On: Is Redlock Safe? Reply to Redlock Analysis

[carllerche]

What if the system freezes between reading the current time from the hardware and the stead_time function returning?

In short, you CANNOT rely on time in any way shape or form for safety. You can only use it as advice & to get liveliness.

Martin's point is that Redlock pays the cost of other safe locking algorithms w/o the benefit of safety.

[jodah → carllerche]

This, usually. It's fair to point out that very specialized clocks, such as Google uses with Spanner, can allow you to achieve some consistency without coordination/locks, but for pretty much anyone else the rule you stated very much applies.

[newman314 → jodah]

FWIW, I went digging for more recent info about TrueTime and found the following.

http://www.cse.buffalo.edu/~demirbas/publications/augmentedT...