https://bugzilla.wikimedia.org/show_bug.cgi?id=1935
Ashar Voultoiz <has...@free.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |has...@free.fr
Resolution| |WORKSFORME
--- Comment #2 from Ashar Voultoiz <has...@free.fr> 2011-01-20 20:11:37 UTC ---
Quoting Roan in
http://permalink.gmane.org/gmane.science.linguistics.wikipedia.technical/51583
'''
Wikimedia doesn't technically use delta compression. It concatenates a
couple dozen adjacent revisions of the same page and compresses that
(with gzip?), achieving very good compression ratios because there is
a huge amount of duplication in, say, 20 adjacent revisions of
[[Barack Obama]] (small changes to a large page, probably a few
identical versions to due vandalism reverts, etc.). However,
decompressing it just gets you the raw text, so nothing in this
storage system helps generation of diffs. Diff generation is still
done by shelling out to wikidiff2 (a custom C++ diff implementation
that generates diffs with HTML markup like <ins>/<del>) and caching
the result in memcached.
'''
Seems good enough. Closing bug as works for me.
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