https://bugzilla.wikimedia.org/show_bug.cgi?id=55754

       Web browser: ---
            Bug ID: 55754
           Summary: list=allcampaigns API can run slowly or timeout if
                    data not cached
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
               URL: commons.wikimedia.org/w/api.php?action=query&list=allc
                    ampaigns&uclimit=500
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: UploadWizard
          Assignee: yuvipa...@gmail.com
          Reporter: br...@wikimedia.org
                CC: bawolff...@gmail.com, fflo...@wikimedia.org,
                    mtrac...@member.fsf.org, nischay...@gmail.com
    Classification: Unclassified
   Mobile Platform: ---

Currently the upload campaigns branch of the Android Commons app uses
UploadWizard's list=allcampaigns API to periodically refresh the list of
campaigns.

Unfortunately this can run really slowly on Commons, especially if the parsed
titles/descriptions/etc aren't cached due to a software update, massive cache
clear, or selection of a new language. The worst case is a timeout or outright
HTTP 500 error.

A few possibilities:

* (probably easy) could aggressively limit the number of items returned when
not cached, so you at least get a fast result with fewer items instead of a
timeout. This allows clients to continue fetching to get the rest of the
results as they are built.

* (a bit more work) could do more lightweight rendering -- at fetch time we
really only need the title; we could fetch the description and other fields
when we go to upload something. Separately caching/rendering 'just titles' and
'whole field sets' could allow the list to run *much* faster.

* (probably not feasible?) could pre-cache items in the JobQueue after their
dependencies change?

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