code: boolean isReady() {
          final GroupDetails[] ds = destinations.get();
          if(ds == null)
              return false;
          for(final GroupDetails d: ds)
              if(d == null)
                  return false;
  
          final boolean ret = ds.length != 0 && getIndex(ds, clusterName) >= 0; // this method is only called in tests and this needs to be true there.
  
          if(ret && LOGGER.isDebugEnabled())
              LOGGER.debug("at {} to {} is Ready " + shorthand(cvrt(ds, clusterName)), thisNodeId, clusterId);
  
          return ret;
      }
docs: This makes sure all of the destinations are full.