The evolution process of the correct implementation principle of redis distributed lock and the summary of redison's actual combat

Redis Distributed locks use SET Can instructions be implemented ？ In the distributed world CAP Theory has always existed .

The doorway of distributed lock is not that simple , The distributed locking scheme we see on the Internet may be problematic .

Take you step by step into how distributed locks are improved step by step , How to correctly use distributed locks in high concurrency production environment .

Before entering the text , Let's think with questions first ：

• When do I need distributed locks ？
• Add 、 Is there any care about the location of the unlocked code ？
• How to avoid locks that can no longer be deleted ？
• How much is the timeout appropriate ？
• How to prevent locks from being released by other threads
• How to realize reentry lock ？
• What security problems will the master-slave architecture bring ？
• What is? Redlock
• Redisson The best practice of distributed lock
• Watchdog implementation principle
• ……

When to use distributed locks ？