chia7712 commented on code in PR #23190:
URL: https://github.com/apache/kafka/pull/23190#discussion_r3804331618


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share-coordinator/src/main/java/org/apache/kafka/coordinator/share/ShareCoordinatorShard.java:
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@@ -563,15 +563,23 @@ public 
CoordinatorResult<InitializeShareGroupStateResponseData, CoordinatorRecor
         InitializeShareGroupStateRequestData.PartitionData partitionData = 
topicData.partitions().get(0);

Review Comment:
   Out of curiosity. Do we plan to make `initializeState` support multiple keys 
in the future? If not, should `initializeState` accept `groupId`, `topicId`, 
and `PartitionData` directly instead of `InitializeShareGroupStateRequestData`?
   
   It brings the following benefits:
   
   1. we don't need to construct construct single-element 
`InitializeShareGroupStateRequestData` objects again in the service layer
   2. we can avoid the hardcoded .get(0) calls in the shard layer
   
   WDYT?



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