[GitHub] [dubbo] Hearen opened issue #5045: How to understand least active road balance well?

["Hearen (GitHub)" <gi...@apache.org>]

I've sought all sites I could reach and read all docs related to this topic but still I am not getting it. 

Sorry to post a question like this in issue part. But I have nowhere to go for the help. 

I know from the official doc:

> The active number refers to the difference between the counts before and after the call. Select the machine with the minimum number of active calls or choose a random one among machines with the same active number, so that the slower machine can receives less requests.

It's not a problem to understand the last half part but as for the **active number definition**, I am really into confusion. And also there is an case to explain it officially as

> When A machine starts processing the request, the counter is incremented by 1. At this time, A is still processing. If the processing is completed, the counter is decremented by 1. B machine processes very quickly after receiving the request. Then the active numbers of A and B are 1,0 respectively.

To my understanding, A processes one (`before`) and still have one (`after`) while B one (`before`) and have zero (`after`) then the difference should be A: 0 and B: -1. 

Weird result but it's based on the difinition. 

What's the misunderstanding here? Really confusing here. Any help will be appreciated ;)

[ Full content available at: https://github.com/apache/dubbo/issues/5045 ]
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