SAMOA A Platform for Mining Big Data Streams Gianmarco De Francisci Morales Yahoo! Research Barcelona [email protected] RGB color version - for online/web use 3D Y-Bang Logo 1 

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Web Mining Yahoo! Research Barcelona 3 RGB color version - for online/web use 3D Y-Bang Logo 

Taxonomy Machine Learning Distributed Batch Hadoop Mahout Stream S4, Storm SAMOA Non Distributed Batch R, WEKA, … Stream MOA 4 RGB color version - for online/web use 3D Y-Bang Logo 

Agenda Stream processing engine retrospective MapReduce for stream processing SAMOA Motivation Challenges 5 RGB color version - for online/web use 3D Y-Bang Logo 

Streaming Sequence is potentially infinite High amount of data, high speed of arrival Change over time (concept drift) Approximation algorithms (small error with high probability) Single pass, one data item at a time Sublinear space and time per data item 6 RGB color version - for online/web use 3D Y-Bang Logo 

Big Data Volume + Velocity (+ Variety) Too large for single commodity server main memory Too fast for single commodity server CPU A solution should be: Distributed Scalable 7 RGB color version - for online/web use 3D Y-Bang Logo 

In the beginning… …it was the Database 8 RGB color version - for online/web use 3D Y-Bang Logo 

A tale of two tribes DB DB DB DB DB DB Data App App App Faster Larger Database M. Stonebraker and U. Çetintemel, “‘One Size Fits All’: An Idea Whose Time Has Come and Gone,” in ICDE ’05 A. Jacobs, “The Pathologies of Big Data,” Communications of the ACM, 52(8):36–44, Aug. 2009 9 RGB color version - for online/web use 3D Y-Bang Logo 

A tale of two tribes DB DB DB DB DB DB Data App App App Faster Larger Database M. Stonebraker and U. Çetintemel, “‘One Size Fits All’: An Idea Whose Time Has Come and Gone,” in ICDE ’05 A. Jacobs, “The Pathologies of Big Data,” Communications of the ACM, 52(8):36–44, Aug. 2009 9 RGB color version - for online/web use 3D Y-Bang Logo 

A tale of two tribes DB DB DB DB DB DB Data App App App Faster Larger Database M. Stonebraker and U. Çetintemel, “‘One Size Fits All’: An Idea Whose Time Has Come and Gone,” in ICDE ’05 A. Jacobs, “The Pathologies of Big Data,” Communications of the ACM, 52(8):36–44, Aug. 2009 9 RGB color version - for online/web use 3D Y-Bang Logo 

A tale of two tribes DB DB DB DB DB DB Data App App App Faster Larger Database M. Stonebraker and U. Çetintemel, “‘One Size Fits All’: An Idea Whose Time Has Come and Gone,” in ICDE ’05 A. Jacobs, “The Pathologies of Big Data,” Communications of the ACM, 52(8):36–44, Aug. 2009 9 RGB color version - for online/web use 3D Y-Bang Logo 

Evolution of SPEs 10 —2003 —2004 —2005 —2006 —2008 —2010 —2011 Aurora STREAM Borealis SPC SPADE Storm S4 1st generation 2nd generation 3rd generation Abadi et al., “Aurora: a new model and architecture for data stream management,” VLDB Journal, 2003 Arasu et al., “STREAM: The Stanford Data Stream Management System,” Stanford InfoLab, 2004. Abadi et al., “The Design of the Borealis Stream Processing Engine,” in CIDR ’05 Amini et al., “SPC: A Distributed, Scalable Platform for Data Mining,” in DMSSP ’06 Gedik et al., “SPADE: The System S Declarative Stream Processing Engine,” in SIGMOD ’08 Neumeyer et al., “S4: Distributed Stream Computing Platform,” in ICDMW ’10 http://storm-project.net RGB color version - for online/web use 3D Y-Bang Logo 

S4 & Storm Top-k word count example 11 RGB color version - for online/web use 3D Y-Bang Logo 

S4 Overview Processing Element Zookeeper Event Streams Coordination Events Input Events Output Business logic goes here Processing Node 1 PE PE PE PE Processing Node 2 PE PE PE PE Processing Node 3 PE PE PE PE 12 RGB color version - for online/web use 3D Y-Bang Logo L. Neumeyer, B. Robbins, A. Nair, and A. Kesari, “S4: Distributed Stream Computing Platform,” in ICDMW ’10: 10th International Conference on Data Mining Workshops, 2010, pp. 170–177. 

S4 Example status.text:"Introducing #S4: a distributed #stream processing system" PE1 PE2 PE3 PE4 RawStatus null text="Int..." EV KEY VAL Topic topic="S4" count=1 EV KEY VAL Topic topic="stream" count=1 EV KEY VAL Topic reportKey="1" topic="S4", count=4 EV KEY VAL TopicExtractorPE (PE1) extracts hashtags from status.text TopicCountAndReportPE (PE2-3) keeps counts for each topic across all tweets. Regularly emits report event if topic count is above a configured threshold. TopicNTopicPE (PE4) keeps counts for top topics and outputs top-N topics to external persister 13 RGB color version - for online/web use 3D Y-Bang Logo 

Storm Overview 14 RGB color version - for online/web use 3D Y-Bang Logo 

Storm Example http://www.michael-noll.com/blog/2012/10/16/understanding-the-parallelism-of-a-storm-topology/ 15 RGB color version - for online/web use 3D Y-Bang Logo 

Actors Model (Active DHTs) Live Streams Stream 1 Stream 2 Stream 3 PE PE PE PE PE External Persister Output 1 Output 2 Event routing 16 RGB color version - for online/web use 3D Y-Bang Logo 

MapReduce DFS Input 1 Input 2 Input 3 MAP MAP MAP REDUCE REDUCE DFS Output 1 Output 2 Shuffle Merge & Group Partition & Sort 17 RGB color version - for online/web use 3D Y-Bang Logo 

Shoehorning “Mapreduce is Good Enough? If All You Have is a Hammer, Throw Away Everything That’s Not a Nail!” [J. Lin, in Big Data, 1(1):28–37, 2013] Can we reuse the MapReduce programming model for stream mining? A review of online, streaming, and incremental computation on MapReduce 18 RGB color version - for online/web use 3D Y-Bang Logo 

HOP Pipelining within and across jobs (however map from job2 cannot start until reduce from job1 has finished) Online aggregation for interactive queries Compute reduce function on data received so far at predetermined milestones (every 20%) However cannot reuse partial computation across reduce invocations Continuous queries by combining the 2 techniques 19 RGB color version - for online/web use 3D Y-Bang Logo T. Condie, N. Conway, P. Alvaro, J. M. Hellerstein, K. Elmeleegy, and R. Sears, “MapReduce Online,” in NSDI ’10 

Incoop Task level memoization (save results of function calls, similar to dynamic programming) Need to have MapReduce calls with same input Map - Incremental HDFS for stable input partitioning Reduce - Contraction (combiner) to reuse partial results (small change in input changes all output) Tree-aggregation avoids linear dependencies among different contractions (more reuse) 20 RGB color version - for online/web use 3D Y-Bang Logo P. Bhatotia, A. Wieder, R. Rodrigues, U. A. Acar, and R. Pasquin, “Incoop: MapReduce for Incremental Computations,” in SOCC ’11 

StreamMapReduce Backward-compatible extension of MapReduce API Map = stateless function Reduce Windowed = defined over a window (tumbling, sliding) Stateful = custom definition of state (time triggered) Actors model in disguise! 21 RGB color version - for online/web use 3D Y-Bang Logo A. Brito, A. Martin, T. Knauth, S. Creutz, D. Becker, S. Weigert, and C. Fetzer, “Scalable and Low-Latency Data Processing with Stream MapReduce,” in CloudCom ’11 

Muppet MapUpdate = streaming version of MapReduce Map = stateless function, Update = stateful function Slate = external memory for Update, keyed on events, lazily allocated, persisted in a KV storage Workflow is a DAG, nodes are MapUpdate functions, edges are event streams Actors model in disguise! 22 RGB color version - for online/web use 3D Y-Bang Logo W. Lam, L. Liu, S. Prasad, A. Rajaraman, Z. Vacheri, and A. Doan, “Muppet: MapReduce-Style Processing of Fast Data,” VLDB 5(12):1814–1825, 2012. 

MapReduce for streams? Can be done, but most approaches reinvent the actors model 3rd gen SPEs are the natural choice Need to rethink algorithms :( Opportunities for new algorithms :) 23 RGB color version - for online/web use 3D Y-Bang Logo 

SAMOA Scalable Advanced Massive Online Analysis Albert Bifet Gianmarco De Francisci Morales Nicolas Kourtellis Matthieu Morel Arinto Murdopo Antonio Severien 24 RGB color version - for online/web use 3D Y-Bang Logo 

Motivation Big Data + Streaming What is happening now? Use feedback in real-time Update models faster: from weeks to seconds Adapt to changes, concept drift Resist adversarial interactions 25 RGB color version - for online/web use 3D Y-Bang Logo 

Importance$of$O •  As$spam$trends$change retrain$the$model$with Importance Spam detection in comments on Yahoo! News Trends change in time Need to retrain model with new data 26 RGB color version - for online/web use 3D Y-Bang Logo 

Is SAMOA useful for you? Only if you need to deal with: Big fast data Evolving data (model updates) Concept drift: discriminative features or class distribution change Example: Twitter spam detection. Hashtags and their co-occurrences change dramatically and very fast over time 27 RGB color version - for online/web use 3D Y-Bang Logo 

Architecture SAMOA S4 Storm … SAMOA Classifier Methods Clustering Methods Frequent Pattern Mining 28 RGB color version - for online/web use 3D Y-Bang Logo 

Advantages Program once, run everywhere Reuse existing computational infrastructure Model is always up to date No system downtime No complex backup/update procedures No need to choose update frequency 29 RGB color version - for online/web use 3D Y-Bang Logo 

What about Mahout? Think SAMOA = Mahout for streaming But SAMOA… More than JBoA (just a bunch of algorithms) Provides a common platform Easy to port to new computing engines 30 RGB color version - for online/web use 3D Y-Bang Logo 

Taxonomy Machine Learning Distributed Batch Hadoop Mahout Stream S4, Storm SAMOA Non Distributed Batch R, WEKA, … Stream MOA 31 RGB color version - for online/web use 3D Y-Bang Logo 

Short-Term Goals Parallel algorithms Hoeffding tree K-means-based clustering Gradient Boosted Decision Trees Platforms: S4 & Storm First release in July 32 RGB color version - for online/web use 3D Y-Bang Logo 

Long-Term Goals Easy to integrate add-ons with packages (like R) Most common algorithms implemented (like Mahout) Large community in industry & academia (like Hadoop) Become reference platform for big data stream mining (like Weka) Lively open-source project (Apache Incubator) 33 RGB color version - for online/web use 3D Y-Bang Logo 

Challenges Algorithmic Platform design Implementation 34 RGB color version - for online/web use 3D Y-Bang Logo 

Algorithmic Case study: Hoeffding tree What kind of parallelism? Task Data Horizontal Vertical 35 RGB color version - for online/web use 3D Y-Bang Logo 

Task Parallelism 36 RGB color version - for online/web use 3D Y-Bang Logo 

Horizontal Parallelism Stats Stats Stats Stream Histograms Model Instances Y. Ben-Haim and E. Tom-Tov, “A Streaming Parallel Decision Tree Algorithm,” The Journal of Machine Learning Research, vol. 11, pp. 849–872, Mar. 2010. 37 RGB color version - for online/web use 3D Y-Bang Logo 

Vertical Parallelism Stats Stats Stats Stream Model Attributes Splits 38 RGB color version - for online/web use 3D Y-Bang Logo 

Other 6% Split 24% Learn 70% Training CPU Time breakdown, 100 nominal 100 numeric attributes Hoeffding Tree Profiling 39 RGB color version - for online/web use 3D Y-Bang Logo 

Vertical Parallelism High number of attributes (e.g., documents) results in high level of parallelism Parallelism is observed immediately (compared to task parallelism) Localized failure handling and model updates (model is kept in one node) Less memory usage compared to horizontal partitioning (no model replication) 40 RGB color version - for online/web use 3D Y-Bang Logo 

Platform Design What is the right level of abstraction? Application building Computation Communication 41 RGB color version - for online/web use 3D Y-Bang Logo 

ML Developer API 42 RGB color version - for online/web use 3D Y-Bang Logo Processing Item Processor Stream 

ML Developer API ProcessingItem sourceOnePi = builder.createProcessingItem(new SourceProcessor()); Stream streamOne = builder.createStream(sourceOnePi); ProcessingItem sourceTwoPi = builder.createProcessingItem(new SourceProcessor()); Stream streamTwo = builder.createStream(sourceTwoPi); String key = "record_id"; ProcessingItem joinPi = builder.createProcessingItem(new IntermediateProcessor()) .connectInputShuffle(streamOne); .connectInputKey(streamTwo, key); 43 RGB color version - for online/web use 3D Y-Bang Logo 

Implementation How to hide platform differences? Deployment Runtime How to isolate platform-related code? Build and release architecture 44 RGB color version - for online/web use 3D Y-Bang Logo 

Deployment SAMOA-S4.jar SAMOA-API.jar SAMOA-Storm.jar samoa-storm-deployable.jar samoa-s4-deployable.s4r S4 bindings Storm bindings API. Algorithm developer depends only on this To S4 cluster To Storm cluster 45 RGB color version - for online/web use 3D Y-Bang Logo 

Runtime 46 RGB color version - for online/web use 3D Y-Bang Logo SAMOA EPI EPI PI PI PI PI S4 PE PE PE PE PE PE Storm Spout Spout Bolt Bolt Bolt Bolt 

Conclusions SAMOA: A Platform for Mining Big Data Streams Runs on existing distributed stream processing engines Parallel algorithms for machine learning on streams Pluggable architecture, flexible, extensible, open source Available soon! 47 RGB color version - for online/web use 3D Y-Bang Logo 

Thanks! 48 RGB color version - for online/web use 3D Y-Bang Logo [email protected] 

References [1] D. J. Abadi, D. Carney, U. Cetintemel, M. Cherniack, C. Convey, S. Lee, M. Stonebraker, N. Tatbul, and S. Zdonik, “Aurora: a new model and architecture for data stream management,” VLDB Journal, vol. 12, no. 2, pp. 120–139, Aug. 2003. [2] A. Bifet, G. Holmes, R. Kirkby, and B. Pfahringer, “MOA: Massive Online Analysis,” The Journal of Machine Learning Research, vol. 11, pp. 1601–1604, 2010. [3] Gartner, “Gartner Says Solving ‘Big Data’ Challenge Involves More Than Just Managing Volumes of Data,” 2011. [Online]. Available: http://www.gartner.com/it/page.jsp?id=1731916. [4] B. Gedik, H. Andrade, K.-L. Wu, P. S. Yu, and M. Doo, “SPADE: The System S Declarative Stream Processing Engine,” in SIGMOD ’08: 34th International Conference on Management of Data, 2008, pp. 1123– 1134. [5] V. Kumar, H. Andrade, B. Gedik, and K.-L. Wu, “DEDUCE: At the Intersection of MapReduce and Stream Processing,” in EDBT ’10: 13th International Conference on Extending Database Technology, 2010, pp. 657– 662. [6] C. Olston, S. Seth, C. Tian, T. ZiCornell, X. Wang, G. Chiou, L. Chitnis, F. Liu, Y. Han, M. Larsson, A. Neumann, V. B. N. Rao, and V. Sankarasubramanian, “Nova: Continuous Pig/Hadoop Workflows,” in SIGMOD ’11: 37th International Conference on Management of Data, 2011, pp. 1081–1090. [7] L. Neumeyer, B. Robbins, A. Nair, and A. Kesari, “S4: Distributed Stream Computing Platform,” in ICDMW ’10: 10th International Conference on Data Mining Workshops, 2010, pp. 170–177. 49 

[8] D. J. Abadi, Y. Ahmad, M. Balazinska, M. Cherniack, J. Hwang, W. Lindner, A. S. Maskey, E. Rasin, E. Ryvkina, N. Tatbul, Y. Xing, and S. Zdonik, “The Design of the Borealis Stream Processing Engine,” in CIDR ’05: 1st Conference on Innovative Data Systems Research, 2005, pp. 277–289. [9] L. Amini, H. Andrade, R. Bhagwan, F. Eskesen, R. King, P. Selo, Y. Park, and C. Venkatramani, “SPC: A Distributed, Scalable Platform for Data Mining,” in DMSSP ’06: 4th international Workshop on Data Mining Standards, Services and Platforms, 2006, pp. 27–37. [10] A. Arasu, B. Babcock, S. Babu, J. Cieslewicz, M. Datar, K. Ito, R. Motwani, U. Srivastava, and J. Widom, “STREAM: The Stanford Data Stream Management System,” Stanford InfoLab, 2004. [11] P. Bhatotia, A. Wieder, R. Rodrigues, U. A. Acar, and R. Pasquin, “Incoop: MapReduce for Incremental Computations,” in SOCC ’11: 2nd ACM Symposium on Cloud Computing, 2011, pp. 1–14. [12] A. Brito, A. Martin, T. Knauth, S. Creutz, D. Becker, S. Weigert, and C. Fetzer, “Scalable and Low-Latency Data Processing with Stream MapReduce,” in CloudCom ’11: 3rd International Conference on Cloud Computing Technology and Science, 2011, pp. 48–58. [13] Y. Bu, B. Howe, M. Balazinska, and M. D. Ernst, “HaLoop: efficient iterative data processing on large clusters,” VLDB Endowment, vol. 3, no. 1–2, pp. 285–296, Sep. 2010. [14] T. Condie, N. Conway, P. Alvaro, J. M. Hellerstein, K. Elmeleegy, and R. Sears, “MapReduce Online,” in NSDI ’10: 7th Conference on Networked Systems Design and Implementation, 2010, p. 21. [15] J. Dean and S. Ghemawat, “MapReduce: Simplified Data processing on Large Clusters,” in OSDI ’04: 6th Symposium on Opearting Systems Design and Implementation, 2004, pp. 137–150. 50 References 

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