Thanks Allen. On Sat, Mar 12, 2011 at 11:34 AM, Allen Wittenauer <[email protected]> wrote:
> > (Removing common-dev, because this isn't really a dev question) > > On Feb 25, 2011, at 5:52 AM, bikash sharma wrote: > > > Hi, > > How is task slot in Hadoop defined with respect to scheduling a > map/reduce > > task on such slots available on TaskTrackers? > > > On a TaskTracker, one sets how many maps and reduces one wants to > run on that node. The JobTracker is informed of this value. When a job is > getting scheduled, it compares the various tasks's input to see if a > DataNode is providing a matching block. If a block exists or is nearby, the > task is scheduled on that node. > > >
