code: private boolean prepareToResearchTMCluster() {
          int count = tryConnectCount.incrementAndGet();
          int size = txClientConfig.getManagerAddress().size();
          if (count == size) {
              TMSearcher.search();
              return false;
          } else if (count > size) {
              return !TMSearcher.searchedOne();
          }
          return true;
      }
docs: 准备搜索TM
  
  @return true 搜索结束