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For follower fetch, the leader only returns the data that is still in the leader's local storage. If a LogSegment copied into Remote Storage by a Leader Broker and updated its RemoteOffsetIndex, it's not necessary for Follower to copy this segment which is already present in Remote Storage. Instead a follower will retrieve the information of the segment from remote storage. If a Replica becomes a Leader, It can still locate and serve data from Remote storage.

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