Song list 11111

On the east side of Beijing
1. Whether non static variables of a class can be referenced in the static method of a class
2. When the class is loaded
3. What have you used or learned I/O Class of flow
3. There are several ways to create threads
4. Understanding of thread pool and corresponding parameters , What are the rejection strategies
5.mysql Know which storage engines
6.innodb and ISAM The difference between
7. Since the primary key ID And manually generate primary keys ID Which is faster , Why?
8. Index failure scenario
9.RestController and Controller The difference between
10.Springboot When modifying the configuration file , How to write a list data in the configuration file
11. The difference between interceptors and filters
12. The way Redis What are the usage scenarios

Byte video infrastructure side
1. Take a new object as Key Pass in a Hashmap in , Then modify the internal value of this object , And from this hashmap Take this object as Key Conduct Get What will be the result of the operation
2.hashmap and hashtable The difference between
3. In what units does the operating system allocate memory
4. How to understand virtual memory
5.TCP be relative to UDP In addition to the need to establish connections and more time-consuming, what are the disadvantages
6. Algorithm problem ： Enter an integer array and a positive integer k, Ask if every value in an integer array represents an edge , The size of the value is the length of the edge , Can this array surround a positive k Edge shape

Alibaba cloud side
1. use Redis What functions have you done
2.Redis What are the data structures
3.mysql What is the whole query process of a query statement in ( First establish the connection through the connector , The query cache , Syntax analysis , Analyze which index scans fewer rows and select which index , Go to query )
4.Redis Jump watch in
5.Redis How to realize distributed lock
6.redis Why so fast
7.Redis What are the memory replacement strategies for
8. say something LRU How to realize
9.JDK Which set class in is this idea (LinkedHashMap)
10.springboot The instantiation process
11. Algorithm problem ： Judge whether a linked list has links

Two sides of alicloud
1. Implement a requirement , There are two databases One is empty , The other has various watches , How to copy the data in the library to the empty database
2. How to implement any java Serialization and deserialization of objects

Byte flying Book side
1. Parameters of thread pool and their meanings
2.java What locks are there
3.Synchronize and Reentrylock The difference between
4.CountDownLatch and CyclickBarrier
5. Fair and non-fair locks
6. Which collection classes have been used
7.mysql Four levels of isolation , And the default isolation level
8. What is unreal reading
9. How repeatable reading is achieved
10.undolog redolog What is it?
11. In what units does the database store data
12.http And https The difference between
13.tcp Three handshakes, four waves
14. Why would there be waittime
15.reids What kinds of data structures are there
16.redis Jump watch
17.redis What is the threading model of
18.BIO and NIO, The understanding of multiplexing
19. Algorithm problem Recursive implementation of the list inversion

Byte international e-commerce side
1. What are the differences between abstract classes and interfaces
2.
String A = new String(“test”);
String B = new String(“test”);
1)“test”==“test”;
2)“test”==A;
3)A==B; What is the Boolean value obtained
3. Where is the constant pool
4.String StringBuilder StringBuffer The difference between
5. How to understand thread safety and thread insecurity
6. What are the ways to ensure thread safety
7.java What locks are there
8.Synchronize and Reentrylock The difference between
9. The difference between optimistic lock and pessimistic lock
10. Have you ever used locks in practice
11.CAS Principle
12. Specific scenarios using optimistic locks and pessimistic locks
13.exception and error The difference between
14. What have you seen exception and error
15.OOM What is it? , What's the difference with memory leakage
16.hashmap Principle , The principle of capacity expansion , Why is the array length 2 Of n Power
17. Sync IO And asynchronous ID The understanding of the
18. The difference between blocking and synchronization
19.NIO And multiplexing
20.mysql topic
The table structure is Primary key id full name fraction
1) Find the names of the top ten students with the highest scores ( return 10 A student )
2) Find the student names corresponding to the top ten scores with the highest scores ( May be greater than 10 A student )
21. Algorithm , Given an array A[0,1,…,n-1], Please build an array B[0,1,…,n-1], among B[i] Is the value of an array A In addition to subscript i The product of other elements , namely B[i]=A[0]×A[1]×…×A[i-1]×A[i+1]×…×A[n-1]. Division cannot be used .

Kwai machine learning platform development side
1.mysql Cluster index , Nonclustered index , Overlay index
2.redis Implement a distributed lock
3. How to use mysql Implement a distributed lock
4. How to use redis Implement a blocking lock
5.hashmap The implementation of the
6. understand Currenthashmap Well
7. Read about docker,k8s Well
8. Algorithm problem ： Two integer arrays , The index is i The user's entry time and exit time , Seek the largest number of online people in history

Kwai machine learning platform development two sides
1. Understanding of threads and processes

The process is cpu The smallest unit of allocation of resources , It is an independent unit of system resource scheduling , It is also the basic unit of the operating system , All resources are in this process , The process doesn't work , It is used to maintain these resources . The thread is working , Thread is cpu The smallest unit that performs a task , But threads don't have their own resources to run programs , Therefore, threads cannot be separated from processes .
Multi process ： Listening to music while chatting is a manifestation of multi process , It seems to be going on at the same time , It's actually cpu High speed switching between programs
A single threaded program has only one execution path
Multithreaded programs have multiple threads （ route ） Do the same thing , Multithreaded programs preempt cpu The opportunity of using the right is greater
The thread switching virtual memory space is still the same , But process switching is different
Process context switching involves switching memory address space
Thread switching refers to switching from one thread to another in the same process
Reference resources

2. How processes communicate , The way threads communicate

Each process has a different user address space , The global variables of any process cannot be seen in another process , So to exchange data between processes, you have to go through the kernel , Create a buffer in the kernel , process A Copy data from user space to kernel buffer , process B Then read the data from the kernel buffer , The mechanism provided by the kernel is called interprocess communication .
Anonymous pipeline communication 、 Advanced pipeline communication 、 Well known pipeline communication 、 Message queuing communication 、 Semaphore communication 、 The signal 、 Shared memory communication 、 Socket communication
Reference resources
Thread communication is when multiple threads operate on shared resources , Inform each other of their status to avoid competition for resources .
Shared memory 、 Messaging and pipeline flow
Reference resources

3. Do you understand

Reference resources

4. The difference between user mode and kernel mode

Reference resources

5. Pagination and segmentation , The difference between page request and segment request

Reference resources
Reference resources 1

6. Page replacement algorithm

Reference resources

7. How to achieve LRU
8. Read about docker,k8s Well
9. Four features of database transaction
10. Four isolation levels and default isolation levels
11. What are the concurrency consistency problems
12. Algorithm problem 1. The longest valid bracket sequence length
2. Concatenate the substrings of all words