Hi, this is a strange problem so please bear with me, I submitted about 290 jobs on my queue on a 6 machine cluster (15 map slots, 15 reduce slots) , and everything was fine and dandy for first 15 hours, I noticed that some jobs started reduce tasks even before single map had been executed, so out of 15 reduce slots, 12 were taken up by one inactive job, with status as reduce -> copy, but no progress, so one active job had only 3 slots to run with, and that slowed up overall execution,
please fell free to tell me if that was incoherent, but is there a way you can tell queue to not execute reduce before map is done, I've speculative execution flag as FALSE. thanks, -dp
