void regionOpenedWithoutPersistingToMeta(RegionStateNode regionNode)
    throws UnexpectedStateException {
    regionNode.transitionState(State.OPEN, STATES_EXPECTED_ON_OPEN);
    RegionInfo regionInfo = regionNode.getRegionInfo();
    regionStates.addRegionToServer(regionNode);
    regionStates.removeFromFailedOpen(regionInfo);
  }
Resolve a cached {@link RegionInfo} from the encoded region name as a {@code String}.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java