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This article mainly introduces the relevant knowledge of "what are the advantages of MQ". The editor shows you the operation process through actual cases, the operation method is simple and fast, and it is practical. I hope this article "what are the advantages of MQ" can help you solve the problem.

Benefit one: decoupling

It is extremely difficult to predict what requirements the project will encounter in the future at the beginning of the project. The message system inserts an implicit data-based interface layer in the middle of the processing process, and both sides of the processing process should implement this interface. This allows you to extend or modify the processes on both sides independently, as long as you make sure they follow the same interface constraints.

For example, in our payment deduction business scenario, the user generates an order and sends the MQ back immediately, and the settlement system consumes the MQ to deduct the amount of the user's account. In this way, the order system only needs to focus on the successful creation of the order, increase the order quantity as much as possible, and return to the user immediately after the order is generated. The settlement system is mainly concerned with the deduction of the account amount to ensure that the account amount is ultimately the same.

Benefit two: redundancy

In some cases, the process of processing data will fail. Unless the data is persisted, it will be lost. MQ persists data until it has been fully processed, avoiding the risk of data loss. In the insert-get-delete paradigm adopted by many MQ, before deleting a message from the queue, you need your processing system to clearly indicate that the message has been processed to ensure that your data is safely saved until you have finished using it.

Benefit 3: scalability

Because MQ decouples your processing, it's easy to increase the frequency of queuing and processing of messages, as long as you add additional processing. For example, DMS distributed message service does not need to change the code or adjust the parameters. Expanding is as simple as turning up the power button.

Benefit 4: flexibility and peak processing power

In the case of a sharp increase in traffic, applications still need to continue to play a role, but such sudden traffic is not common; it is undoubtedly a huge waste to put resources on standby to be able to handle such peak visits. The use of MQ enables key components to withstand sudden access pressures without completely collapsing due to sudden overloaded requests.

Or take the order system and settlement system scenario as an example, if the order system calls the settlement system through the RPC framework, the amount of orders generated in the case of peak promotion will be very large, and because the speed of generating orders is also very fast, it is bound to cause system pressure on the settlement system, server utilization will be on the high side, but the order quantity is relatively small at the non-peak time. The server utilization of the settlement system will be on the low side. For the settlement system, there will be the following peak and trough phenomenon chart.

Then if the order is stored in the MQ queue through MQ, and the consumer side is pulled, and the pull speed is controlled by the consumer side, the traffic can be controlled to stabilize. In this way, for the settlement system, it achieves the goal of cutting peaks and filling valleys. Or talk about the goal of flow control.

Benefit five: recoverability

When some components of the system fail, the whole system will not be affected. MQ reduces the coupling between processes, so even if a process that processes messages dies, messages added to the queue can still be processed after the system recovers.

Benefit 6: sequence assurance

In most usage scenarios, the order of data processing is important. Most MQ are inherently sorted and guarantee that the data will be processed in a particular order. Kafka guarantees the ordering of messages within a Partition.

Benefit 7: buffer

In any important system, there will be elements that require different processing times. For example, loading an image takes less time than applying a filter. Message queuing uses a buffer layer to help tasks perform as efficiently as possible-the processing of writing to the queue is as fast as possible. This buffer helps to control and optimize the speed at which data flows through the system.

Benefit 8: asynchronous communication

In many cases, users do not want or need to process messages immediately. Message queuing provides an asynchronous processing mechanism that allows users to put a message on the queue, but does not process it immediately. Put as many messages as you want in the queue, and then process them when needed.

For the system, the MQ message queuing mechanism can withstand greater access pressure; for the architecture, loose coupling, the system maintainability is convenient; and for users, want faster system access, better system experience, the natural choice of DMS!

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