Introduction to terrastore

Introduction to Terrastore Sven Johansson Mejsla @svjson Mats Henricson Crisp @matshenricson

NoSQL - A loosely defined movement - A complement to relational databases - Usually schema-less - Typically not concerned with transactions, locks or data integrity... - ...but more so with performance and scalability

Document-oriented databases - Advanced Key/Value stores - Documents are nested data structures – JSON or JSON-variants - Examples of implementations:
CouchDB (ERLANG)
MongoDB (C++)
RavenDB (C#)
Terrastore (Java)

Terrastore - Open source project founded in Sept-Oct 2009 - Written entirely in Java - Based on Terracotta - Offers per-document consistency - Distributed - Elastic - Scalable at the computational level - Extensible

A Terrastore document { 'name' : 'Sven Johansson', 'age' : '29', 'titles' : [ 'Developer', 'Consultant', 'Destroyer of worlds', ], 'currentlyReading : { title: 'The book of Dave' author: 'Will Self' } 'favouriteBooks' : [{ title: 'The naked and the dead', author: 'Norman Mailer' }, { title: 'On the road', author: 'Jack Kerouac' }] }

public class Person { private String name; private int age; private String[] titles; private Book currentlyReading; private List<Book> favouriteBooks; ... } ...and a corresponding Java Object

Deployment architecture Single cluster - 1 Master - n Servers ( n hot standbys)

Deployment architecture Multi-cluster (Ensemble) - Cluster of n Masters - n Servers each

CRUD with Terrastore Mats Henricson Crisp AB Stockholm 2010-09-14, WTFPL license

Example public class Customer { private String name; private Address address; private List<PhoneNumber> phoneNumbers = new LinkedList<PhoneNumber>(); // ... } public class Address { private String street; // ... } public class PhoneNumber { private String number; private String type; // … } } Stockholm 2010-09-14, WTFPL license

Annotations? Base classes? Nope. The POJO:s are plain vanilla vanilla POJO:s Stockholm 2010-09-14, WTFPL license

You store your domain objects into different buckets. Examples: Buckets are identified by string names, such as "customers", "items", "orders". Buckets are comparable to RDBMS tables, but with no schema! If you need to link objects in different buckets, Then you have to use domain unique IDs. Buckets
One bucket for customer data
One bucket for item data
One bucket for orders
Stockholm 2010-09-14, WTFPL license

First we need a terrastore client That localhost URL points to a terrastore server . If that server goes down, then your client is toast. Next version of the API have implemented fallbacks. Enough! I want an example, now! TerrastoreClient client = new TerrastoreClient("http://localhost:8080", new HTTPConnectionFactory()); Stockholm 2010-09-14, WTFPL license

Customer lindex = new Customer("Lindex"); Address dg = new Address("Drottninggatan 77"); PhoneNumber work = new PhoneNumber("1234567", "work"); PhoneNumber home = new PhoneNumber("2345678", "home"); // Set relationships lindex.setAddress(dg); lindex.addPhoneNumber(work); lindex.addPhoneNumber(home); Now lets create the POJO:s Stockholm 2010-09-14, WTFPL license

BucketOperation customers = client.bucket("customers"); // Create: customers.key("lindex").put(lindex); // Read: Customer l = customers.key("lindex").get(Customer.class); // Important: l != lindex // Delete: customers.key("lindex").remove(); Create, Read and Delete You can update a document with another put() Stockholm 2010-09-14, WTFPL license

So, are we done?
It is safe to remove() non-existing documents
Get for non-existing keys will throw KeyNotFoundException
You can import and export whole buckets to file for backup
You can get all documents in a bucket
You can get n documents in a bucket
You can get all documents within a key range
You can read old documents into objects of updated classes
No, there is a lot more cool stuff! Stockholm 2010-09-14, WTFPL license

Search example with ranges Map<String, Customer> customers = customersBucket.range("lexical-asc") .from("brothers").to("lindex") .limit(10).get(Customer.class); Stockholm 2010-09-14, WTFPL license

String xpath = "jxpath:/address/street[.='Drottninggatan 77']"; Map<String, Customer> dgCustomers = customersBucket.predicate(xpath).get(Customer.class); assertTrue(dgCustomers.containsValue(lindex)); XPath! Internally using JXPath. Stockholm 2010-09-14, WTFPL license

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Introduction to terrastore

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