This sets the preferred transfer type for LogScale. Causes LogScale to try to fetch from local nodes if possible, and only fetch from archiving if there is no other option. This means you can now get LogScale to prefer one type of transfer.

With false, local fetching will always be used unless the segment is only in archiving, and segment prefetching will only download segments that are not on another host.

With true local fetching will never be used unless the segment has not been uploaded to archiving yet, and prefetching will fetch as many segments as necessary to follow the configured replication factor.