On querying the Wikimedia API with revision ID which has a large diff, results in an error.
Example of truncated output: https://en.wikipedia.org/w/api.php?action=query&prop=revisions&revids=797460682&rvdiffto=prev&rvprop=ids|user|userid|tags|comment
Expected Output (WARNING: it is a large diff): https://en.wikipedia.org/w/index.php?diff=prev&oldid=797460682
| Subject | Repo | Branch | Lines +/- | |
|---|---|---|---|---|
| API: Don't apply size limit to action=compare | mediawiki/core | master | +4 -1 |
The diff in question is 13,318,678 bytes. Being able to return this would require raising the value of $wgAPIMaxResultSize. Whether that should actually be done, I don't know. It turns out to be easy to generate a diff that's 297,795,697 bytes, BTW.
I note that trying to view https://en.wikipedia.org/w/index.php?diff=prev&oldid=797460682 in my browser doesn't work very well, as it's such a huge table.
Since the diffing ability for prop=revisions is already deprecated (see T164106), let's not worry about that. For action=compare, since that returns only the diff without a bunch of extraneous data we can probably just bypass the size limitation. But trying to generate that 300 megabyte diff may well hit PHP's memory limit even before it gets to the API.
Change 402834 had a related patch set uploaded (by Anomie; owner: Anomie):
[mediawiki/core@master] API: Don't apply size limit to action=compare
Change 402834 merged by jenkins-bot:
[mediawiki/core@master] API: Don't apply size limit to action=compare
This should be deployed to WMF sites with 1.31.0-wmf.17 or later. See https://www.mediawiki.org/wiki/MediaWiki_1.31/Roadmap for the schedule.
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