Cassandra Day Chicago 2015: Building Java Applications with Apache Cassandra
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Speaker(s): Tim Berglund, Global Director of Training at DataStax So you’re a JVM developer, you understand Cassandra’s architecture, and you’re on your way to knowing its data model well enough to build descriptive data models that perform well. What you need now is to know the Java Driver. What seems like an inconsequential library that proxies your application’s queries to your Cassandra cluster is actually a sophisticated piece of code that solves a lot of problems for you that early Cassandra developers had to code by hand. Come to this session to see features you might be missing and examples of how to use the Java driver in real applications.
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Cassandra Day Chicago 2015: Building Java Applications with Apache Cassandra
- 2. Treat Cassandra Like a Database
- 3. An Awesome Database • Always on • Horizontally scalable • Mul5ple data centers • Cloud/hybrid • Web/mobile/IoT
- 6. CREATE TABLE product_browsing_data (product_id uuid, user_id uuid, clicked_at timestamp, serialized_browsing_data text, PRIMARY KEY (product_id, user_id, clicked_at) );
- 8. DataStax Java Driver • Open source (ASL 2.0) • Where CQL happens • Ac5vely developed • Now faster than ThriK • Doesn’t make you want to die
- 9. Every Use Case has a Story
- 10. Your Story:
- 11. apply plugin: 'java' repositories { jcenter() } dependencies { compile 'com.datastax.cassandra:cassandra-driver-core:2.1.2' testCompile 'org.testng:testng:6.8.8' testCompile 'junit:junit:4.11' } Gradle Build
- 12. session.execute( "INSERT INTO sensor (sensor_id, reading, time) VALUES (24601, 2.171828, now())”); Cluster Interface Cluster cluster = Cluster.builder() .addContactPoints(“192.168.50.1”) .build(); Session session = cluster.connect(“IoT_keyspace");
- 13. Your Story:
- 14. ResultSet resultSet = session.execute("SELECT * FROM sensor"); List<Row> rows = resultSet.all(); for(Row row : rows) { String sensorId = row.getString("sensor_id" ); double reading = row.getDouble("reading" ); Date time = row.getDate("time" ); } Basic Queries
- 15. PreparedStatement insertReading = session.prepare( "INSERT INTO sensor (sensor_id, reading, time) VALUES (?, ?, ?)” ); Statement statement = insertReading .bind(24601, 2.71828, new Date()) .setConsistencyLevel(ConsistencyLevel.QUORUM); session.execute(statement); Prepared Statements
- 16. Your Story:
- 18. Cluster Interface Cluster cluster = Cluster.builder() .addContactPoints(“192.168.50.1”) .build();
- 19. Cluster Interface Cluster cluster = Cluster.builder() .addContactPoints(“192.168.50.1”, “192.168.50.4”, “192.168.50.8”) .build();
- 20. Your Story:
- 23. Outsmar)ng Yourself • Pick one node • Send all coordina5on traffic to that node • Hey, maybe make it a fat node! • WhiteListPolicy • PLEASE DO NOT DO THIS
- 24. List<InetSocketAddress> whiteList = new ArrayList<InetSocketAddress>(); whiteList.add(...); Cluster c = Cluster.builder().withLoadBalancingPolicy( new WhiteListPolicy( new RoundRobinPolicy(), whiteList)).build(); White Listing
- 25. Your Story:
- 26. apply plugin: 'java' repositories { jcenter() } dependencies { compile 'com.datastax.cassandra:cassandra-driver-core:2.1.2' compile 'com.datastax.cassandra:cassandra-driver-mapping:2.1.2' testCompile 'org.testng:testng:6.8.8' testCompile 'junit:junit:4.11' } MapperObject
- 27. CREATE TABLE sensor ( sensor_id int, reading double, time timestamp ); MapperObject @UDT(keyspace = "IoT_keyspace", name = "sensor") public class Sensor { private int sensorId; private double reading; private Date Time; // getters and setters elided with extreme prejudice... }
- 28. MapperObject MappingManager manager = new MappingManager(session); Mapper mapper = manager.mapper(Sensor.class); Sensor reading = mapper.get("24601");
- 29. Your Story:
- 30. ResultSetFuture future = session.executeAsync("SELECT * FROM sensor"); // Returns immediately // Go do productive things here… // Then finally block on the results when you must ResultSet futureResults = future.get(); List<Row> rows = resultSet.all(); Future Results
- 31. Executor executor = Executors.newCachedThreadPool(); ResultSetFuture future = session.executeAsync("SELECT * FROM sensor"); future.addListener(new Runnable() { public void run() { // Do the things here… } }, executor); Future Results
- 32. Your Story:
- 34. Thank You!