 15 minutes) - they are also all data local map tasks. I searched around a bit and discovered the mapred.fairscheduler.locality.delay may be to blame. I set it to 0 in mapred-site.xml, copied the file around to my nodes and tried running another job. It still has 16 tasks.
Does it require a cluster restart? Is it something totally different? Should I not set this value to zero? Thanks! -- Adam
