public HDFSBlocksDistribution getHDFSBlocksDistribution() {
    HDFSBlocksDistribution hdfsBlocksDistribution = new HDFSBlocksDistribution();
    stores.values().stream().filter(s -> s.getStorefiles() != null)
      .flatMap(s -> s.getStorefiles().stream()).map(HStoreFile::getHDFSBlockDistribution)
      .forEachOrdered(hdfsBlocksDistribution::add);
    return hdfsBlocksDistribution;
  }
Returns True if this region has references.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java