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The pdf version of the Java Technology Core Development Manual that has been hard for a month. Let’s take a look at the mind map of this article. I will explain the following contents. The content is very dry, and the friends hope to forward it after reading it.
This Java basic core summary and Java advanced architecture interview knowledge points are compiled, a total of 253 pages, free to share with everyone!
Java basic core summary:
Support bookmarks, mind maps are also very clear.
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Java advanced architecture interview knowledge points:
It supports bookmarks, and the mind map is also very clear with pictures and texts for better understanding.
message queue
- Why use message queues? What are the advantages and disadvantages of message queues? What are the advantages and disadvantages of KaActiveMQ, RabbitMQ, RocketMQ?
- How to ensure the high availability of the message queue?
- How to ensure that messages are not re-consumed? In other words, how to ensure the idempotence of message consumption?
- How to ensure the reliable transmission of messages? In other words, how to deal with the problem of message loss?
- How to ensure the order of messages?
- How to solve the delay and expiration of the message queue? What should I do when the message queue is full? There are millions of news backlogged for several hours, talk about how to solve it?
- If you are asked to write a message queue, how to design the architecture? Tell me about your thoughts.
- Can you tell me about the principle of es distributed architecture (how does es realize distributed
- what)?
SpringCloud microservice architecture
- What is Spring Cloud?
- What are the advantages of using Spring Cloud?
- What does service registration and discovery mean? How does Spring Cloud implement it?
- What is the significance of load balancing?
- What is Hystrix? How does it achieve fault tolerance?
- What is a Hystrix circuit breaker? Do we need it?
- What is Netflix Feign? What are its advantages?
- What is Spring Cloud Bus? Do we need it?
Redis cache
- How is the cache used in the project? Why use caching? Improper use of cache
- What is the difference between redis and memcached? What is the threading model of redis? Why can redis single thread support high concurrency?
- What data types does redis have? In which scenarios is it appropriate to use?
- What are the expiration strategies of redis? What are the memory elimination mechanisms? Write the LRU code by hand
- How to ensure the high concurrency and high availability of redis? Can you introduce the principle of redis master-slave replication? Can you introduce the principle of redis sentry?
- What are the ways to persist redis? What are the disadvantages of different persistence mechanisms? How is the specific underlying persistence mechanism implemented?
- Can you talk about the working principle of redis cluster mode? In cluster mode, how are redis keys addressed? What are the algorithms for distributed addressing? Know the consistent hash algorithm?
- Understand what is the avalanche, penetration and breakdown of redis? What happens after redis crashes? How should the system respond to this situation? How to deal with redis penetration?
Sub-database and sub-table
How to design a high concurrency system?
Distributed Systems
- Tell me about the working principle of dubbo? Can the registration center continue to communicate after hanging up? Tell me about the process of an rpc request?
- What communication protocols does dubbo support? Which serialization protocols are supported? Talk about Hessian's data structure? Does PB know? Why is the efficiency of PB the highest?
- What are the dubbo load balancing strategies and cluster fault tolerance strategies? What about dynamic proxy strategies?
- What is dubbo's spi idea?
- How to perform service governance, service degradation, failure retry and timeout retry based on dubbo?
- How to design the idempotence of the distributed service interface (for example, no repeated deductions)?
- How to ensure the order of distributed service interface requests?
- How to design an RPC framework similar to Dubbo?
- What are the usage scenarios of zookeeper?
Highly available architecture
- Hystrix introduction
- Resource isolation based on Hystrix thread pool technology
- Implement resource isolation based on Hystrix semaphore mechanism
- Fine-grained control of Hystrix isolation strategy
- In-depth internal principles of Hystrix execution
- Optimize bulk commodity data query interface based on request cache technology
- Fallback degradation mechanism based on local cache
- In-depth Hystrix circuit breaker implementation principle
- In-depth Hystrix thread pool isolation and interface current limit
- Provide security protection for service interface call timeout based on timeout mechanism
- How to limit the current? How is it done at work? Talk about the specific implementation?
- How to choose technology? Sentinel or Hystrix?
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