Examples of com.datastax.driver.core.policies.RoundRobinPolicy

Package com.datastax.driver.core.policies

Examples of com.datastax.driver.core.policies.RoundRobinPolicy

com.datastax.driver.core.policies.RoundRobinPolicy
A Round-robin load balancing policy.
This policy queries nodes in a round-robin fashion. For a given query, if an host fail, the next one (following the round-robin order) is tried, until all hosts have been tried.
This policy is not datacenter aware and will include every known Cassandra host in its round robin algorithm. If you use multiple datacenter this will be inefficient and you will want to use the {@link DCAwareRoundRobinPolicy} load balancing policy instead.

    CountingPolicy policy;
    CCMBridge.CCMCluster c;


    @BeforeClass(groups = "short")
    private void setup() {
        policy = new CountingPolicy(new RoundRobinPolicy());
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(policy);
        c = CCMBridge.buildCluster(2, builder);
    }

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    public void should_refresh_single_connected_host() {
        CCMBridge ccm = null;
        Cluster cluster = null;
        try {
            // This will make the driver use at most 2 hosts, the others will be ignored
            LimitingLoadBalancingPolicy loadBalancingPolicy = new LimitingLoadBalancingPolicy(new RoundRobinPolicy(), 2, 1);


            // Setup a 3-host cluster, start only two hosts so that we know in advance which ones the policy will use
            ccm = CCMBridge.create("test");
            ccm.populate(3);
            ccm.start(1);

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public class LoadBalancingPolicyTest extends AbstractPoliciesTest {


    @Test(groups = "long")
    public void roundRobinTest() throws Throwable {


        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new RoundRobinPolicy());
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(2, builder);
        try {


            createSchema(c.session);
            init(c, 12);

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    @Test(groups = "long")
    public void whiteListPolicyTest() throws Throwable {


        List<InetSocketAddress> whiteList = Arrays.asList(new InetSocketAddress(InetAddress.getByName(CCMBridge.IP_PREFIX + '2'), 9042));


        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new WhiteListPolicy(new RoundRobinPolicy(), whiteList));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session);
            init(c, 12);

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    }


    @Test(groups = "long")
    public void roundRobinWith2DCsTest() throws Throwable {


        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new RoundRobinPolicy());
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(2, 2, builder);
        try {


            createSchema(c.session);
            init(c, 12);

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     * that we do not destroy the keys.
     */
    @Test(groups = "long")
    public void tokenAwareCompositeKeyTest() throws Throwable {


        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy()));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(2, builder);


        Session session = c.session;


        try {

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            c.discard();
        }
    }


    public void tokenAwareTest(boolean usePrepared) throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy()));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session);
            init(c, 12);

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        }
    }


    @Test(groups = "long")
    public void tokenAwareWithRF2Test() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy()));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(2, builder);
        try {


            createSchema(c.session, 2);
            init(c, 12);

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    private static final Logger logger = LoggerFactory.getLogger(CCMBridge.class);


    @Test(groups = "long")
    public void testRFOneTokenAware() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy()));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session, 1);
            init(c, 12, ConsistencyLevel.ONE);

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        }
    }


    @Test(groups = "long")
    public void testRFTwoTokenAware() throws Throwable {
        Cluster.Builder builder = Cluster.builder().withLoadBalancingPolicy(new TokenAwarePolicy(new RoundRobinPolicy()));
        CCMBridge.CCMCluster c = CCMBridge.buildCluster(3, builder);
        try {


            createSchema(c.session, 2);
            init(c, 12, ConsistencyLevel.TWO);

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