=  Client data model =

This document describes proposed changes to the client
so that it can handle distributed storage.

== Current ==

FILE_INFO elements

 * generated_locally
 * upload_when_present
 * uploaded
 * sticky
 * urls

status (present, not present, error)

== Problems ==

== Proposed ==

FILE_INFO elements:

 * upload_urls
 * download_urls
 * status

<file_info> elements in scheduler replies:

 * if referenced from an app version or workunit,
   set download_if_not_present

 * if referenced from a result,
   and no_upload is not present,
   set upload_when_present.

If we get an upuload request and the file isn't there, return error

Edge case:
an input file that may have been generated by a previous job.
If not, this job should generate it.
Include such a file as an output, not an input.
Input files have the property that if they're not present,
we download them.