cluster.sh emitted one endpoint arg per node, which brought the rig up as
four independent server pools. Multi-pool GET resolves the owning pool via
getLatestObjectInfoWithIdx (a per-pool xl.meta read) before the set-level
fast path runs, so BUCKIT_FAST_GET=1 still read xl.meta and the single-trip
path was never exercised.
Emit a single pool spanning all nodes (http://node{1...4}:9000/data/...)
so SinglePool() is true and GET dispatches straight to the set, letting the
fast path bypass xl.meta. Regenerated docker-compose.yml reflects the change.