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Introduction: explore RocketMQ source code - Series1: transaction messages from the perspective of Producer 1. Preface Apache RocketMQ, as a well-known open source messaging middleware, was born in Alibaba and donated to Apache in 2016. From RocketMQ 4.0 to the latest v4 7.1 Alibaba has won wide attention and praise both inside and outside th ...

catalogue   Use type script Type scripts enforce type safety Type descriptions make it possible to refactor larger applications Type scripts make team architecture communication easier Use modern features Synchronization and waiting Jean and conster Arrow = = function Propagation operator Template font (template string) Object const ...

1. Foundation 1. Basic knowledge LVM (Logical Volume Manager) logical volume management is a logical layer added between the disk partition and the file system to shield the lower disk partition layout for the file system, provide an abstract disk volume, and establish the file system on the disk volume. With LVM, the administrator can dyn ...

Density based approach: DBSCAN Visual website: https://www.naftaliharris.com/blog/visualizing-dbscan-clustering/ DBSCAN = Density-Based Spatial Clustering of Applications with Noise This algorithm divides the region with high enough density into clusters, and can find clusters of any shape Several concepts 𝛆 neighborhood: the area w ...

What is Ajax Ajax: asynchronous JavaScript and XML. AJAX is a technology used to create fast and dynamic web pages. Ajax can make web pages update asynchronously by exchanging a small amount of data with the server in the background. This means that a part of the web page can be updated without reloading the whole web page, while the tradition ...

Using std::unique_ptr manages resources with exclusive ownership Whenever you need to use a smart pointer, std::unique_ptr is basically the most appropriate. You can think that by default, std::unique_ptr is equivalent to the original pointer, and for most operations (including dereference), they execute exactly the same instructions. This mea ...

1, What is shiro Apache Shiro is a powerful and easy-to-use Java security framework that performs authentication, authorization, password, and session management. With Shiro's easy to understand API, you can get any application quickly and easily, from the smallest mobile application to the largest network and enterprise application. Develop ...

Reprint address: https://l1905.github.io/php/2020/02/28/macos-pecl-xdebug-mongodb/ Error in installing php extension for macos higher version Published on February 28, 2020 | classified in php Install php extension xdebug, mongodb Analysis of error reporting in installing php extension on mac background Machine: mac os catalina Version: 10.15. ...

Learning latent variables using self encoder Because there are many redundancies in the high-dimensional input space, it can be compressed into some low-dimensional variables. The self encoder was first introduced by Geoffrey Hinton et al. In the 1980s. Similar to the technology used to reduce the input dimension in traditional machine lea ...

summary hashilib digest encryption There are only two kinds of hash digest (encryption) algorithms: md5 and sha-x series Characteristics of hash encryption The digest generated by hash algorithm is irreversible. (the original text cannot be obtained through encrypted text)Only the same data can be summarized by the same algorithmNo matter h ...