code: def up(job, input_file_id_1, input_file_id_2):
      
      with job.fileStore.writeGlobalFileStream() as (fileHandle, output_id):
          with job.fileStore.readGlobalFileStream(input_file_id_1) as inputFileHandle1:
              with job.fileStore.readGlobalFileStream(input_file_id_2) as inputFileHandle2:
                  job.fileStore.logToMaster("Merging %s and %s to %s"
                                            % (input_file_id_1, input_file_id_2, output_id))
                  merge(inputFileHandle1, inputFileHandle2, fileHandle)
  
          # Cleanup up the input files - these deletes will occur after the completion is successful.
          job.fileStore.deleteGlobalFile(input_file_id_1)
          job.fileStore.deleteGlobalFile(input_file_id_2)
          return output_id
docs: Merges the two files and places them in the output.