The first interview mainly examines the basics. First, briefly introduce yourself and introduce the project, and then start to examine the basics.

Basic knowledge of TCP

Question 1: Please describe the process of three-way handshake and four-way handshake in detail

You are required to be familiar with the mechanism of three-way handshake and four-way handshake, and draw a state diagram.

Basic knowledge of cache and database

Question 1: Describe the data structures of redis.

There are 5 basic data structures, String/List/Hash/Set/Zset, and the advanced data structures HyperLogLog/BitMap/BloomFilter/GeoHash were also answered. The interviewer also asked about the principle of BloomFilter and the implementation principle of Zset, mainly explaining the jump table; how to implement the delay queue, and the principle of distributed locks.

Question 2: MySQL scenario question

The interviewer provides a scenario and requires writing query SQL, examining joint statements, how to paginate, and the optimization of complex statements.

Second interview:

The second interview is a telephone interview, mainly examining the project and asking basic questions through the project. Time 30 minutes.

Previous experience with microservices, the interviewer asked in detail about the architecture of microservices, the implementation of the framework, service governance, distributed consistency and other issues.

I have played with log monitoring systems before, so I first examined the architecture and related knowledge of ELK, focusing on describing some architectural principles of Elasticsearch, such as the principle of inverted index.

Asked about the knowledge of message queues, I have been exposed to Kafka, and asked whether messages in Kafka can be consumed by multiple consumers; as well as the election mechanism and HW mechanism.

Open questions, talk about a problem you encountered before and how you solved it. This describes the problem running in the production process and describes the troubleshooting problem.

Nude Writing Algorithms

The Latest Common Ancestor of Multiple Nodes in a Binary Tree

Interview 3 and Interview 4

The third and fourth interviews are for team leaders and directors to discuss problem-solving ideas and projects. The characteristics of these two interviews are that they ask relevant questions based on project experience, require breadth, and especially examine the breadth of architecture. The current project scale will be expanded dozens of times, and the architecture will be redesigned. At the same time, some stress interviews are involved.