Learning at scale on Hadoop
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1 Learning at scale on Hadoop Olivier Toromanoff, Software engineer Berlin Buzzwords, Copyright 2014 Criteo
2 Criteo Learning on Hadoop Limits are lower than the sky From Experimentation to Production: a model lifecycle Copyright 2014 Criteo
3 Criteo: Performance advertising «The right ad at the right time to the right user» Background Layout Opt out link Slogans WARM MEETS LIGHT ALL ORIGINALS #REPRESENT SWEET NOTHING ADDIDAS IS ALL IN Call to actions all original #represent JOIN NOW JOIN NOW JOIN NOW SHOP NOW SHOP NOW SHOP NOW JOIN NOW Butons SEE MORE SEE MORE CLICK HERE CLICK HERE 6ms Colours
4 Criteo: Performance advertising Client Publisher CPC CP M * CPC
5 Criteo: Some numbers +12 K 6 DATA CENTERS MORE THAN SERVERS PEAK TRAFFIC (PER SECOND) 800K HTTP REQUESTS CDH4 CLUSTER OF 1200 NODES (36TB, 96GB RAM, 24 cores)
6 The display cycle Learning Displ ay At real time, we predict for: - Campaign selection - Bidding - Product recommendation - Layout customization Logs generation User event : Click / Sales Tracking
7 Click prediction modelling = (logistic) = (geometric)
8 The nice sides of Logistic Regression Convex Optimisation Solvable with iterative Gradient Descent Algorithms (L-BFGS) Fast Prediction at runtime
9 Criteo Learning on Hadoop Limits are lower than the sky From Experimentation to Production: a model lifecycle Copyright 2014 Criteo
10 Need for Scale Learning a model : 7 days of data clicks / displays ~ 7 TB compressed lines ~ 90 features / lines and we have ~200 of them (click/sales/ x DCs x ABTests).. and we want to refresh as much as possible..
11 But a strong «legacy» Existing in-house Machine Learning library in C# Front-end code in C# Do we really want to: Re-implement missing functionalities in open source library? Rewrite all the learning code base from scratch? Take the risk to introduce and maintain a cross language duplication? hmmm.. let s try to run C# on Hadoop!
12 Let s meet «Recor drea der Recor drea der in» Streamin g stdi n mono MyMapper.exe stdou t Shuf e stdi n stdi n mono MyMapper.exe stdou t mono MyReducer.exe stdou t HDFS
13 Taming the beast Limitation on arguments length Fitting Mono VM + JVM into container memory Additional mini sub-processes in Java to interact with HDFS Stumbling upon Mono NotImplementedException Still (rare) issues with Mono: Crashes when Garbage Collector under heavy load Hanging threads
14 But iterative? You said iterative? Data + Solution n MAP Converge in 10 to 50 iterations MAP REDUC E Solution n+1 MAP
15 Let s «all-reduce» Mappe r Mappe r Mappe r Reduce r Cache on Reduce r Cache on disk Reduce r Cache on disk Reduce r Cache on disk Reduce r Cache on disk disk ZooKeep er
16 Distributing ain t easy No resilience to reducer crashes Keeping reducers for up to 3h Processing will start only when all reducers are provisioned
17 One (production) year later ~ 1300 models/day Ingesting 596 TB/day Consuming 6310 CPU day/day Learning time: [10min; 3h] Refresh rate: [3h; 6h] Last two weeks success rate: 97.4%
18 Criteo Learning on Hadoop Limits are lower than the sky From Experimentation to Production: a model lifecycle Copyright 2014 Criteo
19 Big cluster, small gateway Jobs are all launched from a single machine Asynchronous jobs in Yarn containers
20 Wasting resources is easy ( and painful) We started to see jobs waiting containers for hours Loooots of small mappers CombineFileInputFormat
21 What about further scaling? 98% success rate is good for now What about 2x more models, more data, more reducers,
22 Criteo Learning on Hadoop Limits are lower than the sky From Experimentation to Production: a model lifecycle Copyright 2014 Criteo
23 Hello «TestFramework»! An internal tool that replays Prod traffic from logs Used to: Train models Exercise models Compute metrics
24 Prediction analytics Observations: Basic (clicks, ) Prediction (Observed Ctr, Logged PCtr, Simulated PCtr) Metrics: Basic (count, ) ML (MSE, LLH, ) ML+Business (MSE_weightedBy*, ) Business (Advertiser added value, Criteo gross, )
25 Prediction analytics: MR job Mapper s Parsing/Filtering/Transformation Parsing/Filtering/Transformation dim1=mod1; dim1=mod1; dimn=modn dimn=modn Historic al Prod Logs Prediction Prediction dim1=mod1; dim1=mod1; dimn=modn; dimn=modn; Pred1=p1 Pred1=p1 PreAggregation PreAggregation SELECT SELECT metrics(observations) metrics(observations) GROUP GROUP BY BY dimensions dimensions PreAggrega ted Result Reduc er Final Aggregation Resul t
26 Offline ABTesting My model improved this fancy MSE_weightedBy430 yeah!.. weeks of productification work latter, IRL it under Counterfactual analysis: performed :( Online exploration allows us to do ofine evaluation of how the tested model would have performed
27 From Offline Test to ABTest
28 ABTest monitoring Positive
29 In metrics we trust My ABTest: +0.3% on the first 2 hours yeah!.. but 2 days after: -1% was it just noise? Computing confidence interval using bootstrapping: By computing metrics from several instances of the dataset generated with random sampling, we get accuracy measures
30 Wrapping-up Prediction at the core of Criteo s platform Thanks to Hadoop, we could greatly distribute our learnings: 1300 models learnt from 600TB daily Even with somewhat unorthodox implementation: 97.4% success rate mono + Hadoop Streaming all-reduce Some resources optimization needed to scale An integrated testbed from Ofine ABTest to monitoring metrics
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