yupeng9 opened a new issue #6121:
URL: https://github.com/apache/incubator-pinot/issues/6121


   We have some use cases that demand very fresh data. For example, display 
events aggregates of the **last minute** for decision making.
   
   However, as shown in the diagram below, the ingestion latency spikes during 
segment sealing, which breaches the SLA
   
![image](https://user-images.githubusercontent.com/13425258/95490792-92812100-094d-11eb-8c4c-d662ce3c7d11.png)
   
   The segment size is 5MB, so in this particular case, it seals every a couple 
of hours. We could try smaller segment sizes, but that may result in different 
issues like too many zookeeper nodes.
   
   The solution to this could be more optimistic on new segment creation: the 
new segments start ingestion without waiting for the sealing. However, this can 
complicate the state machine, as the segment cleanup is more complicated when 
the segment commit fails.
   
   Any other thoughts to mitigate this issue?


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