Presenter: Narinder Kumar, VP – Engineering at IntelliGrape IntelliGrape (now TO THE NEW) organized New Delhi Cassandra Users Meetup in November 2014 and had a 1 hour walkthrough session on DataStax Java Driver API. This presentation will arm you with the knowledge and hands-on skills on DataStax Java Driver API including topics like: 1. Driver Options with different languages 2. DataStax Java Driver Highlights 3. Key Features 4. Code Demos 5. Debugging & Testing At the end of the session, we will provide few key takeaways to help the audience while coding with the DataStax Java Driver API. The tutorial includes the driver options with different languages, highlights of the Datastax Java Driver, key features of Datastax Java Driver, code demos of Datastax Java Driver, Debugging and testing of Datastax Java Driver, key points to keep in mind while coding with Driver. The tutorial begins with a section about the driver options which are available in different languages like C#, Java, GO etc. It also includes other open source implementations. Following is a Highlights section. It includes the highlights of the Driver like the most recent version as well as new updates like latency, testability, statements etc. Trailing is a section about key features of Datastax Java Driver. It includes features like asynchronous I/O, Automatic failover, Batch statements, CQL-Java data types conversion. After this, the next section is based on code demos of the Driver. It includes code demos like hello world client, loading & querying data in Cassandra, prepared statement & query builder. Afterward comes the debugging and testing of Datastax Java Driver. It includes debugging of the Driver like enable tracing, configure settings, monitoring and it also includes testing of the Driver like implementing interfaces. The last section of this tutorial talks about the key points to be kept in mind while coding with Driver. It involves key points which a user should keep in mind like one cluster instance per cluster, one session instance per keyspace, considering prepared statement, considering batch operations.

2. DataStax Java
Driver Walkthrough

3. DataStaxJava Driver Walkthrough
At
NewDelhi Cassandra UsersMeetup – November 2014
By: Narinder Kumar

4. 1. Driver Options with different languages
2. DataStax Java Driver Highlights
3. Key Features
a. Asynchronous I/O
b. Automatic Failover
c. Batch Statements
d. CQL – Java Data Types conversion
4. Code Demos
a. Hello WorldClient
b. Loading & Querying Data in Cassandra
c. PreparedStatement & QueryBuilder
5. Debugging &Testing
6. Key Points to keep in mind
Agenda

5. • DataStaxmaintained language driversare available in
– C#
– Java
– Node.js
– Python
– Ruby
– Go
• Other open source implementations also available
Driver Options with different languages

6. • Current version2.1.2
• What’s new
– Parameterized Statements
– Batching prepared Statements
– Automatic Result SetPagination
– Lightweight Transactions
– Latency Aware Policies
– Fewer Dependencies
– Improved Testability
DataStax Java Driver – Highlights

7. • session.execute(Query) ➔ session.executeAsync(Query)
• Returns ResultSet ➔ ResultSetFuture
• ResultSetFuture
– Implements java.util.concurrent.Future<V> interface
Asynchronous I/O

8. • In case of one / multiple Node failure, Java driver automatically
– Tries other nodes
– Schedules reconnections
• Driver behavior is determined by cluster configuration options
Cluster.builder()
.addContactPoints(192.168.1.1, 192.168.1.5,…)
.withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE)
.withReconnectionPolicy(new
ConstantReconnectionPoloicy(100L))
.build();
Automatic Failover

9. • Allows execution of multiple statements in one group
• Works for Simple as well as PreparedStatements
• Can apply timestamp for later queries
• May be used to form mini transaction
Batch Statements

10. CQL Java
ascii String
bigint long
blob Java.nio.ByteBuffer
counter Long
decimal java.math.BigDecimal
CQL to Java

11. Code Demos
ReferGithub repo : https://github.com/narinder-kumar/cassandrasample

12. • Debugging
– Enable Tracing onserver side
• QueryBuilder….enableTracing()
• ResultSet.getExecutionInfo()
– Adjust log4j configurationsettings
– JMX Monitoring
• connectedToHosts(), errorMetrics(), openConnections()
• Testing
– Inlatest release, lot of classes have been implementing
Interfaces. Helps using Mocking frameworks during unit testing
Debugging & Testing

13. • One cluster instance per cluster per application life-time
– Easy Configurability
• One session instance per keyspace
– Expensive object, better shared
• Ifexecuting onestatement multiple times, consider
PreparedStatement
– Faster execution
• Consider BatchOperations
Key points while coding with Driver

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