AndrewJSchofield commented on PR #18894:
URL: https://github.com/apache/kafka/pull/18894#issuecomment-2658962193

   @smjn The expected flow is as follows:
   * `Admin.listShareGroupOffsets` is called with an empty collection of 
`TopicPartition` in the `ListShareGroupOffsetsSpec`. This means "list all 
offsets for this share group".
   * The group coordinator will compile a list of the topic-partitions in the 
share group (share-partitions). This will be imperfect until the initialize 
work that you mention, but I anticipate that 
`GroupCoordinatorShare.sharePartitions(List<String>, long)` will be used and 
that the response from this will be improved (fixed) as a result of the 
intialize work that you mention.
   * The group coordinator will then issue `ReadShareGroupStateSummary` 
requests to the share coordinator shards responsible for those 
share-partitions' state.


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