public RegionInfo getRegionInfo(final byte[] regionName) {
    final RegionStateNode regionState = regionStates.getRegionStateNodeFromName(regionName);
    return regionState != null ? regionState.getRegionInfo() : null;
  }
Resolve a cached {@link RegionInfo} from the region name as a {@code byte[]}.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/AssignmentManager.java