A load balancing policy designed to run against DSE cluster.

For most executions, the query plan will be determined by the child load balancing policy. Except for some cases, like graph analytics queries, for which it uses the preferred analytics graph server previously obtained by driver as first host in the query plan.

Inheritance: ILoadBalancingPolicy
DseLoadBalancingPolicy Class Documentation
Example #1
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 public void Should_Yield_Child_Hosts_When_No_Preferred_Host_Defined()
 {
     var lbp = new DseLoadBalancingPolicy(new TestLoadBalancingPolicy());
     var statement = new TargettedSimpleStatement("Q");
     var hosts = lbp.NewQueryPlan(null, statement);
     CollectionAssert.AreEqual(
         new[] { "101.0.0.0:9042", "102.0.0.0:9042" },
         hosts.Select(h => h.Address.ToString()));
 }
Example #2
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 public void Should_Set_Distance_For_Preferred_Host_To_Local()
 {
     var lbp = new DseLoadBalancingPolicy(new TestLoadBalancingPolicy(HostDistance.Ignored));
     Assert.AreEqual(HostDistance.Ignored, lbp.Distance(new Host(new IPEndPoint(200L, 9042), ReconnectionPolicy)));
     var statement = new TargettedSimpleStatement("Q");
     // Use 201 as preferred
     statement.PreferredHost = new Host(new IPEndPoint(201L, 9042), ReconnectionPolicy);
     lbp.NewQueryPlan(null, statement);
     Assert.AreEqual(HostDistance.Local, lbp.Distance(statement.PreferredHost));
 }
Example #3
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 public void Should_Yield_Preferred_Host_First()
 {
     var lbp = new DseLoadBalancingPolicy(new TestLoadBalancingPolicy());
     var statement = new TargettedSimpleStatement("Q");
     statement.PreferredHost = new Host(new IPEndPoint(201, 9042), ReconnectionPolicy);
     var hosts = lbp.NewQueryPlan(null, statement);
     CollectionAssert.AreEqual(
         new[] { "201.0.0.0:9042", "101.0.0.0:9042", "102.0.0.0:9042" }, 
         hosts.Select(h => h.Address.ToString()));
 }