Cassandra Day Denver 2014: Building Java Applications with Apache Cassandra
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Speaker: 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 Denver 2014: Building Java Applications with Apache Cassandra
- 1. Building Java Applica)ons with Cassandra "VNDGTINWPF
- 2. 2000 4000 6000 8000 E000 C000 A000 0000 Client Machine Load Balancer
- 3. tim name: Tim role: teacher kristen name: Kristen role: marketing billy role: CEO matt name: Matt role: founder status: active status: chill
- 5. DataStax Java Driver • Open source (ASL 2.0) • Where CQL happens • Ac9vely developed • Now faster than ThriD • Doesn’t make you want to die
- 6. Every Use Case has a Story
- 8. Gradle Build 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' }
- 9. Cluster Interface Cluster cluster = Cluster.builder() .addContactPoints(“192.168.50.1”) .build(); Session session = cluster.connect(“IoT_keyspace); session.execute( INSERT INTO sensor (sensor_id, reading, time) VALUES (24601, 2.171828, now())”);
- 11. BasicQueries ResultSet resultSet = session.execute(SELECT * FROM sensor); ListRow rows = resultSet.all(); for(Row row : rows) { String sensorId = row.getString(sensor_id ); double reading = row.getDouble(reading ); Date time = row.getDate(time ); }
- 12. Prepared Statements 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);
- 14. 2000 4000 6000 8000 E000 C000 A000 0000 Client Machine
- 15. Cluster Interface Cluster cluster = Cluster.builder() .addContactPoints(“192.168.50.1”) .build();
- 16. Cluster Interface Cluster cluster = Cluster.builder() .addContactPoints(“192.168.50.1”, “192.168.50.4”, “192.168.50.8”) .build();
- 17. Your Story: ň+ņNNLWUVQRVKOKGEQQTFKPCVQT NQCFVJGPʼn
- 18. 2000 4000 6000 8000 E000 C000 A000 0000 Client Machine
- 19. 2000 4000 6000 8000 E000 C000 A000 0000 Client Machine 1.2ms 2.9ms 15.3ms
- 20. Outsmar(ng Yourself • Pick one node • Send all coordina9on traffic to that node • Hey, maybe make it a fat node! • WhiteListPolicy
- 21. WhiteListing ListInetSocketAddress whiteList = new ArrayListInetSocketAddress(); whiteList.add(...); Cluster c = Cluster.builder().withLoadBalancingPolicy( new WhiteListPolicy( new RoundRobinPolicy(), whiteList)).build();
- 22. Your Story: ň+OKUU,2#ʼn [QWJCXGKUUWGU
- 23. Mapper Object 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' }
- 24. CREATE TABLE sensor ( sensor_id int, reading double, time timestamp ); Mapper Object @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... }
- 25. Mapper Object MappingManager manager = new MappingManager(session); Mapper mapper = manager.mapper(Sensor.class); Sensor reading = mapper.get(24601);
- 27. FutureResults 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(); ListRow rows = resultSet.all();
- 28. FutureResults Executor executor = Executors.newCachedThreadPool(); ResultSetFuture future = session.executeAsync(SELECT * FROM sensor); future.addListener(new Runnable() { public void run() { // Do the things here… } }, executor);
- 29. Your Story: ň6TCPUOKVYKPFQYUJCXGDGGPC VJKPINQPIGTVJCPOQUVFGXGNQRGTU JCXGDGGPCNKXGʼn