DataStax Java Driver Best Practices Example

This example is a companion to the Best Practices for the DataStax Java Driver document.

Editing the Config

You will need to edit the src/main/resources/applications.conf file with the contact points for your cluster. The parameter basic.contact-points default to 127.0.0.1:9042 and localhost:9042 (yes, that is redundant, but was done to illustrate how to specify multiple contact points).

You will also need to set the local data center. The default is dc1. If you need to change that, you will need to change the value of basic.load-balancing-policy.local-datacenter in src/main/resources/application.conf. In addition, you will need to edit the SampleApplication.java on the line where we set the dc variable (line 13).

If you would like to rename the keyspace and/or table name for this example, you can edit the assignment of the ks and/or tbl variables (on lines 14 and 15).

If your cluster requires a username and password, uncomment the line that reads:

.withAuthCredentials("cass_user", "choose_a_better_password")

and supply the username and password in the withAuthCredentials() call.

Building

To build, run

mvn clean package

This will build the source into an executable jar including all its dependencies located at

./target/ex_bestpractices-0.1-SNAPSHOT.jar

Running

To run this sample application, run:

java -jar target/ex_bestpractices-0.1-SNAPSHOT.jar

You should see output like the following:

cmdpromt$ java -jar ./target/ex_bestpractices-0.1-SNAPSHOT.jar
pkey: 10, x: 20
pkey: 1, x: 2
pkey: 100, x: 0
pkey: 10000, x: 20000
pkey: 1000, x: 2000
cmdpromt$