Become a super modeler
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Become a super modeler

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Slides from my webinar May 16, 2013.

Slides from my webinar May 16, 2013.

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  • Just a short question for my understanding: Why don't you use an index created by CREATE INDEX instead of creating own tables (like tag_index on slide 18)?
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Become a super modeler Become a super modeler Presentation Transcript

  • Become a super modelerPatrick McFadin @PatrickMcFadinSenior Solutions ArchitectDataStaxThursday, May 16, 13
  • Become a super modelerPatrick McFadin @PatrickMcFadinSenior Solutions ArchitectDataStaxThursday, May 16, 13
  • ... the saga continues.This is the second part of a data modeling seriesPart 1:The data model is dead, long live the data model!• Relational -> Cassandra topics• Basic entity modeling• one-to-many• many-to-many•Transaction like modelingThursday, May 16, 13
  • Becoming a super modeler• Data model is the key to happiness• Successful deployments depend on it• Not just a Cassandra problem...3Thursday, May 16, 13
  • Time series - BasicCREATE TABLE temperature (weatherstation_id text,event_time timestamp,temperature text,PRIMARY KEY (weatherstation_id,event_time));• Weather station collects regular temperature• Each weather station is a row• Each event is a new column in a wide rowThursday, May 16, 13
  • Time series - Super!• Every second? Row would be too big• Order by access pattern• Partition the rows by day- One weather station by day5CREATE TABLE temperature_by_day (weatherstation_id text,date text,event_time timestamp,temperature text,PRIMARY KEY ((weatherstation_id,date),event_time)) WITH CLUSTERING ORDER BY (event_time DESC);Compound row keyReverse sort: Last event, first on rowThursday, May 16, 13
  • User model - basic• Plain ole entity table• One primary key• Booooring6CREATE TABLE users (username text PRIMARY KEY,first_name text,last_name text,address1 text,city text,postal_code text,last_login timestamp);Thursday, May 16, 13
  • Cassandra feature - Collections• Collections give you three types:- Set- List- Map• Each allow for dynamic updates• Fully supported in CQL 3• Requires serialization so don’t go crazy7CREATE TABLE collections_example (! id int PRIMARY KEY,! set_example set<text>,! list_example list<text>,! map_example map<int,text>);Thursday, May 16, 13
  • Cassandra Collections - Set• Set is sorted by CQL type comparator8INSERT INTO collections_example (id, set_example)VALUES(1, {1-one, 2-two});set_example set<text>Collection name Collection type CQLTypeThursday, May 16, 13
  • Cassandra Collections - Set Operations9UPDATE collections_exampleSET set_example = set_example + {3-three} WHERE id = 1;UPDATE collections_exampleSET set_example = set_example + {0-zero} WHERE id = 1;UPDATE collections_exampleSET set_example = set_example - {3-three} WHERE id = 1;• Adding an element to the set• After adding this element, it will sort to the beginning.• Removing an element from the setThursday, May 16, 13
  • Cassandra Collections - List• Ordered by insertion10list_example list<text>Collection name Collection type CQLTypeINSERT INTO collections_example (id, list_example)VALUES(1, [1-one, 2-two]);Thursday, May 16, 13
  • Cassandra Collections - List Operations• Adding an element to the end of a list11UPDATE collections_exampleSET list_example = list_example + [3-three] WHERE id = 1;UPDATE collections_exampleSET list_example = [0-zero] + list_example WHERE id = 1;• Adding an element to the beginning of a listUPDATE collections_exampleSET list_example = list_example - [3-three] WHERE id = 1;• Deleting an element from a listThursday, May 16, 13
  • Cassandra Collections - Map• Key and value• Key is sorted by CQL type comparator12INSERT INTO collections_example (id, map_example)VALUES(1, { 1 : one, 2 : two });map_example map<int,text>Collection name Collection type Value CQLTypeKey CQLTypeThursday, May 16, 13
  • Cassandra Collections - Map Operations• Add an element to the map13UPDATE collections_exampleSET map_example[3] = three WHERE id = 1;UPDATE collections_exampleSET map_example[3] = tres WHERE id = 1;DELETE map_example[3]FROM collections_example WHERE id = 1;• Update an existing element in the map• Delete an element in the mapThursday, May 16, 13
  • User model - Super!•Take boring user table and kick it up• Great for static + some dynamic•Takes advantage of row level isolation14CREATE TABLE user_with_location (! username text PRIMARY KEY,! first_name text,! last_name text,! address1 text,! city text,! postal_code text,! last_login timestamp,! location_by_date map<timeuuid,text>);Thursday, May 16, 13
  • Super user profile - Operations• Adding new login locations to the map15UPDATE user_with_locationSET last_login = now(), location_by_date = {now() : 123.123.123.1}WHERE username=PatrickMcFadin;UPDATE user_with_locationUSING TTL 2592000 // 30 DaysSET last_login = now(), location_by_date = {now() : 123.123.123.1}WHERE username=PatrickMcFadin;• Adding new login locations to the map +TTL!Thursday, May 16, 13
  • Indexing• Indexing expresses application intent• Fast access to specific queries• Secondary indexes != relational indexes• Use information you have. No pre-reads.16Goals:1. Create row key for speed2. Use wide rows for efficiencyThursday, May 16, 13
  • Keyword index• Use a word as a key• Columns are the occurrence• Ex: Index of tag words about videos17CREATE TABLE tag_index (tag varchar,videoid uuid,timestamp timestamp,PRIMARY KEY (tag, videoid));VideoId1 .. VideoIdNtagFastEfficientThursday, May 16, 13
  • Partial word index• Where row size will be large•Take one part for key, rest for columns name18CREATE TABLE email_index (domain varchar,user varchar,username varchar,PRIMARY KEY (domain, user));INSERT INTO email_index (domain, user, username)VALUES (@relational.com,tcodd, tcodd);User: tcodd Email: tcodd@relational.comThursday, May 16, 13
  • Partial word index - Super!• Create partitions + partial indexes FTW19CREATE TABLE product_index (store int,part_number0_3 int,part_number4_9 int,count int,PRIMARY KEY ((store,part_number0_3), part_number4_9));INSERT INTO product_index (store,part_number0_3,part_number4_9,count)VALUES (8675309,7079,48575,3);SELECT countFROM product_indexWHERE store = 8675309AND part_number0_3 = 7079AND part_number4_9 = 48575;Compound row key!Fast and efficient!• Store #8675309 has 3 of part# 7079748575Thursday, May 16, 13
  • Bit map index• Multiple parts to a key• Create a truth table of the different combinations• Inserts == the number of combinations- 3 fields? 7 options (Not going to use null choice)- 4 fields? 15 options20Thursday, May 16, 13
  • Bit map index• Find a car in a lot by variable combinations21Make Model Color Combinationx Colorx Modelx x Model+Colorx Makex x Make+Colorx x Make+Modelx x x Make+Model+ColorThursday, May 16, 13
  • Bit map index -Table create• Make a table with three different key combos22CREATE TABLE car_location_index (make varchar,model varchar,color varchar,vehical_id int,lot_id int,PRIMARY KEY ((make,model,color),vehical_id));Compound row key with three different optionsThursday, May 16, 13
  • Bit map index - Adding records• Pre-optimize for 7 possible questions on insert23INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (Ford,Mustang,Blue,1234,8675309);INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (Ford,Mustang,,1234,8675309);INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (Ford,,Blue,1234,8675309);INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (Ford,,,1234,8675309);INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (,Mustang,Blue,1234,8675309);INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (,Mustang,,1234,8675309);INSERT INTO car_location_index (make,model,color,vehical_id,lot_id)VALUES (,,Blue,1234,8675309);Thursday, May 16, 13
  • Bit map index - Selecting records• Different combinations now possible24SELECT vehical_id,lot_idFROM car_location_indexWHERE make = FordAND model = AND color = Blue;vehical_id | lot_id------------+---------1234 | 8675309SELECT vehical_id,lot_idFROM car_location_indexWHERE make = AND model = AND color = Blue;vehical_id | lot_id------------+---------1234 | 86753098765 | 5551212Thursday, May 16, 13
  • Feeling super yet?• Use these skills. Save you they will.• Don’t settle for boring data models• Stay tuned for more!25• Final will be at the Cassandra Summit: June 11thThe worlds next top data modelThursday, May 16, 13
  • Be there!!!26Sony, eBay, Netflix, Intuit, Spotify... the list goes on. Don’t miss it.Here is my discount code! Use it: PMcVIPThursday, May 16, 13
  • Bonus!• DataStax Java Driver Preso - June 12th• Download today!27https://github.com/datastax/java-driverThursday, May 16, 13
  • ThankYouQ&AThursday, May 16, 13