36 day assault Tencent finally took the offer! Redis, high concurrency

• How caching is used in projects ？ Why cache ？ What are the consequences of improper use of cache ？

• redis  and  memcached  What's the difference? ？redis  What is the thread model of ？ Why?  redis  Single thread can support high concurrency ？

• redis  What are the data types ？ Which scenarios are suitable for use ？

• redis  What are the expiration policies of ？ What are the memory elimination mechanisms ？ Write it by hand  LRU  Code implementation ？

• How to ensure  redis  High concurrency and availability of ？redis  Can you introduce the principle of master-slave replication of ？redis  Can you introduce the sentinel principle of ？

• redis  How to persist ？ What are the advantages and disadvantages of different persistence mechanisms ？ How to realize the specific bottom layer of persistence mechanism ？

• redis  Can you explain the working principle of cluster mode ？ In cluster mode ,redis  Of  key  How to address ？ What algorithms do distributed addressing have ？ Understanding consistency  hash  Algorithm ？

• Understand what is  redis  The avalanche of 、 Penetration and breakdown ？redis  What happens after the crash ？ How should the system deal with this situation ？ How to deal with it  redis  The penetration ？

• How to ensure the double write consistency between cache and database ？

• redis  What is the concurrent competition problem of ？ How to solve this problem ？ understand redis  The transaction  CAS  The plan ？

• In production environment  redis  How it was deployed ？

• I said  dubbo  How it works ？ Can I continue to communicate if the registration center hangs up ？ Say it once  rpc  Requested process ？

• dubbo  Which communication protocols are supported ？ Which serialization protocols are supported ？ The way Hessian  Data structure of ？PB  Do you know? ？ Why?  PB  Is the most efficient ？

• dubbo  What are load balancing strategies and cluster fault tolerance strategies ？ Dynamic agent strategy ？

• dubbo  Of  spi  What is thought ？

• How to base on  dubbo  Conduct service governance 、 service degradation 、 Failed retries and timeout retries ？

• 《 A big factory Java Analysis of interview questions + Back end development learning notes + The latest architecture explanation video + Practical project source code handout 》 Open source
   
  How to design idempotence of distributed service interface （ For example, you can't deduct money repeatedly ）？

• How to ensure the order of distributed service interface requests ？

• How to design a similar  Dubbo  Of  RPC  frame ？

• zookeeper  What are the usage scenarios ？

• What are the general ways to implement distributed locks ？ Use  redis  How to design distributed locks ？ Use  zk  Can we design distributed locks ？ Which is the most efficient way to implement these two distributed locks ？

• Do you understand distributed transactions ？ How do you solve the problem of distributed transactions ？ Psychological analysis of interviewers

• Distributed in cluster deployment  session  How to achieve ？

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