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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, follower doesn't need 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.

RLM/RSM tasks and thread pools

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RLM/RSM tasks and thread pools RLM/RSM tasks and thread pools

Remote storage (e.g. S3 / HDFS) is likely to have higher I/O latency and lower availability than local storage.

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