O que é preciso para instalar e utilizar Cassandra (NoSQL) com PHP de uma forma simples e direta

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