[GitHub] [rocketmq] Kingdon1992 opened a new issue #2783: ThreadLocalIndex getAndIncrement return value may only have two values

Tue, 06 Apr 2021 03:17:35 -0700 


Kingdon1992 opened a new issue #2783:
URL: https://github.com/apache/rocketmq/issues/2783


   BUG REPORT
   
![image](https://user-images.githubusercontent.com/42442066/113693142-de483380-9700-11eb-829f-987bed085518.png)
   
   1. When `index` reaches `Integer.MAX_VALUE`,the next value of `index` will 
be `Integer.MIN_VALUE`
   2. `Math.asb(Integer.MIN_VALUE)` will be `Integer.MIN_VALUE`
   3. Then `getAndIncrement()` return value will always be `Integer.MAX_VALUE` 
or `Integer.MIN_VALUE`
   4. Considering that the initial value of index is random, it can be very 
close to `Integer.MAX_VALUE` at the beginning
   5. Although there are multiple `MessageQueue` for the target topic, only two 
`MessageQueue` will actually be selected
       - pos=0
       - pos=Math.abs(Integer.MAX_VALUE) % this.messageQueueList.size();
   
   
![image](https://user-images.githubusercontent.com/42442066/113695761-d211a580-9703-11eb-8ba5-3ad6ff6d85bf.png)
   


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