The document discusses PHP and Cassandra. It provides an introduction to Cassandra including what it is, where it came from, and its key advantages. It then discusses how to model data in Cassandra and provides examples of creating a keyspace and column family. The document also discusses different PHP libraries for interacting with Cassandra like PHPCassa and using Thrift directly. It provides examples of basic operations like insert, select, delete and more using these different PHP libraries.

1. PHP e CASSANDRA

2. Ivan Rosolen
Graduado em Sistemas de Informação
Pós-graduado em Gerência de Projetos
Desenvolvedor a 10+ anos
Autor de vários PHPT (testes para o PHP)
Gerente de Projetos na
Arizona

3. CASSANDRA

4. O que? De onde? Quem?

5. NoSQL
Amazon Dynamo
Google Big Table
Facebook

6. Pontos Positivos

7. - Alta escalabilidade e disponibilidade
- Sem um único ponto de falha
- Baseado em colunas (wide-column)
- Rendimento de escrita muito alto
- Rendimento de leitura bom
- Consistência ajustável e suporte a replicação

8. Colunas

9. - Modelar os dados do jeito que você vai buscar, desnormalizado
[KeySpace][ColumnFamily][Key][SuperColumn][SubColumn]

10. Database = [KeySpace]
Tabela
= [ColumnFamily]
Linha
= [Key]
Valores = [Column][SuperColumn][SubColumn]

11. Keyspace 1
Column Family 1
RowKey 1
Name
Value
Timestamp
Name
Value
Timestamp
Name
Value
Timestamp
RowKey 2
Name
Value
Timestamp
Name
Value
Timestamp
Name
Value
Timestamp

12. Cases

13. NoSQL at Netflix
http://goo.gl/dtkRw1

14. 2011 Cassandra SF: Cassandra at Twitter Presentation
http://goo.gl/Z6akmx

15. C* Summit 2013: Cassandra at Instagram
http://goo.gl/UtCMH9

16. Mais...
http://www.planetcassandra.org/Company/ViewCompany

17. Devo Usar?

18. - Algum outro NoSQL não aguentou (MongoDB)
- Precisa de um modelo de dados mais rebuscado?
- Precisa de uma escrita ABSURDA?
- Está disposto a reformular sua aplicação?
As vezes muito trabalhoso dependendo da arquitetura
- Está disposto a gastar $$?

19. PHP

20. Dependências

21. Cassandra
http://cassandra.apache.org

22. - Não recomendado usar o java 7 ou o OpenJDK
- Oracle Java SE Runtime Environment (JRE) 6
- Apache disponibiliza “binary tarballs” e “Debian
packages”
- Java Native Access (JNA) é necessário para
servidores de produção pois melhora a utilização
de memória do Cassandra

23. - Cassandra-Cli
- CQL - Cassandra Query Language
http://cassandra.apache.org/doc/cql/CQL.html

24. Criando

25. cassandra-cli
create keyspace Palestra
with placement_strategy = 'org.apache.cassandra.locator.SimpleStrategy'
and strategy_options = {replication_factor:1};
use Palestra;
create column family Users;
cqlsh
cqlsh:demo> select * from “Users”;

26. Thrift
http://thrift.apache.org

27. - Habilitar APC para melhor performace
- Dependências / Install
http://thrift.apache.org/docs/install/
- Módulo nativo do PHP (phpize)
cd ext/thrift_protocol
phpize
./configure
make
sudo make install

28. PHPCassa

29. - Compatível com Cassandra 0.7 até 1.2
- PHP 5.3+
- CQL 2.0

30. Links
https://github.com/thobbs/phpcassa
https://groups.google.com/forum/#!forum/phpcassa
http://thobbs.github.io/phpcassa/
http://itsallabtamil.blogspot.com.br/2012/03/cassandra-phpcassa-composite-types.html
http://www.fuzzy.cz/en/articles/php-and-cassandra-twissandra/

31. Criando

32. <?php
require_once(__DIR__.'/../lib/autoload.php');
use phpcassaConnectionConnectionPool;
use phpcassaColumnFamily;
use phpcassaSystemManager;
use phpcassaSchemaStrategyClass;
$sys = new SystemManager('127.0.0.1');
$sys->create_keyspace('Palestra', array(
"strategy_class" => StrategyClass::SIMPLE_STRATEGY,
"strategy_options" => array('replication_factor' => '1')));
$sys->create_column_family('Palestra', 'Users');
$sys->close();

33. Sem PHPCassa

34. <?php
$GLOBALS['THRIFT_ROOT'] = '/usr/share/php/Thrift';
require_once $GLOBALS['THRIFT_ROOT'].'/packages/cassandra/Cassandra.php';
require_once $GLOBALS['THRIFT_ROOT'].'/packages/cassandra/cassandra_types.php';
require_once $GLOBALS['THRIFT_ROOT'].'/transport/TSocket.php';
require_once $GLOBALS['THRIFT_ROOT'].'/protocol/TBinaryProtocol.php';
require_once $GLOBALS['THRIFT_ROOT'].'/transport/TFramedTransport.php';
require_once $GLOBALS['THRIFT_ROOT'].'/transport/TBufferedTransport.php';

35. try {
$socket = new TSocket('127.0.0.1', 9160);
$transport = new TBufferedTransport($socket, 1024, 1024);
$protocol = new TBinaryProtocolAccelerated($transport);
$client = new CassandraClient($protocol);
$transport->open();
$keyspace = 'Palestra';
$keyUserId = "user0";
$columnPath = new cassandra_ColumnPath();
$columnPath->column_family = 'Users';
$columnPath->super_column = null;
$columnPath->column = 'email';
$timestamp = time();
$consistency_level = cassandra_ConsistencyLevel::ZERO;
$value = 'user@email.com';
$client->insert($keyspace, $keyUserId, $columnPath, $value, $timestamp, $consistency_level);
$transport->close();
} catch (TException $tx) {
print 'TException: '.$tx->why. ' Error: '.$tx->getMessage() . "n";
}

36. Com PHPCassa

37. <?php
require_once(__DIR__.'/../lib/autoload.php');
use phpcassaConnectionConnectionPool;
use phpcassaColumnFamily;
$pool = new ConnectionPool('Palestra', array('127.0.0.1'));
$users = new ColumnFamily($pool, 'Users');
$users->insert('user0', array("email" => "user@email.com"));
$pool->close();

38. <?php
require_once(__DIR__.'/../lib/autoload.php');
use phpcassaConnectionConnectionPool;
$servers = array(“192.168.229.170:9160”,”192.168.229.171:9160”,”192.168.229.172:9160);
$pool
= new ConnectionPool ('Palestra',$servers);
$pool->close();

39. $sys = new SystemManager('127.0.0.1');
$pool = new ConnectionPool('Palestra', array('127.0.0.1'));
$users = new ColumnFamily($pool, 'Users');
$users->truncate();
$sys->drop_keyspace("Palestra");
$pool->close();
$sys->close();

40. Insert e Batch Insert

41. $users->insert('user0', array("name" => "ivan", "state" => "SP"));
$users->insert('user1', array("name" => "elton", "state" => "SC"));
$users->batch_insert(array("user3" => array("name" => "er"),
vvvvvvvvvvv"user4" => array("name" => "calvin")));

42. Select e Multi Select

43. $user = $users->get('user0');
$name = $user["name"];
echo "Nome do usuário $namen";
$columnNames = array('name', 'state');
$user = $users->get('user0',$column_slice = null, $column_names=$columnNames);

44. $many = $users->multiget(array('user0', 'user1'));
foreach($many as $user_id => $columns) {
echo "Estado do $user_id: ".$columns["state"]."n";
}
$users->get_count('user0');
// retorna 2

45. Where e Limit

46. <?php
require_once(__DIR__.'/../lib/autoload.php');
use phpcassaConnectionConnectionPool;
use phpcassaColumnFamily;
use phpcassaColumnSlice;
$pool = new ConnectionPool('Palestra', array('127.0.0.1'));
$letters = new ColumnFamily($pool, 'Letras');
$columns = array(1 => "a", 2 => "b", 3 => "c", 4 => "d", 5 => "e");
$letters->insert('linha', $columns);
…….
$pool->close();

47. // Where >= 2
$slice = new ColumnSlice(2);
print_slice($letters->get('linha', $slice));
// Between 2 and 4
$slice = new ColumnSlice(2, 4);
print_slice($letters->get('linha', $slice));
// Limit 3
$slice = new ColumnSlice('', '', $count=3);
print_slice($letters->get('linha', $slice));
// 3 últimas
$slice = new ColumnSlice('', '', $count=3, $reversed=true);
print_slice($letters->get('linha', $slice));
// 2 últimas antes do 4
$slice = new ColumnSlice(4, '', $count=2, $reversed=true);
print_slice($letters->get('linha', $slice));

48. Delete

49. <?php
require_once(__DIR__.'/../lib/autoload.php');
use phpcassaConnectionConnectionPool;
use phpcassaColumnFamily;
$pool = new ConnectionPool('Palestra', array('127.0.0.1'));
$users = new ColumnFamily($pool, 'Users');
$users->remove("user4");
$users>remove("user0", array("state"));
$users->truncate();
$pool->close();

50. Referências / Links

51. Planet Cassandra
http://www.planetcassandra.org/
Cassandra Summit 2013
http://www.youtube.com/watch?v=Qz6ElTdYjjU&list=PLqcm6qE9lgKJzVvwHprow9h7KMpb5hcUU
Using Cassandra with PHP
https://pressflow.atlassian.net/wiki/display/PF/Using+Cassandra+with+PHP
DataStax
http://www.datastax.com/docs
DataStax Data modeling
http://www.datastax.com/documentation/cql/3.0/webhelp/index.html#cql/ddl/ddl_anatomy_table_c.html
Apache Cassandra Wiki
http://wiki.apache.org/cassandra/ArticlesAndPresentations
Quadrinho de como o Cassandra Funciona
http://blogs.atlassian.com/2013/09/do-you-know-cassandra
Pandra
https://github.com/mjpearson/Pandra
Cassandra PHP Client Library
https://github.com/kallaspriit/Cassandra-PHP-Client-Library/
Cassandra PDO
https://github.com/Orange-OpenSource/YACassandraPDO