[Feature] RandomLoadBalance some questions

[bigprincipalkk]

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Apache Dubbo Component

Java SDK (apache/dubbo)

Descriptions

There are two questions about RandomLoadBalance：

1. Why choose 4 as the critical value for switching binary search
2. In the else branch, it should handle nodes with a weight of 0, but where does it ensure that i does not exceed the boundary

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[bigprincipalkk]

I understand, it should be the binary search method of Arrays that ensures that the last element will not be retrieved

[AlbumenJ]

Node with 0 weight should be ignored