jihoonson commented on issue #9322: Kafka Indexing Service consumer properties 
not respected
URL: https://github.com/apache/druid/issues/9322#issuecomment-583048861
 
 
   Hi @abossert, I believe it is hard-coded by design. The Kafka indexing 
service is designed to guarantee the exactly-once ingestion which requires 
Druid to track valid offsets of partitions. If some offsets are expired and 
automatically reset in Kafka, Druid will find some gaps between the offsets 
from Kafka and the ones it is aware of, which will lead to an internal error. 
If you want to reset automatically with the Kafka indexing service, please 
consider setting `resetOffsetAutomatically` and `useEarliestOffset` properly in 
the tuningConfig. Also, please note that resetting automatically will lead to 
DATA LOSS (when `useEarliestOffset = false) or DATA DUPLICATION (when 
`useEarliestOffset = true).

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