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A/B TESTING EVOLUTION

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MMOZURAS mmozuras CODINGFEARLESSLY.COM

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Make SECOND-HAND THE FIRST CHOICE WORLDWIDE

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A/B TEST

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EXPERIMENT ALL THE THINGS

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EXPERIMENT ALL THE THINGS MOST OF THE THINGS

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In THE OLDEN DAYS

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WHO NEEDS DOCUMENTATION?

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TESTS = { pill: { lt: 1.0, us: 0.5 }, upld: { lt: 0.5, de: 0.2 } }

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TESTS = { pill: { us: 1.0 }, pills: { us: 1.0 }, } if pill? && pills?

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CONTROL TEST GROUPS? ISOLATION?

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CONTROL TEST GROUPS? ISOLATION? NOPE

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STORING AB TEST ASSIGNMENT?

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STORING AB TEST ASSIGNMENT? MYSQL

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AB_TESTS ID: 1 VALUE: PILL_1,UPLD_0

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USERS.FIRST_AB_TEST_ID USERS.AB_TEST_ID LIKES.AB_TEST_ID

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AB: PILL_1,UPLD_0

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STORING EVENTS?

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STORING EVENTS? MYSQL

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EVENTS uSER_ID: 1 TYPE: …

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ANALYTICS? REPLICATE MYSQL

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EVERYTHING?

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EVERYTHING?! MYSQL

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BROUGHT TO YOU BY:

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EASY FAMILIAR

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MORE MORE MORE MORE MORE

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MORE USERS

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MORE DEVELOPERS

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KNOWLEDGE SCALING

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MORE AB TESTS

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PILL_1,THPS_0,UPLD_1

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PILL_1,THPS_0,UPLD_1, FFIX_0, FSHIP_0,MTG_1, WAY_1,OF_1,KINGS_1

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PILL_1,THPS_0,UPLD_1, FFIX_0, FSHIP_0,MTG_1, WAY_1,OF_1,KINGS_1, WORD_1,SOF_0,RAD_1,IAN_1,CE_1, STORM_0,LIGHT_1,ARCH_1,IVE_0

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MORE EVENTS

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1.21 GIGAWATTS THOUSANDS OF GIGABYTES

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BACK TO THE FUTURE

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RESEARCH DOZENS OF WHITEPAPERS AND PRESENTATIONS

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DOCUMENT IMPLICITLY GITHUB ISSUE WITH 70+ COMMENTS

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STORING AB TEST ASSIGNMENT?

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STORING AB TEST ASSIGNMENT? NOPE

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SHA256(USERS.ANON_ID)

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VINTED/AB

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bucket_id = SHA256(salt + id) % bucket_count return if not (test.buckets.include?(bucket_id)) return if not Time.now.between?(test.start_at, test.end_at) weight_id = SHA256(test.seed + id) % test.weight_sum test.variants.find do |v| v.accumulated_weight > weight_id end

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bucket_id = SHA256(salt + id) % bucket_count return if not (test.buckets.include?(bucket_id)) return if not Time.now.between?(test.start_at, test.end_at) weight_id = SHA256(test.seed + id) % test.weight_sum test.variants.find do |v| v.accumulated_weight > weight_id end

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bucket_id = SHA256(salt + id) % bucket_count return if not (test.buckets.include?(bucket_id)) return if not Time.now.between?(test.start_at, test.end_at) weight_id = SHA256(test.seed + id) % test.weight_sum test.variants.find do |v| v.accumulated_weight > weight_id end

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bucket_id = SHA256(salt + id) % bucket_count return if not (test.buckets.include?(bucket_id)) return if not Time.now.between?(test.start_at, test.end_at) weight_id = SHA256(test.seed + id) % test.weight_sum test.variants.find do |v| v.accumulated_weight > weight_id end

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CONTROL TEST GROUPS? ISOLATION?

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CONTROL TEST GROUPS? ISOLATION? YES

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ab = Ab::Tests.new(config, id) ab.pill.red? case ab.pill.variant when 'red' ‘real world’ when 'blue' ‘fabricated reality’ end

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VINTED/AB-JAVA VINTED/AB VINTED/AB-iOS

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{ "id": 42, "name": "pill", "start_at": "2014-05-21T11:06:30+0300", "end_at": "2014-05-28T11:06:30+0300", "variants": [ { "name": "red", "chance_weight": 5 }, { "name": "blue", "chance_weight": 2 } ] },

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AB CONFIG SERVICE

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ADMIN.vinted.NET/ EXPERIMENTS

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STORING EVENTS?

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STORING EVENTS? BIG DATA stack

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SIMPLE SCALE

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PERFECT SOLUTION?

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NO PERFECT SOLUTION

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NO PERFECT ARCHITECTURE

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NO PERFECT LANGUAGE

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EVOLVE

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THANKS!