@Override
  DistributionMessage createDistributionMessage(ReplyProcessor21 replyProcessor) {
    return abortBackupFactory.createRequest(member, recipients, replyProcessor.getProcessorId());
  }
AbortBackupStep overrides addToResults in order to include members with empty persistentIds
(such as the sender).
geode-core/src/main/java/org/apache/geode/internal/cache/backup/AbortBackupStep.java