@Override
  protected void appendFields(StringBuilder buff) {
    super.appendFields(buff);
    buff.append("; cbArg=").append(cbArg).append("; op=").append(op);
    buff.append("; prSerial=" + prSerial);
    buff.append("; bucketSerials (" + bucketSerials.length + ")=(");
    for (int i = 0; i < bucketSerials.length; i++) {
      buff.append(bucketSerials[i]);
      if (i < bucketSerials.length - 1) {
        buff.append(", ");
      }
    }
  }
@param recipients set of members who have the PartitionedRegion defined.
@param r the PartitionedRegion to destroy on each member
@return the response on which to wait for the confirmation
geode-core/src/main/java/org/apache/geode/internal/cache/DestroyPartitionedRegionMessage.java