@Override
  public String toString() {
    final StringBuilder sb = new StringBuilder("[BucketAdvisor ").append(getAdvisee().getFullPath())
        .append(':').append(getAdvisee().getSerialNumber()).append(": ");
    sb.append("state=").append(primaryStateToString());
    sb.append("]");
    return sb.toString();
  }
returns the set of all the members in the system which require both DistributedCacheOperation
messages and notification-only partition messages

@return a set of recipients requiring both cache-op and notification messages
@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/internal/cache/BucketAdvisor.java