yuanlihan commented on issue #9904:
URL: https://github.com/apache/druid/issues/9904#issuecomment-632448083


   Hi @jihoonson 
   > This log means, you got two segments of overlapping intervals and same 
version. This is never allowed since Druid doesn't know what segment to read in 
this case. Druid should never create such segments of overlapping intervals but 
same version. Can you check why and how they were created? 
   
   The two partially overlapping segments with same version are created by the 
compaction task as described in step 3 of bug duplication steps above. 
According to the log of compaction task, I found that the two input partially 
overlapping segments(with different version) are arranged to compact in two 
different `indexSpec`, and creating a `DAY` granularity segment and an `HOUR` 
granularity segment correspondingly but with same version. And I pasted the log 
of compaction task 
[here](https://gist.github.com/yuanlihan/a3f54ca6eb6ba7508fcfa653065c79eb) FYI. 
And you can also easily reproduce this bug locally according to the steps 
listed above.
   
   
   


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