Method discard

src/log/recover.cpp:122–129

  }

  void discard()
  {
    // TODO(jieyu): The discard logic here is problematic. It is
    // likely that this process never terminates after 'discard' has
    // been called on the returned future. See details in MESOS-5626.
    terminating = true;
    chain.discard();
  }

  void start()
  {