Ant team spent chanting face questions: LinkedHashMap + SpringCloud + + distributed lock thread

 

one side

1. Self introduction
2. map how to achieve hashcode and equals, Why override equals you must override the hashcode
3. Which of the concurrent use of packet-based, usage scenarios and the like.
4. concurrentHashMap how to achieve? concurrenthashmap What is the difference between 1.8 and 1.7 inside
5. CountDownLatch, LinkedHashMap, AQS implementation principle
6. What are the thread pool RejectedExecutionHandler, respectively usage scenarios
7. Multi-threaded lock? How optimization? Biased lock, lock lightweight, heavyweight lock?
8. Composite index? How B + tree stored?
9. Why cache update policy is to update the database to delete the cache
10. OOM say something? How to troubleshoot? Which will lead to OOM?
11. OSI seven-layer structure, each structure are doing?
12. java thread-safe queue points to note
13. Cause of a deadlock, how to avoid

Two faces

1. jvm virtual machine's old and under what circumstances gc happens, give you a scene, a 4-core 8G server, two hours would occur once every gc years old, now have a log, how analysis is where the problem
2. Database index What? Underlying how to achieve? How to optimize the database?
3. Transaction database, said about the four properties, respectively, what, how to achieve?
4. How to server load balancing, what algorithm, which is better, consistent hashing principle, how to avoid DDOS attack hit a few machine request
5. volatile talk
6. What are design patterns? Decorator, agents talk about?
7. redis clusters will it?
8. mysql storage engine
9. Transaction isolation level
10. Non-repeatability and phantom read, how to avoid, how to achieve the underlying (lock table row lock)

Three sides

1. Project Introduction
2. Distributed Lock is how to achieve
3. MySQL, which has several join way, what is the underlying principle
4. What data structures Redis there? What are the underlying code? What are sorted linked list using different coding?
5. Redis expansion, failure of key clean-up
6. Redis persistence how to do, aof and rdb, what's the difference, what advantages and disadvantages.
7. How MySQL database to achieve sub-library sub-table, and data synchronization?
8. Single sign-on is how to achieve?
9. SpringBoot talk about understanding and SpringCloud
10. How future technology career planning?
11. Why Ali?

These are the ants spend chant teams face questions, the latest and most complete summary of the 2018 Ali Group Senior Java will answer questions range and are for reference only ~

---

Ali will be the most complete high-level Java exam questions and answers range

 

Obtaining answers

+ Focus point after praise, private letters Keywords [Ali] to get detailed answers to the link!

+ Focus point after praise, private letters Keywords [Ali] to get detailed answers to the link!