Traceback (most recent call last):
  File "/Users/magicliang/Desktop/Programming/git/hexo-blog/examples/system-design/labs/35/session-dispatch/test_position_reservation.py", line 40, in <module>
    assert observation['reserved'] is False, 'position expired while reservation waited for write lock'
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: position expired while reservation waited for write lock
