Consistent Hash Site Selection
Feature description
[Analysis of Dubbo Consistent Hash Load Balancing Implementation](/zh/blog/2019/05/01/dubbo-%E4%B8%80%E8%87%B4%E6%80%A7hash%E8%B4%9F%E8 %BD%BD%E5%9D%87%E8%A1%A1%E5%AE%9E%E7%8E%B0%E5%89%96%E6%9E%90/)
scenes to be used
When there are multiple servers, the server is selected according to the consistent hashing of the request parameters.
How to use
There are many ways to configure consistent hashing, the most common are:
Annotation configuration
@DubboReference(loadbalance = “consistenthash”)
API configuration
referenceConfig.setLoadBalance(“consistenthash”);
Properties configuration
dubbo.reference.loadbalance=consistenthash
XML configuration
<dubbo:reference loadbalance=“consistenthash” />
By default, the first parameter is used as the hash key. If you need to switch parameters, you can specify the hash.arguments
property
ReferenceConfig<DemoService> referenceConfig = new ReferenceConfig<DemoService>();
// ...init
Map<String, String> parameters = new HashMap<String, String>();
parameters. put("hash. arguments", "1");
parameters. put("sayHello. hash. arguments", "0,1");
referenceConfig.setParameters(parameters);
referenceConfig.setLoadBalance("consistenthash");
referenceConfig. get();
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