Be independent on system time

[ct-clearhaus]

Time may differ on instances running, so the lock acquiring timeout may be different than what's configured if two systems sharing the lock has time drifting away from each other.

What about writing something "random" (collision resistant; just incremental?) rather than :created time (https://github.com/clearhaus/dynamodb-mutex/blob/master/lib/dynamodb_mutex/lock.rb#L36) and then each instance checks if it has seen the given "random" for :ttl time?

Then :ttl becomes kinda ":min_ttl", or the TTL that will always be experienced. Needs to be documented. It's also easy to document that you need time on instances to be right, but the bugs you may experience with time drifting is probable less fun than the configuration trouble you have when setting the TTL.