Java Interview Clearance Points Summary Set of Microservices Reference Answers

Microservices

Microservices

• How to separate the front and back ends

  In the front-end and back-end separation architecture, the back-end only needs to be responsible for providing callable API services to the front-end according to the agreed data format. The front-end and back-end interact through HTTP requests. After the front-end obtains the data, the page is assembled and rendered, and finally returned to the browser.
  | Backend | Frontend | |
  | ----------------------------------------- | ------------------------------------------------- ----------- | -------------------------------------- ---------------------- |
  | Server | Browser | |
  | JAVA | NodeJS | JS + HTML + CSS |
  | Service layer provides data interface to maintain data stability Encapsulate business logic | JS running on the server forwards data, concatenates service routing design, controls logic to render pages, and experiences more possibilities for optimization | JSCSS, JS running on the browser loads and runs DOM to operate any front-end framework and Tool sharing template, routing |
  Reference from:  https://www.jianshu.com/p/fc0c63404cc7  and  http://2014.jsconf.cn/slides/herman-taobaoweb/index.html#/69

• Which frameworks are microservices

  Dubbo is the core framework of Alibaba's service-oriented governance, and is widely used in various member sites of Alibaba Group. Alibaba's contributions to the open source community in recent years are remarkable both at home and abroad. For example, JStorm donated to Apache and joined the Apache Foundation, which has won the face of Chinese Internet people and made Alibaba in the eyes of Chinese people. It has been upgraded from an e-commerce company to a technology company.
  Spring Cloud, we can know from the name that it is the product of Spring Source. The strong endorsement of the Spring community can be said to be the most influential organization in the Java enterprise world. In addition to Spring Source, there are also Pivotal and Netfix. The backing and technical output. Among them, the whole set of microservice architecture suite open sourced by Netflix is ​​the core of Spring Cloud.
  Reference from: http://blog.didispace.com/microservice-framework/

• How do you understand the RPC framework

  Please refer to:  https://www.zhihu.com/question/25536695

• Talk about the implementation principle of RPC

  First of all, there needs to be a module that handles network connection communication, which is responsible for connection establishment, management and message transmission. Secondly, there needs to be a module for encoding and decoding, because network communication is all transmitted bytecode, and the objects we use need to be serialized and deserialized. The rest is the part of the client and the server. The server exposes the service interface to be opened. The client calls a proxy implementation of the service interface. This proxy implementation is responsible for collecting data, encoding and transmitting it to the server and then waiting for the result to return.
  Reference from:  https://liuzhengyang.github.io/2016/12/16/rpc-principle/

• Talk about the implementation principle of Dubbo

  As an rpc framework, dubbo achieves the effect of calling remote methods just like calling them locally. How to do it? That is, there is a description of the remote method locally, including the method name, parameters, and return value. In dubbo, the remote and local use the same interface; then, there must be an encapsulation for network communication, and the communication details for the caller are It is completely invisible. What network communication needs to do is to pass the attributes of the calling method to the server through a certain protocol (in short, the message format); the server parses the calling information according to the protocol; executes the corresponding method; The return value of the method is passed to the client through the protocol; the client parses it again; in terms of calling methods, it can be divided into synchronous calls and asynchronous calls; in short, this is basically the process
  Author: Beiming Youyu
  Link: https://www .zhihu.com/question/52133065/answer/129153953Source
  : Zhihu
  The copyright belongs to the author. For commercial reprints, please contact the author for authorization, and for non-commercial reprints, please indicate the source.

• How do you understand RESTful

  http://www.cnblogs.com/artech/p/3506553.html

• Talk about how to design a good API

  https://juejin.im/entry/59b8d34c6fb9a00a4455dd04

• How to understand the idempotency of RESTful APIs

  http://blog.720ui.com/2016/restful_idempotent/

• How to ensure the idempotency of interfaces

  http://www.spring4all.com/article/914

• Talk about CAP theorem and BASE theory

  http://my.oschina.net/foodon/blog/372703

• How to Consider Data Consistency

  https://opentalk.upyun.com/310.html

• Talk about the implementation of eventual consistency

  http://www.cnblogs.com/soundcode/p/5590710.html

• What do you think about microservices

  http://dockone.io/article/394

• Difference Between Microservices and SOA

  http://dockone.io/article/2399

• How to split services

  http://dockone.io/article/2516

• How Microservices Do Database Management

  http://www.uml.org.cn/wfw/201705271.asp

• How to deal with chain call exceptions of microservices

  http://blog.720ui.com/2017/msa_design/?utm_source=tuicool&utm_medium=referral

• For fast tracking and locating problems

  dependency log

• Security for Microservices

  http://dockone.io/article/1507

distributed

• Talk about the use of distributed scenarios in business

  https://segmentfault.com/q/1010000006095431/a-1020000006114658

• Session distributed solution

  https://yq.aliyun.com/articles/387723

• Distributed Lock Scenario

  https://yq.aliyun.com/articles/465311

• Distribution is an implementation of locks

  https://yq.aliyun.com/articles/60663

• Distributed transaction

  http://www.hollischuang.com/archives/681

• Algorithms and Implementations of Clustering and Load Balancing

  https://yq.aliyun.com/articles/218895

• Talk about sub-library and sub-table design

  http://blog.720ui.com/2017/mysql_core_08_multi_db_table/

• Distributed dilemma and countermeasures brought by sub-database and sub-table

  http://blog.720ui.com/2017/mysql_core_09_multi_db_table2/

safe question

• Security Elements and STRIDE Threats

  http://blog.720ui.com/2017/security_stride/

• Protection against common web attacks

  http://blog.720ui.com/2016/security_web/

• Server communication security attack and defense

  http://blog.720ui.com/2016/security_data_transmission/

• Analysis of the principle of HTTPS

  http://blog.720ui.com/2016/security_https/

• HTTPS downgrade attack

  http://blog.jobbole.com/106792/

• Authorization and Authentication

  https://www.jianshu.com/p/cda95dff698c

• role-based access control

  https://www.douban.com/note/259930498/

• Data-Based Access Control

  https://www.zhihu.com/question/64888533

performance optimization

• What are the performance indicators

  https://www.douban.com/note/168911628/

• How to spot performance bottlenecks

  http://blog.csdn.net/shan9liang/article/details/24035001

• Common means of performance tuning

  http://blog.csdn.net/jyonghu003/article/details/70055832

• Talk about how you perform performance tuning in your project

  https://www.jianshu.com/p/08d029607b9a