xiaoyaofawai commented on issue #3240:
URL: https://github.com/apache/rocketmq/issues/3240#issuecomment-895710016


   ConsumeQueue support read data by message index, as you see:
   
![image](https://user-images.githubusercontent.com/12688996/128805753-a9f1e64d-edc6-4120-96b1-c17984d901fc.png)
   ConsumeQueue read data relay on MappedFileQueue, data offset can be 
calculated by 'startIndex' . the index of MappedFile in MappedFileQueue and the 
offset of data in MappedFile can be calculated by data offset.The time 
complexity of these processes is O(1), so the time complexity of reading data 
by startIndex from ConsumeQueue is O(1)


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