public void getDataNodeHeartBeat(
      TEndPoint endPoint, TDataNodeHeartbeatReq req, DataNodeHeartbeatHandler handler) {
    try {
      clientManager.borrowClient(endPoint).getDataNodeHeartBeat(req, handler);
    } catch (Exception ignore) {
      // Just ignore
    }
  }
Only used in LoadManager.

@param endPoint The specific DataNode
iotdb-core/confignode/src/main/java/org/apache/iotdb/confignode/client/async/AsyncDataNodeHeartbeatClientPool.java