The deltas library implements the rough WikiWho strategy in a difflib sort of way as "SegmentMatcher".

Re. diffs, I have some datasets that I have generated and can share.  Would enwiki-20150602 be recent enough for your uses?

If not, then I'd also like to point you to http://pythonhosted.org/mwdiffs/ which provides some nice utilities for parallel processing diffs from MediaWiki dumps using the `deltas` library.  See http://pythonhosted.org/mwdiffs/utilities.html.  Those utilities will natively parallelize computation so that you can divide the total runtime (100 days) by how many CPUs you have to run with.  E.g. 100 days / 16 CPUs = 6.3 days.   On a hadoop streaming setup (Altiscale), I've been able to get the whole English Wikipedia history processed in 48 hours, so it's not a massive benefit -- yet.  

-Aaron 

On Wed, Jan 20, 2016 at 8:49 AM, Flöck, Fabian <Fabian.Floeck@gesis.org> wrote:

Hi, you can also look at our WikiWho code, we have tested it to extract the changes between revisions considerably faster than a simple diff. see here: https://github.com/maribelacosta/wikiwho . you would have to adapt the code a bit to give you the pure diffs though. let me know if you need help. 

best, 

fabian

On 20.01.2016, at 13:15, Scott Hale <computermacgyver@gmail.com> wrote:

Hi Bowen,

You might compare the performance of Aaron Halfaker's deltas library: https://github.com/halfak/deltas

(You might have already done so, I guess, but just in case)

In either case, I suspect the tasks will need to be parallelized to be achieved in a reasonable time scale. How many editions are you working with?

Cheers,

Scott

On Wed, Jan 20, 2016 at 10:44 AM, Bowen Yu <yuxxx856@umn.edu> wrote:

Hello all,

I am a 2nd PhD student working in Grouplens Research group at the University of Minnesota - Twin Cities. Recently, I am working on a project to study how identity based and bond based theories would help understand editor's behavior in WikiProjects within the group context, but I am having a technical problems that need help and advise.

I am trying to parse each revision content of the editors from the XML dumps - the contents they added or deleted in each revision. I used the compare function in difflib to obtain the added or deleted contents by comparing two string objects, which runs extremely slow when the strings are huge specifically in the case of the Wikipedia revision contents. Without any parallel processing techniques, the expecting runtime to download and parse the 201 dumps would be ~100+ days.. I was pointed to altiscale, but not yet sure exactly how to use it for my problem.

It would be really great if anyone would give me some suggestion to help me make more progress. Thanks in advance!

Sincerely,

Bowen

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--

Dr Scott Hale

Data Scientist
Oxford Internet Institute
University of Oxford
http://www.scotthale.net/
scott.hale@oii.ox.ac.uk

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Gruß, 
Fabian

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Fabian Flöck

Research Associate

Computational Social Science department @GESIS
Unter Sachsenhausen 6-8, 50667 Cologne, Germany
Tel: + 49 (0) 221-47694-208
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