@Override
  public void executeOnAllQueueServers(Op op)
      throws NoSubscriptionServersAvailableException, SubscriptionNotEnabledException {
    authenticateOnAllServers(op);
    executor.executeOnAllQueueServers(op);
  }
Execute the given op on all the servers that have server-to-client queues for this pool

@param op the operation to execute
@return the result of execution if any; null if not
@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/cache/client/internal/PoolImpl.java