@Override
    public Iterator<RegionReplicaInfo> iterator() {
      return Iterators.limit(sourceIterator, scanLimit != null ? scanLimit : SCAN_LIMIT_DEFAULT);
    }
@return {@code true} when the underlying {@link ResultScanner} is not yet exhausted,
        {@code false} otherwise.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/http/MetaBrowser.java