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This article mainly introduces "how to use RocketMQ to ensure that messages are not lost". In daily operations, I believe many people have doubts about how to use RocketMQ to ensure that messages are not lost. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "how to use RocketMQ to ensure that messages are not lost". Next, please follow the editor to study!

1. How does Spring solve circular dependency?

Please stop asking me about Spring circular dependency. Can I write it out for you by hand?

2. The principle of Spring Boot automatic configuration.

The principle of SpringBoot automatic configuration is explained in this article!

3. Eureka principle of Spring Cloud

Eureka boutique source code

4. As a service registry, what is the difference between Eureka and Zookeeper?

Comparison between Eureka and ZooKeeper

5. How does Zookeeper ensure data consistency? What is the Zookeeper Leader election process like? (Zab protocol)

10 minutes to learn about ZooKeeper

6. What are the internal coding types of the Redis String type?

Nine data structures of Redis and their internal coding implementation

7. How does Redis implement distributed locks?

The most powerful implementation of Redlock:Redis distributed Lock

8. With RocketMQ, how to ensure that messages are not lost?

During the production phase, you need to catch the error of the message and resend the message. During the storage phase, you can configure the parameters related to disk flushing and replication to write messages to multiple copies of the disk to ensure that messages are not lost due to a Broker downtime or disk corruption. In the consumption phase, you need to send a consumption confirmation after dealing with all the consumer business logic.

9. With RocketMQ, how to ensure that messages are not consumed repeatedly?

To do a good job of idempotent processing when consuming, the common scheme is as follows: when sending messages, assign each message a globally unique ID. When consuming, first check whether the message has been consumed according to the ID. If not, update the data, and then set the consumption status to consumed.

10. What is the difference between a vertical table and a horizontal table?

Vertical split table: suitable for situations where a table has many fields, some fields in the previous table are separated and put into one or more tables separately.

Horizontal table: divide the data into different tables according to the specific segmentation rules.

11. The principle of consistent hashing algorithm

Consistent Hash algorithm in distributed data caching

12. The underlying principle of MySQL index

Index of MySQL

13. The principle of innodb engine MVCC

MySQL transaction isolation level and MVCC

14. MySQL returns to the table

There are two types of indexes in MySQL: clustered indexes and non-clustered indexes (also called secondary indexes).

The clustered index stores the complete row record data, while the non-clustered index stores only the data of the index column and the primary key id or row number (InnoDB is the bank number in the primary key id,MyISAM).

Returning to the table means that after filtering out the id or line number of qualified data rows from the secondary index, you can query the complete record rows in the cluster index or data file (InnoDB is looked up in the cluster index and MyISAM is looked up in the data file, so MyISAM does not have a cluster index). At this point, the study on "how to use RocketMQ to ensure that messages are not lost" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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