@Override
  public CacheServer[] getCacheServers() throws AdminException {
    Collection coll = getCacheVmsCollection();
    if (coll == null) {
      return null;
    }
    CacheServer[] array = new CacheServer[coll.size()];
    coll.toArray(array);
    return array;
  }
Returns all the cache server members of the distributed system which are hosting a client queue
for the particular durable-client having the given durableClientId

@param durableClientId - durable-id of the client
@return array of CacheServer(s) having the queue for the durable client

@since GemFire 5.6
geode-core/src/main/java/org/apache/geode/admin/internal/AdminDistributedSystemImpl.java