module Mapred_taskfiles:Copy files to and from the task nodessig..end
class type taskfile_manager =object..end
val scp_taskfile_manager : Mapred_config.mapred_config ->
Mapred_def.mapred_job_config -> taskfile_managerscp to copy file to remote nodes.
The local_directory is set to mr_task_tmpdir/job_id_"local".
The log_directory is set to mr_task_tmpdir/job_id_"log".