Dubbo-go has a built-in client-based load balancing mechanism. Below are the currently supported load balancing algorithms. Combined with the automatic service discovery mechanism mentioned above, the consumer side will automatically use the Weighted Random LoadBalance strategy for invocation.
If you want to adjust the load balancing algorithm, here are the built-in load balancing strategies in the Dubbo framework:
| Algorithm | Features | Remarks | Configuration Value |
|---|---|---|---|
| Weighted Random LoadBalance | Weighted Random | Default algorithm, same default weight | random (default) |
| RoundRobin LoadBalance | Weighted Round Robin | Inspired by Nginx’s smooth weighted round robin algorithm, same default weight | roundrobin |
| LeastActive LoadBalance | Least Active First + Weighted Random | Based on the idea that those who can do more should work more | leastactive |
| Consistent Hash LoadBalance | Consistent Hash | Deterministic input, deterministic providers, suitable for stateful requests | consistenthashing |
| P2C LoadBalance | Power of Two Choices | Randomly selects two nodes and continues to select the one with fewer “connections.” | p2c |
| Interleaved Weighted Round Robin | A weighted round robin algorithm | https://en.wikipedia.org/wiki/Weighted_round_robin#Interleaved_WRR | interleavedweightedroundrobin |
| Alias Method Round Robin | https://en.wikipedia.org/wiki/Alias_method | aliasmethod |
The default strategy of the Dubbo framework is random weighted random load balancing. To adjust the strategy, simply set the corresponding value for loadbalance. Refer to the table at the top of the document for different load balancing strategy values.
Specify global configuration for all service calls:
cli, err := client.NewClient(
client.WithClientLoadBalance("roundrobin"),
)
Or some commonly used strategies:
cli, err := client.NewClient(
client.WithClientLoadBalanceRoundRobin(),
)
cli, err := client.NewClient(
//...
)
svc, err := greet.NewGreetService(cli, client.WithLoadBalance("roundrobin"))
Or some commonly used strategies:
cli, err := client.NewClient(
//...
)
svc, err := greet.NewGreetService(cli, client.WithLoadBalanceRoundRobin())