Workshop desarrollo Cassandra con el driver Java

1. Workshop
desarrollo Cassandra
Java
José Hernández
Isthari
jose.Hernandez@isthari.com

2. Dependencias
 Maven
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
<version>2.0.1</version>
</dependency>

3. Cluster de cassandra

4. Conexión
 Cluster
Cluster cluster = Cluster.builder()
.addContactPoint(“10.202.203.105")
.addContactPoint(“10.202.203.106")
.build();

5. Conexión
 Cluster
Cluster cluster = Cluster.builder()
.addContactPoint(“10.202.203.105")
.addContactPoint(“10.202.203.106")
.build();
 Auto – discover
New Cassandra host /10.202.203.108
New Cassandra host /10.202.203.109
New Cassandra host /10.202.203.111
…

6. Desconexión
 Cluster
Cluster cluster = Cluster.builder()
.addContactPoint(“10.202.203.105")
.addContactPoint(“10.202.203.106")
.build();
 Desconectar
Cluster.close();

7. Statements
 Conectar a un keyspace
Session session = cluster.connect("webinar");

8. Statements
 Conectar a un keyspace
Session session = cluster.connect("webinar");
 DDL
session.execute("create table usuarios
( id uuid , nombre text, primary key (id)) ");

9. Statements
 Conectar a un keyspace
Session session = cluster.connect("webinar");
 DDL
session.execute("create table usuarios
( id uuid , nombre text, primary key (id)) ");
 DML
session.execute("insert into usuarios (id, nombre)
values (18c8dfee-…, 'Juan')");

10. Query
ResultSet resultSet = session.execute("select * from usuarios");

11. Query
ResultSet resultSet = session.execute("select * from usuarios");
for (Row row : resultSet){
…
}

12. Query
ResultSet resultSet = session.execute("select * from usuarios");
for (Row row : resultSet){
LOGGER.info(row.getUUID("id")+" - "+
row.getString("nombre"));
}

13. Bound statement
PreparedStatement stmt = session.prepare(
"insert into usuarios (id, nombre) values (?,?)");

14. Bound statement
PreparedStatement stmt = session.prepare(
"insert into usuarios (id, nombre) values (?,?)");
session.execute(
stmt.bind(UUID.randomUUID(), "Jose"));

15. Async queries

16. Async queries

17. Async queries
ResultSetFuture resultSet1 = session.executeAsync("select …
ResultSetFuture resultSet2 = session.executeAsync("select …
ResultSetFuture resultSet3 = session.executeAsync("select …

18. Async queries
ResultSetFuture resultSet1 = session.executeAsync("select …
ResultSetFuture resultSet2 = session.executeAsync("select …
ResultSetFuture resultSet3 = session.executeAsync("select …
for (Row row : resultSet1.getUninterruptibly()){
...
}

19. Async queries
ResultSetFuture resultSet1 = session.executeAsync("select …
ResultSetFuture resultSet2 = session.executeAsync("select …
ResultSetFuture resultSet3 = session.executeAsync("select …
for (Row row : resultSet1.getUninterruptibly()){
...
}
for (Row row : resultSet2
.getUninterruptibly(1000, TimeUnit.MILLISECONDS)){
...
}

20. Query builder
Statement stmt1 = QueryBuilder
.select()

21. Query builder
Statement stmt1 = QueryBuilder
.select()
.from("usuarios")

22. Query builder
Statement stmt1 = QueryBuilder
.select()
.from("usuarios")
.where(eq("id", UUID.fromString("0bd4f5c9…")));

23. Query builder
Statement stmt1 = QueryBuilder
.select()
.from("usuarios")
.where(eq("id", UUID.fromString("0bd4f5c9…")));
session.execute(stmt1);

24. Query builder
Statement stmt = QueryBuilder.insertInto(“usuarios")

25. Query builder
Statement stmt = QueryBuilder.insertInto(“usuarios")
.value("id", UUID.randomUUID())
.value(“nombre", “Felipe")

26. Query builder
Statement stmt = QueryBuilder.insertInto(“usuarios")
.value("id", UUID.randomUUID())
.value(“nombre", “Felipe")
.setConsistencyLevel(ConsistencyLevel.ANY)

27. Query builder
Statement stmt = QueryBuilder.insertInto(“usuarios")
.value("id", UUID.randomUUID())
.value(“nombre", “Felipe")
.setConsistencyLevel(ConsistencyLevel.ANY);
session.execute(stmt);

28. Tracing
stmt.enableTracing();
ExecutionInfo info = session.execute(stmt).getExecutionInfo();
QueryTrace trace = info.getQueryTrace ();

29. Load balancing policy
 RoundRobinPolicy
 DCAwareRoundRobinPolicy
 TokenAware

30. Load balancing policy
 RoundRobinPolicy
 DCAwareRoundRobinPolicy
 TokenAware
Ejemplo: DCAwareRoundRobinPolicy
Cluster cluster = Cluster.builder()
…
.withLoadBalancingPolicy(
new DCAwareRoundRobinPolicy("localDC"))

31. Preguntas y sugerencias
Gracias por asistir