docs: public StoreTxLogPosition append(Operation op, K key, V value) throws DBException {
          try {
              try {
                  return this.append(storeTxLog, op, key, value);
              } catch (CapacityNotEnoughException notEnough) {
                  // 要新建一个文件
                  return this.append(nextNewStoreTxLog(), op, key, value);
              }
          } catch (Exception e) {
              throw new DBException("append dbLog error:" + e.getMessage(), e);
          }
      }