On Thu, Nov 21, 2013 at 9:57 AM, Dario Taraborelli < [email protected]> wrote:
> I tried uploading a cohort from a recent A/B test (1,780 unique > user_id’s). The async validation took about 5 minutes to complete. > > If I create a temporary table with the data in my CSV and run a join with > the user table against a slave, the query to validate that these users > exist takes about 400ms if I use user_id (primary key in enwiki.user) and > about 3s using user_name (unique in enwiki.user). > > What’s the reason why it takes so long to validate a cohort in the > application? > My understanding is that this is due to Labs being slow compared to stat1? -- Steven Walling, Product Manager https://wikimediafoundation.org/
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