@Override
  public boolean equals(Object obj) {
    if (!(obj instanceof MobReferenceOnlyFilter)) {
      return false;
    }
    return obj == this;
  }
A filter that returns the cells which have mob reference tags. It's a server-side filter.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/MobReferenceOnlyFilter.java