Redis persistence problem and final solution

summary

redis As a cache , In order to achieve high performance , The data is directly put into the cache , Then it is bound to face a problem of power failure and data loss . For applications with low traffic , The big deal is through the database , Restore data to cache ; For high concurrency applications , Cache downtime lost data , Can cause avalanches , breakdown , A series of problems such as penetration .

AOF Persistence scheme

 How it works :
     1. Every time the client receives a command , After the execution , Write log data to AOF In file 
     
     2. Write back to AOF Files have three strategies ,Always( After each command is executed , Write back to disk now ),Everysec( Logs in the cache are written back to each second 
        disk )