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Golang 实现加权轮询负载均衡

实现加权轮询负载均衡思路

代码实现一个加权负载均衡

• Weight 初始化时对节点约定的权重
• currentWeight 节点临时权重，每轮都会变化
• effectiveWeight 节点有效权重，默认与Weight相同
• totalWeight 所有节点有效权重之和：sum(effectiveWeight)

代码实现一个加权负载均衡

1. currentWeight = currentWeight+effecitveWeight
2. 选中最大的 currentWeight 节点为选中节点
3. currentWeight = currentWeight-totalWeight (4+3+2=9)

所以我们能够 在表格模拟运行情况：

请求次数	请求前currentWelght	选中的节点	请求后currentWelght
1	[serverA=4,serverB=3,serverC=2]	serverA	[serverA=-1,serverB=6,serverC=4]
2	[serverA=-1,serverB=6,serverC=4]	serverB	[serverA=3,serverB=0,serverC=6]
3	[serverA=3,serverB=0,serverC=6]	serverc	[serverA=7,serverB=3,serverC=-1]
4	[serverA=7,serverB=3,serverC=-1]	serverA	[serverA=2,serverB=6,serverC=1]
5	[serverA=2,serverB=6,serverC=1]	serverB	[serverA=6,serverB=0,serverC=3]
6	[serverA=6,serverB=0,serverC=3]	serverA	[serverA=1,serverB=3,serverC=5]
7	[serverA=1,serverB=3,serverC=5]	serverc	[serverA=5,serverB=6,serverC=-2]

加权轮询负载均衡代码

测试代码

测试结果