boolean isPrimaryUpdaterAlive() {
    boolean result = false;
    QueueConnectionImpl primary = (QueueConnectionImpl) queueConnections.getPrimary();
    if (primary != null) {
      ClientUpdater cu = primary.getUpdater();
      if (cu != null) {
        result = cu.isAlive();
      }
    }
    return result;
  }
Manages Client Queues. Responsible for creating callback connections and satisfying redundancy
requirements.

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/cache/client/internal/QueueManagerImpl.java