code: @Override
      public boolean addAll(Collection<? extends RedisClusterNode> c) {
  
          LettuceAssert.noNullElements(c, "Partitions must not contain null elements");
  
          synchronized (partitions) {
              boolean b = partitions.addAll(c);
              updateCache();
              return b;
          }
      }
docs: Add all {@link RedisClusterNode nodes} from the given collection and update the read-view/caches.
  
  @param c must not be {@literal null}
  @return {@literal true} if this {@link Partitions} changed as a result of the call