lizhanhui opened a new issue, #4890:
URL: https://github.com/apache/rocketmq/issues/4890
There are use cases, where we need to pinpoint offset in consume queue by
the given timestamp—for example, count the number of messages for a given
message queue in the given time range.
Current implementation fails in multiple ways,
1. It ignores the fact that for a given millisecond(our clock resolution in
storage), there may exist several messages as depicted below
```text
/*
* --------------------------
* timestamp Consume Queue
* t1 1
* t1 2
* t1 3
* t3 4
* t3 5
* --------------------------
*/
```
2. For the exemplified use case, we need to further specify the lookup
strategy: if there are multiple messages matching the given timepoint, which
one is expected? the upper or the lower?
3. If the same timepoint messages span two consume queue mapped files, the
current solution is also inaccurate.
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