By Alibaba Cloud ApsaraDB Team
During Alibaba's 2018 Double Eleven Shopping Festival, Proxy and Jushita, an Alibaba Cloud ApsaraDB for RDS product, supported a peak of several millions of QPS. There are often cases that tens of thousands of people competing for the same coupon or many people buying the same commodity simultaneously, which can lead to a database pain point known as high concurrency.
As one of the most important safeguards of Double Eleven every year, the Alibaba Cloud ApsaraDB for RDS department deals with high concurrency through parameter optimization, link access, elastic scaling, and architecture design. This allows the Alibaba e-commerce platform to support scenarios such as flash sales, ensuring a smooth Double Eleven experience for all users.
So how are the corresponding technologies implemented? This article will reveal the secrets of the Alibaba Cloud RDS database technologies behind the Double Eleven shopping festival.
When dealing with "high concurrency" scenarios, some specific database parameters become the key to ensuring rapid response to and smooth handling of the "high concurrency" issues. Some of the most important parameters are:
For example, the parameter settings and effects in the flash sales scenario are as follows:
When a flash sale starts, we can see that the number of connections instantly increases by 10 times.
Before adjusting the parameters, we can see that the RUN value is very high, which will cause an alarm of the database.
After adjusting the parameters, the UPD value and the RUN value improves dramatically.
In terms of link access, we provide a more secure database proxy access mode that users can turn on/off at any time as needed. The specification of the database proxy is automatically managed by the RDS system. It can be adaptively adjusted according to the load size while ensuring resource isolation among tenants. The database proxy is transparent to and has no effect on the app. It does not require manual intervention, which greatly reduces the O&M costs.
As shown in the following figure:
The database proxy is located between the application (Client) and the database engine, and is automatically maintained by the RDS system. All database requests and responses are processed by the proxy.
Currently, the database proxy supports the following features:
There are two database upgrade types: local upgrade and cross-server upgrade.
Cross-server upgrade requires the migration of backup data and logs
This may be caused by cross-server migration. The migration time is determined by the database size and the system pressure.
Both cases involve cross-server migration.
Space upgrade does not require restarting or migrating the database.
We recommend that you upgrade your database during the off-peak period and after the last backup task is completed.
In response to the growing volume of Double Eleven purchasing and warehousing data, RDS designed a new architecture for each supported database.
As shown in the following table, in terms of engine selection, ApsaraDB for RDS currently supports 4 relational database engines, providing comprehensive solutions, such as disaster tolerance, backup, recovery, and monitoring:
RDS has a built-in read/write splitter, which makes it more convenient for users to use.
In addition, security has always been the biggest concern for sellers and buyers. During the shopping festival, you don't want your product information or purchase information to be exposed to security risks. To address this concern, RDS has multiple security protections and designs in place:
The RDS team has also re-optimized the database performance, so that sellers and buyers do not have to be worried about the performance and security of the database. This allows them to fully enjoy the Double Eleven Global Shopping Festival.
To learn more about Alibaba Cloud ApsaraDB's family of databases, visit www.alibabacloud.com/product/apsaradb
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