Are you asking who assigns the task to HostB or who makes sure a task assigned
to HostB reads from HostB's local copy?
The first is the job tracker. The second is the DFSClient used by the task.
-Joey
On Mar 7, 2012, at 7:57, Pedro Costa <psdc1...@gmail.com> wrote:
> Hi,
>
> In MapReduce, if the locations of the split are in {HostA, HostB, HostC}, and
> the respective map tasks will run in HostB, the map tasks will pick up the
> split from HostB?
>
> Who is responsible to make the map tasks get the spilt in HostB? Is the
> JobTracker or the MapTask?
>
> --
> Best regards,
>
