@Override
  protected <K, V> RegionAttributes<K, V> getRegionAttributes() {
    RegionAttributes<K, V> attrs = super.getRegionAttributes();
    AttributesFactory<K, V> factory = new AttributesFactory<>(attrs);
    factory.setOffHeap(true);
    return factory.create();
  }
Tests Distributed Ack Region with OffHeap memory.

@since Geode 1.0
geode-core/src/distributedTest/java/org/apache/geode/cache30/DistributedAckRegionOffHeapDUnitTest.java