Distributed solution - distributed lock solution - redis based distributed lock implementation

Distributed lock solutions

Distributed lock can be implemented in three ways ：

1. Database optimistic lock ;
2. be based on Redis Distributed locks for ;
3. be based on ZooKeeper Distributed locks for

Database optimistic lock ;

be based on Redis Distributed locks for ;

be based on ZooKeeper Distributed locks for

be based on zookeeper Distributed lock implemented by instantaneous ordered nodes , Its main logic is as follows （ The figure comes from IBM Website ）. The general idea is ： When each client locks a function , stay zookeeper Under the directory of the specified node corresponding to the function , Generate a unique instantaneous ordered node . The way to determine whether to acquire a lock is simple , Only one of the ordered nodes with the smallest sequence number needs to be judged . When the lock is released , Just delete the instantaneous node . meanwhile , It can avoid the lock cannot be released due to service downtime , And the deadlock problem .

High lock security ,zk Be persistent