KannarFr edited a comment on issue #6930:
URL: https://github.com/apache/pulsar/issues/6930#issuecomment-800187333


   @pointearth @sijie How do you imagine the index composition regarding 
ledgers? As the first implementation, regarding pub/sub system, timestamp 
index-based would be a good start. I think we should first be able to 
auto-create an index per topic like:
   
   ```java
   Map[Date, LedgerId]
   ```
   Or maybe
   
   ```java
   Map[Date, IndexItem]
   
   IndexItem(PreviousLedgerId, LedgerId, NextLedgerId)
   ```
   
   WDYT? Maybe we should directly point to message and not ledger.


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