Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Introduction to RethinkDB : Hack Reactor
Search
Jorge Silva
June 05, 2015
Programming
4
410
Introduction to RethinkDB : Hack Reactor
Jorge Silva
June 05, 2015
Tweet
Share
More Decks by Jorge Silva
See All by Jorge Silva
Introduction to RethinkDB : Move fast and break things
thejsj
2
270
ForwardJS - RethinkDB - Getting Started
thejsj
0
200
ForwardJS - RethinkDB - Advanced Queries
thejsj
1
210
Automatic Failover in RethinkDB
thejsj
0
230
Workshop: Introduction to RethinkDB : Santa Cruz JS
thejsj
1
120
Push databases: A better way to build realtime apps
thejsj
0
130
Data Modeling in RethinkDB
thejsj
4
280
RethinkDB+Angular.js: Building realtime web applications
thejsj
10
30k
Introduction to RethinkDB: 1KE Meetup
thejsj
0
54
Other Decks in Programming
See All in Programming
エンジニアとして高みを目指す、 利益を生み出す設計の考え方 / design-for-profit
minodriven
23
12k
Building, Deploying, and Monitoring Ruby Web Applications with Falcon (Kaigi on Rails 2025)
ioquatix
3
1k
止められない医療アプリ、そっと Swift 6 へ
medley
1
130
Conquering Massive Traffic Spikes in Ruby Applications with Pitchfork
riseshia
0
150
ソフトウェア設計の実践的な考え方
masuda220
PRO
3
500
CSC509 Lecture 01
javiergs
PRO
1
430
CSC509 Lecture 05
javiergs
PRO
0
300
フロントエンド開発に役立つクライアントプログラム共通のノウハウ / Universal client-side programming best practices for frontend development
nrslib
7
3.9k
Le côté obscur des IA génératives
pascallemerrer
0
130
iOSエンジニア向けの英語学習アプリを作る!
yukawashouhei
0
180
The Flutter Journey of Building a Live Streaming App — With a Side of Performance Tuning
u503
1
100
実践AIチャットボットUI実装入門
syumai
7
2.5k
Featured
See All Featured
Code Review Best Practice
trishagee
72
19k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
34
6.1k
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Writing Fast Ruby
sferik
629
62k
Raft: Consensus for Rubyists
vanstee
139
7.1k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Distributed Sagas: A Protocol for Coordinating Microservices
caitiem20
333
22k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
A Tale of Four Properties
chriscoyier
160
23k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.5k
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
31
9.7k
jQuery: Nuts, Bolts and Bling
dougneiner
64
7.9k
Transcript
RethinkDB The database for the realtime web Hack Reactor San
Francisco, CA June 4, 2015
Jorge Silva @thejsj Developer Evangelist @ RethinkDB
Introduction What is RethinkDB?
What is RethinkDB? • Open source database for building realtime
web applications • NoSQL database that stores schemaless JSON documents • Distributed database that is easy to scale
Built for Realtime Apps • Subscribe to change notifications from
database queries • No more polling — the database pushes changes to your app • Reduce the amount of plumbing needed to stream live updates
RethinkDB Structure Database → Table → Document MySQL: Database →
Table → Row MongoDB: Database → Collection → Document
Sample Document { "name": "Will Riker", "position": "Commander", "height": 193,
"birthdate": Mon Aug 19 2335, "ships": [ { "name": "USS Pegasus" }, { "name": "USS Potemkin" }, { "name": "USS Enterprise" }, ], ... }
Differences with Firebase • Firebase is a cloud service, not
an open-source database • Because Firebase is not a database, it has limited querying abilities • Firebase is made to be queried from the browser
Differences with MongoDB • RethinkDB supports joins and subqueries •
MongoDB has a traditional query- response model. You can't subscribe to queries.
Introduction to ReQL RethinkDB Query Language
Introduction to ReQL • ReQL embeds natively into your programming
language • Compose ReQL queries by chaining commands
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Number of
unique last names
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Access a
database table
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Isolate a
document property
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Consolidate duplicate
values
Anatomy of a ReQL Query r.table("users") .pluck("last_name") .distinct().count() Display the
number of items
Sample ReQL Queries r.table("users") .filter(r.row("age").gt(30)) r.table(“post") .eqJoin(“uId”, r.table(“users”)) .zip() r.table("fellowship")
.filter({species: "hobbit"}) .update({species: "halfling"})
ReQL Commands • Transformations: map, orderBy, skip, limit, slice •
Aggregations: group, reduce, count, sum, avg, min, max, distinct, contains • Documents: row, pluck, without, merge, append, difference, keys, hasFields, spliceAt • Writing: insert, update, replace, delete
Running Queries http://github.com/thejsj/rethinkdb-quickstart
http://rethinkdb-chat.thejsj.com:10001/ Running Queries
Understanding ReQL • Client driver translates ReQL queries into wire
protocol • Anonymous function must return a valid ReQL expression • In JS use e.g. the mul and gt commands instead of the normal operators
Additional ReQL Features • Geospatial indexing for location- based queries
• Date and time functions for time data • Support for storing binary objects • Execute http requests using r.http
Realtime Updates Working with Changefeeds
Subscribe to change notifications on database queries Changefeeds
r.table("users").changes() Track changes on the users table Changefeeds
Changefeeds • The changes command returns a cursor that receives
updates • Each update includes the new and old value of the modified record
Changefeeds r.table("users").changes() r.table("users") .insert({name: "Bob"}) Changefeed output: { new_val: {
id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob', ... }, old_val: null }
Changefeeds r.table("users").changes() r.table("users") .filter({name: "Bob"}).delete() Changefeed output: { new_val: null,
old_val: { id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob', ... } }
Changefeeds r.table("users").changes() r.table("users") .get("362ae837-2e29-4695-adef-4fa415138f90") .update({name: "Bobby"}) Changefeed output: { new_val:
{ id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bobby' }, old_val: { id: '362ae837-2e29-4695-adef-4fa415138f90', name: 'Bob' } }
Changefeeds r.table("players") .orderBy({index: r.desc("score")}) .limit(3).changes() Track top three players by
score Chain the changes command to an actual ReQL query:
Changefeeds r.table("table").get(ID).changes() r.table("table").getAll(ID).changes() r.table("table").between(X, Y).changes() r.table("table").filter(CONDITION).changes() r.table("table").union(ID).changes() r.table("table").map(FUNCTION).changes() r.table("table").min(INDEX).changes() r.table("table").max(INDEX).changes()
r.table("table").orderBy(INDEX) .limit(N).changes() Commands that currently work with changefeeds:
Using Changefeeds http://github.com/thejsj/rethinkdb-quickstart
http://realtime-photo.thejsj.com/ Sample Application
Cluster Configuration Sharding and replication
Sharding and Replication • RethinkDB is designed for clustering and
easy scalability • To add a new server to the cluster, just launch it with the join option • Configure sharding and replication per table • Any feature that works with a single database will work in a sharded cluster
Add a Server to a Cluster $ rethinkdb --join server:29015
>
Clustering
Additional Resources • RethinkDB website: http://rethinkdb.com • RethinkDB cookbook: http://rethinkdb.com/docs/cookbook
• RethinkDB installation: http://rethinkdb.com/docs/install/
Questions?