max_revids as a config param.

[halfak]

There should be a way to limit the maximum number of revisions that can be requested from ORES. Right now, ORES will try to deal with as many revids as you can fit in the URL.

[kenrick95]

Based on this StackOverflow question, the maximum URL length is around 2000 characters. So, theoretically, we can put around 175 revids in the request:

• For each revid, it will take 11 characters:
  • The revid in wikidatawiki (the wiki with longest dbname that is supposed by ORES) requires 9 characters, and I expect it to grow to 10 characters in near future;
  • plus 1 character for the separator in the request (|)
• The base URL to make the ORES call requires 74 characters: https://ores.wikimedia.org/v3/scores/wikidatawiki/?models=damaging&revids=

So, (2000 - 74) / 11 ≈ 175

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Anyway, what's the maximum number of revids do you recommend in one ORES query? Is there a timeout or caching concern for making such huge request?

Thanks

[halfak]

I think we ought to limit this to 50 because that's what the mwapi will allow when we're querying content.

I just confirmed that ORES will in fact take more than 50 revids without error or warning.