ServerName findDeployedHSI(Map<ServerName, List<String>> mm, RegionInfo hri) {
    for (Map.Entry<ServerName, List<String>> e : mm.entrySet()) {
      if (e.getValue().contains(hri.getRegionNameAsString())) {
        return e.getKey();
      }
    }
    return null;
  }
Returns the HSI a region info is on.
hbase-server/src/test/java/org/apache/hadoop/hbase/util/BaseTestHBaseFsck.java