@Override
  protected AdminResponse createResponse(DistributionManager dm) {
    CancellationRegistry.getInstance().registerMessage(this);

    resp = RegionSubRegionsSizeResponse.create(dm, getSender());
    if (cancelled) {
      return null;
    }

    resp.populateSnapshot(dm);

    CancellationRegistry.getInstance().deregisterMessage(this);
    return resp;
  }
Returns a <code>RegionSubRegionSizeRequest</code> to be sent to the specified recipient.
geode-core/src/main/java/org/apache/geode/internal/admin/remote/RegionSubRegionSizeRequest.java