DataStax Java Driver Walkthrough

DataStax Java Driver Walkthrough

At

New Delhi Cassandra Users Meetup – November 2014

By: Narinder Kumar

1. Driver Options with different languages2. DataStax Java Driver Highlights3. Key Features

a. Asynchronous I/Ob. Automatic Failoverc. Batch Statementsd. CQL – Java Data Types conversion

4. Code Demosa. Hello World Clientb. Loading & Querying Data in

Cassandrac. PreparedStatement & QueryBuilder

5. Debugging & Testing6. Key Points to keep in mind

Agenda

• DataStax maintained language drivers are available in– C#– Java– Node.js– Python– Ruby– Go

• Other open source implementations also available

Driver Options with different languages

• Current version 2.1.2

• What’s new

– Parameterized Statements

– Batching prepared Statements

– Automatic Result Set Pagination

– Lightweight Transactions

– Latency Aware Policies

– Fewer Dependencies

– Improved Testability

DataStax Java Driver – Highlights

• session.execute(Query) ➔ session.executeAsync(Query)

• Returns ResultSet ➔ ResultSetFuture

• ResultSetFuture

– Implements java.util.concurrent.Future<V> interface

Asynchronous I/O

• In case of one / multiple Node failure, Java driver automatically– Tries other nodes– Schedules reconnections

• Driver behavior is determined by cluster configuration optionsCluster.builder().addContactPoints(192.168.1.1, 192.168.1.5,…).withRetryPolicy(DowngradingConsistencyRetryPolicy.INSTANCE).withReconnectionPolicy(new

ConstantReconnectionPoloicy(100L)).build();

Automatic Failover

• 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

CQL Java

ascii Stringbigint longblob Java.nio.ByteBuffer

counter Longdecimal java.math.BigDecimal

CQL to Java

Code Demos

Refer Github repo : https://github.com/narinder-kumar/cassandrasample

• Debugging– Enable Tracing on server side

• QueryBuilder….enableTracing()• ResultSet.getExecutionInfo()

– Adjust log4j configuration settings– JMX Monitoring

• connectedToHosts(), errorMetrics(), openConnections()

• Testing– In latest release, lot of classes have been implementing

Interfaces. Helps using Mocking frameworks during unit testing

Debugging & Testing

• One cluster instance per cluster per application life-time– Easy Configurability

• One session instance per keyspace– Expensive object, better shared

• If executing one statement multiple times, considerPreparedStatement– Faster execution

• Consider Batch Operations

Key points while coding with Driver

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