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[IMPROVED] High CPU and Memory usage on replicated mirrors with very …
…high starting sequence. (#4249) When creating replicated mirrors where the source stream had a very large starting sequence number, the server would use excessive CPU and Memory. This is due to the mirroring functionality trying to skip messages when it detects a gap. In a replicated stream this puts excessive stress on the raft system. This step is not needed at all if the mirror stream has no messages, we can simply jump ahead. Signed-off-by: Derek Collison <derek@nats.io>
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