@Override
  public boolean equals(Object o) {
    return o instanceof HRegion && Bytes.equals(getRegionInfo().getRegionName(),
      ((HRegion) o).getRegionInfo().getRegionName());
  }
Attempts to atomically load a group of hfiles. This is critical for loading rows with multiple
column families atomically.
@param familyPaths      List of Pair&lt;byte[] column family, String hfilePath&gt;
@param bulkLoadListener Internal hooks enabling massaging/preparation of a file about to be
                        bulk loaded
@param copyFile         always copy hfiles if true
@param clusterIds       ids from clusters that had already handled the given bulkload event.
@return Map from family to List of store file paths if successful, null if failed recoverably
@throws IOException if failed unrecoverably.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java