Hi, You can change the no of slots using the following properties in mapred-site.xml.
1. mapred.tasktracker.map.tasks.maximum ( for map slots) 2. mapred.tasktracker.reduce.tasks.maximum (for reduce slot) On Tue, Jun 5, 2012 at 3:44 AM, Keith Wiley <kwi...@keithwiley.com> wrote: > The number of slots corresponds to the number of cores (e.g., a 10-node > cluster consisting of quad-core cpus has 40 cores and therefore 40 slots). > The slots can be divided amongst the maps and reduces in a way which > integer-divides into the cores of a single machine. So if the nodes are > quad-cores you can do 3:1, 2:2, or 1:3. If the nodes are dual-quad-cores > (each node has eight cores) you can do 7:1 through 1:7 in any configuration > you want..........as per my understanding. Others may pipe in to clarify > some minor point I have missed, I'm unsure. > > On Jun 4, 2012, at 09:06 , kartheek muthyala wrote: > > > Hello all, > > > > Can I increase the number of map slots in a machine using some > > configuration?. I can find configurations for increasing the number of > > maps and reduce tasks that can run, but didn't find anything related > > to slots. Is that default decided based on the memory size? > > > > Thanks, > > Kartheek. > > > > ________________________________________________________________________________ > Keith Wiley kwi...@keithwiley.com keithwiley.com > music.keithwiley.com > > "I do not feel obliged to believe that the same God who has endowed us with > sense, reason, and intellect has intended us to forgo their use." > -- Galileo Galilei > > ________________________________________________________________________________ > > -- https://github.com/zinnia-phatak-dev/Nectar
