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Real-World NoSQL Schema Design
1.
© 2015 MapR
Technologies© 2016 MapR Technologies1 Real-World NoSQL Schema Design Tugdual Grall April 13, 2016
2.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall {“about” : “me”} Tugdual “Tug” Grall • MapR • Technical Evangelist • MongoDB • Technical Evangelist • Couchbase • Technical Evangelist • eXo • CTO • Oracle • Developer/Product Manager • Mainly Java/SOA • Developer in consulting firms • Web • @tgrall • http://tgrall.github.io • tgrall • NantesJUG co-founder • Pet Project : • http://www.resultri.com • tug@mapr.com • tugdual@gmail.com
3.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 3 Database Schema Design “ERD” - Logical For RDBMS: Entities => Tables Attributes => Columns Relationships => Foreign Keys Many-to-Many => Junction Table
4.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 4 SEMI-STRUCTURED DATA STRUCTURED DATA 1980 2000 20101990 2020 Data is Doubling Every Two Years Source: Human-Computer Interaction & Knowledge Discovery in Complex Unstructured, Big Data TotalDataStored Unstructured data will account for more than 80% of the data collected by organizations
5.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 5 Big Datastore Distributed File System HDFS/MapR-FS NoSQL Database HBase/MapR-DB
6.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 6 Store data as File or Row? HDFS / MapR-FS • Data stores as “files” • Fast with Large Scans • Slow random read/writes HBase/MapR-DB • Data stores as row/documents • Fast with random read/writes
7.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 7 NoSQL Database
8.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 8 Contrast Relational and HBase Style noSQL Relational • Rows containing fields • Fields contain primitive types • Structure is fixed and uniform • Structure is pre-defined • Referential integrity (optional) • Expressions over sets of rows HBase / MapR DB • Rows contain fields • Fields bytes • Structure is flexible • No pre-defined structure • Single key • Column families • Timestamps • Versions
9.
© 2016 MapR
Technologies© 2016 MapR Technologies@tgrall 9 Mix Models for Databases • Allows complex objects in field values • JSON style lists and objects • Allow references to objects via join • Includes references localized within lists • Lists of objects and objects of lists are isomorphic to tables so … • Complex data in tables, • But also tables in complex data, • Even tables containing complex data containing tables
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Technologies© 2016 MapR Technologies@tgrall 10 A Catalog of NoSQL Idioms
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Technologies© 2016 MapR Technologies@tgrall 11 Tables as Objects, Objects as Tables c1 c2 c3 Row-wise form c1 c2 c3 Column-wise form [ { c1:v1, c2:v2, c3:v3 }, { c1:v1, c2:v2, c3:v3 }, { c1:v1, c2:v2, c3:v3 } ] List of objects { c1:[v1, v2, v3], c2:[v1, v2, v3], c3:[v1, v2, v3] } Object containing lists
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Technologies© 2016 MapR Technologies@tgrall 12 A first example: Time-series data
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Technologies© 2016 MapR Technologies@tgrall 13 Column names as data • When column names are not pre-defined, they can convey information • Examples • Time offsets within a window for time series • Top-level domains for web crawlers • Vendor id’s for customer purchase profiles • Predefined schema is impossible for this idiom
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Technologies© 2016 MapR Technologies@tgrall 14 Relational Model for Time-Series
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Technologies© 2016 MapR Technologies@tgrall 15 NoSQL Table Design: Point-by-Point
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Technologies© 2016 MapR Technologies@tgrall 16 Table Design: Hybrid Point-by-Point + Sub-table After close of window, data in row is restated as column-oriented tabular value in different column family.
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Technologies© 2016 MapR Technologies@tgrall 17 A second example: Music Application https://musicbrainz.org/
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Technologies© 2016 MapR Technologies@tgrall 18 MusicBrainz on NoSQL • Artists, albums, tracks and labels are key objects • Reality check: • Add works (compositions), recordings, release, release group • 7 tables for artist alone • 12 for place, 7 for label, 17 for release/group, 8 for work • (but only 4 for recording!) • Total of 12 + 7 + 17 + 8 + 4 = 48 tables • But wait, there’s more! • 10 annotation tables, 10 edit tables, 19 tag tables, 5 rating tables, 86 link tables, 5 cover art tables and 3 tables for CD timing info (138 total) • And 50 more tables that aren’t documented yet
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Technologies© 2016 MapR Technologies@tgrall 19
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Technologies© 2016 MapR Technologies@tgrall 20 180 tables not shown
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Technologies© 2016 MapR Technologies@tgrall 21 236 tables to describe 7 kinds of things
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Technologies© 2016 MapR Technologies@tgrall 22 Can we do better?
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Technologies© 2016 MapR Technologies@tgrall 23
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Technologies© 2016 MapR Technologies@tgrall 24 artist id gid name sort_name begin_date end_date ended type gender area being_area end_area comment list<ipi> list<isni> list<alias> list<release_id> list<recording_id>
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Technologies© 2016 MapR Technologies@tgrall 25
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Technologies© 2016 MapR Technologies@tgrall 26 {id, recording_id, name, list<credit> length} recording id gid list<credit> name list<track_ref> {id, format, name, list<track>} release_group id gid name list<credit> type list<release_id>
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Technologies© 2016 MapR Technologies@tgrall 27 27 tables reduce to 4
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Technologies© 2016 MapR Technologies@tgrall 28 27 tables reduce to 4 so far
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Technologies© 2016 MapR Technologies@tgrall 29 Further Reductions • All 86 link tables become properties on artists, releases and other entities • All 44 tag, rating and annotation tables become list properties • All 5 cover art tables become lists of file references • Current score: 162 tables become 4 • You get the idea
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Technologies© 2016 MapR Technologies@tgrall 30 Artist in HBase/MapR-DB get '/apps/db/music/artist_hbase', 'nirvana' COLUMN CELL default:begin_date timestamp=1460500945476, value=1988-01-01 default:end_data timestamp=1460500945509, value=1994-04-05 default:ended timestamp=1460500945538, value=true default:name timestamp=1460500945438, value=Nirvana list:albums timestamp=1460500945578, value=[ {“title”:"In Utero", "released" : “1993-09-21"}, {"title":"Nevermind", "released" : "1991-09-24"}, {"title":"Bleach", "released" : "1989-06-15"}]
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Technologies© 2016 MapR Technologies@tgrall 31 NoSQL Data Model
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Technologies© 2016 MapR Technologies@tgrall 32 Scalable databases Document databases Ease of use Developer friendly Flexible Scalable, parallel Binary API Performant
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Technologies© 2016 MapR Technologies@tgrall 33 Scalable databases Document databases Mapr JSON DBMapr JSON DB or OJAI + other DB
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Technologies© 2016 MapR Technologies@tgrall 34 JSON Document : Flexible Schema • Support Data-Types • Complex Data Structure • Developer Friendly • http://json.org • Flexible • Easy to evolve • Start right, stay right { "_id" : "001-003-ABC", "first_name" : "John", "last_name" : "Doe", "email" : "jdoe@doe.com", "dob" : “1970-04-23", "points : 55000, "interests" : ["sports", "movies"], "address" : { "street" : "1212 Maple Street", "city" : "San Jose", "state" : "CA", "zip" : "95101" }, "sessions" : [ {“id":"CoD4","ts":1439824477}, {"id":"fifa14""ts": 1439565276} ] }
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Technologies© 2016 MapR Technologies@tgrall 35 JSON Document : Flexible Schema { "_id" : "001-003-ABC", "first_name" : "John", "last_name" : "Doe", "email" : "jdoe@doe.com", "dob" : “1970-04-23", "points : 55000, "interests" : ["sports", "movies"], "address" : { "street" : "1212 Maple Street", "city" : "San Jose", "state" : "CA", "zip" : "95101" }, "sessions" : [ {“id":"CoD4","ts":1439824477}, {"id":"fifa14""ts": 1439565276} ] } Attributes Types String Numbers Arrays } Nested Doc } Arrays of Doc
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Technologies© 2016 MapR Technologies@tgrall 36 No SQL : use cases Key Value Session Management User Profile/Preferences Shopping Cart Document Event Logging Content Management Web Analytics Product Catalog Single View e-Commerce Wide Column Event Logging Content Management Counters Graph Social Network Routing/Dispatch Recommendation on Social Graph MapR-DB- JSON MapR-DB- HBase
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Technologies© 2016 MapR Technologies@tgrall 37 No SQL : use cases Key Value Session Management User Profile/Preferences Shopping Cart Document Event Logging Content Management Web Analytics Product Catalog Single View e-Commerce Wide Column Event Logging Content Management Counters Graph Social Network Routing/Dispatch Recommendation on Social Graph MapR-DB- JSON MapR-DB- HBase
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Technologies 38 Flexible Schema in Action
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Technologies© 2016 MapR Technologies@tgrall 39 Product Catalog - RDBMS SELECT * FROM ( SELECT ce.sku, ea.attribute_id, ea.attribute_code, CASE ea.backend_type WHEN 'varchar' THEN ce_varchar.value WHEN 'int' THEN ce_int.value WHEN 'text' THEN ce_text.value WHEN 'decimal' THEN ce_decimal.value WHEN 'datetime' THEN ce_datetime.value ELSE ea.backend_type END AS value, ea.is_required AS required FROM catalog_product_entity AS ce LEFT JOIN eav_attribute AS ea ON ce.entity_type_id = ea.entity_type_id LEFT JOIN catalog_product_entity_varchar AS ce_varchar ON ce.entity_id = ce_varchar.entity_id AND ea.attribute_id = ce_varchar.attribute_id AND ea.backend_type = 'varchar' LEFT JOIN catalog_product_entity_text AS ce_text ON ce.entity_id = ce_text.entity_id AND ea.attribute_id = ce_text.attribute_id AND ea.backend_type = 'text' LEFT JOIN catalog_product_entity_decimal AS ce_decimal ON ce.entity_id = ce_decimal.entity_id AND ea.attribute_id = ce_decimal.attribute_id AND ea.backend_type = 'decimal' LEFT JOIN catalog_product_entity_datetime AS ce_datetime ON ce.entity_id = ce_datetime.entity_id AND ea.attribute_id = ce_datetime.attribute_id AND ea.backend_type = 'datetime' WHERE ce.sku = ‘rp-prod132546’ ) AS tab WHERE tab.value != ’’; “Entity Value Attribute” Pattern To get a single product
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Technologies© 2016 MapR Technologies@tgrall 40 Product Catalog - NoSQL/Document Store the product “as a business object” { "_id" : "rp-prod132546", "name" : "Marvel T2 Athena”, "brand" : "Pinarello", "category" : "bike", "type" : "Road Bike”, "price" : 2949.99, "size" : "55cm", "wheel_size" : "700c", "frameset" : { "frame" : "Carbon Toryaca", "fork" : "Onda 2V C" }, "groupset" : { "chainset" : "Camp. Athena 50/34", "brake" : "Camp." }, "wheelset" : { "wheels" : "Camp. Zonda", "tyres" : "Vittoria Pro" } } products .findById(“rp-prod132546”) To get a single product
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Technologies 41 Easy variation with Documents { "_id" : "rp-prod132546", "name" : "Marvel T2 Athena”, "brand" : "Pinarello", "category" : "bike", "type" : "Road Bike”, "price" : 2949.99, "size" : "55cm", "wheel_size" : "700c", "frameset" : { "frame" : "Carbon Toryaca", "fork" : "Onda 2V C" }, "groupset" : { "chainset" : "Camp. Athena 50/34", "brake" : "Camp." }, "wheelset" : { "wheels" : "Camp. Zonda", "tyres" : "Vittoria Pro" } } { "_id" : "rp-prod106702", "name" : " Ultegra SPD-SL 6800”, "brand" : "Shimano", "category" : "pedals", "type" : "Components, "price" : 112.99, "features" : [ "Low profile design increases ...", "Supplied with floating SH11 cleats", "Weight: 260g (pair)" ] } { "_id" : "rp-prod113104", "name" : "Bianchi Pride Jersey SS15”, "brand" : "Nalini", "category" : "Jersey", "type" : "Clothing, "price" : 76.99, "features" : [ "100% Polyester", "3/4 hidden zip", "3 rear pocket" ], "color" : "black" }
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Technologies© 2016 MapR Technologies@tgrall 42 Back-end data matches front-end expectations
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Technologies© 2016 MapR Technologies@tgrall 43 Add features easily • Requirement: “users can vote and comment product” { "_id" : "rp-prod113104", "name" : "Bianchi Pride Jersey SS15”, "brand" : "Nalini", "category" : "Jersey", "type" : "Clothing, "price" : 76.99, "features" : [ "100% Polyester", "3/4 hidden zip", "3 rear pocket" ], "color" : “black”, Done: just store the data! Means less time to market { "_id" : "rp-prod113104", "name" : "Bianchi Pride Jersey SS15”, "brand" : "Nalini", "category" : "Jersey", "type" : "Clothing, "price" : 76.99, "features" : [ "100% Polyester", "3/4 hidden zip", "3 rear pocket" ], "color" : “black”, "comments" : [{…}, {…}], "ratings" : [{…, “value" : 5}, {…, value : 3}], “rating” : 4 }
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Technologies© 2016 MapR Technologies@tgrall 44 JSON documents make data modeling easy 19
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Technologies© 2016 MapR Technologies@tgrall 45 An artist look find '/apps/db/music/artist_json', 'nirvana' { "_id" : "nirvana", "name" : "Nirvana", "begin_date" : "1988-01-01", "end_data" : "1994-04-05" "ended" : true, "albums" : [ {"title":"In Utero", "released" : "1993-09-21"}, {"title":"Nevermind", "released" : "1991-09-24"}, {"title":"Bleach", "released" : "1989-06-15"} ] }
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Technologies© 2016 MapR Technologies@tgrall 46 Artist in HBase/MapR-DB get '/apps/db/music/artist_hbase', 'nirvana' COLUMN CELL default:begin_date timestamp=1460500945476, value=1988-01-01 default:end_data timestamp=1460500945509, value=1994-04-05 default:ended timestamp=1460500945538, value=true default:name timestamp=1460500945438, value=Nirvana list:albums timestamp=1460500945578, value=[ {“title”:"In Utero", "released" : “1993-09-21"}, {"title":"Nevermind", "released" : "1991-09-24"}, {"title":"Bleach", "released" : "1989-06-15"}]
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Technologies© 2016 MapR Technologies@tgrall 47 How does it work • MapR JSON DB inherits almost all aspects of MapR DB – Columns families (but now defined on the fly) – Column level security • MapR-DB JSON – does NOT store JSON document “string” – stores “real” data types (not Javascript Type) • OJAI (open source) can add similar capabilities to other db’s • http://ojai.io/ (/ OH-hy /)
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Technologies© 2016 MapR Technologies@tgrall 48 Developers love JSON because…. • API is really easy to use : – you deal with your business objects • All operations to manipulate the fields, structure – Add/Remove Fields – Update Values, including sub documents, arrays – Increments
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Technologies© 2016 MapR Technologies@tgrall 49 Why is the developer so happy? • Can build a quick and dirty MVP that evolves • Can update application just a little bit • Can tune performance later using column families
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Technologies© 2016 MapR Technologies@tgrall 50 Why is the developer so happy? • Expressive: lets you say what you need to say – Developer hate circumlocution … say what you mean, don’t repeat yourself • Efficient (remember how much easier to get one product?) – Simple designs run better because you can get them right • Human readable: you can introspect
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Technologies© 2016 MapR Technologies@tgrall 51 SQL on NoSQL
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Technologies© 2016 MapR Technologies@tgrall 52 Hbase Columnar select convert_from(t.row_key, 'UTF8') id, convert_from(t.`default`.`name`, 'UTF8') name, convert_from(convert_from(t.list.albums, 'UTF8'), 'JSON') albums from hbase.`/apps/db/music/artist_hbase` t
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Technologies© 2016 MapR Technologies@tgrall 53 Document Database (MapR-DB JSON) select t._id, t.name, t.albums from maprdb.`/apps/db/artist_json` t
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Technologies© 2016 MapR Technologies@tgrall 54 Summary
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Technologies© 2016 MapR Technologies@tgrall 55 Some Tips • Carefully select rowkey/id & keys • Design for “your application” • Design for “questions” not “answers” (Highly Scalable Blog) • Rows are updated atomically • Use Pre Aggregation
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Technologies© 2016 MapR Technologies@tgrall 56
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Technologies© 2016 MapR Technologies@tgrall 57 Q&A @tgrall maprtech tug@mapr.com Engage with us! MapR maprtech mapr-technologies
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