@Override
  public HRegion getRegion(final String encodedRegionName) {
    return this.onlineRegions.get(encodedRegionName);
  }
@return HRegion for the passed binary <code>regionName</code> or null if named region is not
        member of the online regions.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java