This document discusses how to ensure tasks are not run concurrently by using different types of locks, including thread locks, file locks, and distributed locks that can be implemented using services like Zookeeper, etcd, or DynamoDB. It also addresses what a lock is, how locks can automatically unlock and be refreshed by the owner, and provides information about the company Tourlane and how they are hiring.

1. Run once
Or how to ensure that we are not concurrent

2. Guillermo

3. Tourlane

11. BI

14. One api we were consuming
Took 30 minutes to answer

15. After 5 minutes of starting
New task was scheduled

17. We need to prevent concurrency
What an irony!

18. a) Thread lock
b) File lock
c) Distributed lock

19. a) Zookeeper
b) Hosted etcd
c) DynamoDB

20. What is a lock?

21. Automatic unlock
Can’t lock if lock already
Can lock again for the owner
(refresh)

22. aws cli to the rescue

32. We are hiring
Twitter: @tourlane_dev
www.tourlane.de
Twitter: @guillermooo