I think it's worth to add a few previous discussions about distributed locks.

Redlock is a distributed lock using Redis: https://redis.io/topics/distlock

Martin Kleppmann criticized Redlock and mentioned the fencing solution: http://martin.kleppmann.com/2016/02/08/how-to-do-distributed...

Antirez disagrees with the analysis and the HN post has a good discussion: https://news.ycombinator.com/item?id=11065933