C* Summit EU 2013: Cassandra Made Simple with CQL Drivers and DevCenter
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1) The document discusses Cassandra tools including the DataStax CQL drivers and the new DevCenter visual query tool. 2) The CQL drivers provide an asynchronous architecture based on Netty, support prepared statements, automatic failover, and tunable policies. 3) DevCenter is a free visual query tool that can be used by developers and admins for creating and running CQL queries and commands against Apache Cassandra and DataStax Enterprise. It is intended to be a smarter and friendlier alternative to cqlsh.
C* Summit EU 2013: Cassandra Made Simple with CQL Drivers and DevCenter
- 1. #CASSANDRAEU Cassandra made simple with CQL drivers and DevCenter MichaĂŤl Figuiere, Software Engineer, DataStax ! Alex Popescu, Sen.Product Manager, DataStax
- 2. Agenda â˘Why building tools for Cassandra? â˘DataStax Drivers ⢠Core values â˘Introducing DevCenter #CASSANDRAEU
- 3. Motivation ÂŤUse the right tool for the jobÂť ... the best tools for the job #CASSANDRAEU
- 4. Why building tools for C* â˘Too many choices â˘Best practices â˘distributed systems â˘modern applications â˘Friendly, Familiar, Integrated experience #CASSANDRAEU
- 5. One way or another â˘Learn & experiment â˘Implement â˘Test â˘Integrate ! â˘Repeat #CASSANDRAEU
- 6. CQL The new face of Cassandra * CQL * Simpler Data Model using Denormalized Tables * SQL-like Query Language * Schema Definition * CQL Native Protocol * Introduced in Cassandra 1.2 * Designed for CQL * Thrift will keep being supported by Cassandra
- 7. CQL Drivers Overview * Reference Implementation * Asynchronous architecture based on Netty * Prepared Statements Support * Automatic Fail-over * Node Discovery * Cassandra Tracing Support * Tunable Policies !
- 9. Notifications Node Client Node Node With NotiďŹcations Node Client Node Without NotiďŹcations Node
- 12. Connect and Write Cluster cluster = new Cluster.builder() .addContactPoints("10.0.0.1", "10.0.0.2") .build(); ! Session session = cluster.connect("myKeyspace"); ! session.execute( "INSERT INTO user (user_id, name, email) VALUES (12345, 'johndoe', '[email protected]')" );
- 13. Read from a table ResultSet rs = session.execute("SELECT * FROM test"); ! List<Row> rows = rs.all(); for (Row row : rows) { ! String userId = row.getString("user_id"); String name = row.getString("name"); String email = row.getString("email"); }
- 14. Asynchronous Read ResultSetFuture future = session.executeAsync("SELECT * FROM test"); ! for (Row row : future.get()) { ! String userId = row.getString("user_id"); String name = row.getString("name"); String email = row.getString("email"); }
- 15. Read with Callbacks final ResultSetFuture future = session.executeAsync("SELECT * FROM test"); ! future.addListener(new Runnable() { public run() { for (Row row : future.get()) { ! String userId = row.getString("user_id"); String name = row.getString("name"); String email = row.getString("email"); } } }, executor);
- 16. Using Prepared Statements public void setUserByPreparedStatement(User user) {! ! BoundStatement bs = setUser.bind();! ! bs.setString("username", user.getUsername());! bs.setString("firstname", user.getFirstname());! bs.setString("lastname", user.getLastname());! bs.setString("email", user.getEmail());! bs.setDate("created_date", user.getCreated_date());! ! ! ! session.execute(bs); ! }
- 17. Using the Query Builder Query query = select().all().from("videodb", "videos")! .where(eq("videoId", videoId)).limit(10);! ! query.setConsistencyLevel(ConsistencyLevel.ONE);! ! ResultSet rs = session.execute(query);!
- 18. Load Balancing and Failover Respons e 5 Retry Policy 4 6 Client 1 Load Balancing Policy 3 Node Node 2 Node Health Monitor NotiďŹcations Reconnection
- 19. Multi Datacenter Load Balancing Datacenter A Client Node Client Node Client Node Client Node Client Client Node Node Datacenter B Local nodes are queried ďŹrst, if non are available, the request will be sent to a remote node.
- 20. Token Aware Load Balancing Replic Node a Node Replic Node Client a Node Replic a Node Nodes that own a Replica of the data being read or written by the query will be contacted ďŹrst.
- 21. Add a Load Balancing Policy ! ! cluster = Cluster.builder()! .addContactPoints("10.0.0.1", "10.0.0.2") .withLoadBalancingPolicy(Policies.defaultLoadBalancingPolicy())! .build();! ! session = cluster.connect(keyspace);! Create your own policy!
- 22. Automatic Paging Nod Query Client Page 1 + Paging State 1 Repli Nod Repli Nod Repli
- 23. Automatic Paging Nod Repli Query + Paging State 1 Client Nod Repli Page 2 + Paging State 2 Nod Repli
- 25. DevCenter #CASSANDRAEU â˘DevCenter is a free visual query tool that can be used by both developers and admins for creating and running CQL queries and commands against Apache Cassandra and DataStax Enterprise â˘DevCenter is the smarter and friendlier brother of cqlsh
- 26. DevCenter #CASSANDRAEU Pull a Steve Jobs... ... brag about how brilliant DevCenter is