知鸦日报2022-02-21

积分是平台根据用户特定行为，根据某种规则发放的仅限平台内使用的等价物，一般平台内还会设计供给积分消费的商城。

我们于2021年初开始开发的在线客服系统，目前已经对接借款、理财、惠享等多个业务，并为其他公司业务提供第三方服务。本文以在线客服IM系统设计的思考过程为线索，介绍了在线客服IM系统的技术选型及设计思路。

优酷腐化治理系列文章第三篇。

随着网络基础设施的提升，UDP的传输准确率也得到了很大的提升，而TCP却因为20～60字节的头部以及可能的头部拥塞导致一定的效率降低，但是TCP协议已经被大量内置于操作系统内核中，因此只能利用UDP进行定制化。虽然QUIC可能会在小页面的性能不如TCP，但随着前端日益复杂化，资源量不断增大的情况下，使用QUIC替换TCP将能够显著提升传输速率。

放弃TCP而使用基于UDP的QUIC，有点类似早期x86cpu内置的tss硬件切换不好用，linux系统内核直接使用软件控制进程上下文切换。

随着公司业务快速发展，数据库中数据量猛增，访问性能变慢。关系型数据库本身比较容易成为系统瓶颈、单机存储容量、连接数、处理能力有限。所以要使用分库分表。

使用新的 CSS 特性，写出好的 CSS 代码。

高 JVM 内存使用率会降低集群性能并触发断路器错误（导致内存熔断）。

为了防止这种情况发生，如果节点的 JVM 内存使用率持续超过 85%，官方建议采取措施降低内存压力。

This blog post gives an overview of the Rapid Event Notification System at Netflix and shares some of the learnings gained while building it.

A story of evolving socio-technical workflows that increased developer velocity and redefined confident testing and deploy workflows at Slack.

In large organisations, it is a common practice to isolate the cloud resources of different verticals. Amazon Web Services (AWS) Virtual Private Cloud (VPC) is a convenient way of doing so. At Grab, while our core AWS services reside in a main VPC, a number of Grab Tech Families (TFs) have their own dedicated VPC. One such example is GrabKios. Previously known as “Kudo”, GrabKios was acquired by Grab in 2017 and has always been residing in its own AWS account and dedicated VPC.

In this article, we explore how we exposed an Apache Kafka cluster across multiple Availability Zones (AZs) in Grab’s main VPC, to producers and consumers residing in the GrabKios VPC, via a VPC Endpoint Service. This design is part of Coban unified stream processing platform at Grab.

Radio frequency Identification (RFID) as a technology has existed for a long time now. There are many applications of this technology in different domains and certainly a large portion applies to supply chain management as well. The applications of RFID in supply chain management has vast potential in improving effectiveness and efficiency. In this post we will cover a high level view of how RFID technology can be leveraged in the supply chain and specifically how we have leveraged this technology at Myntra to solve some complex problems. At Myntra we believe technology can democratise the way fashion is perceived and delivered. The below mentioned solutions are some in-depth work from the teams and most of it are currently deployed.

结构化分析，并非只有“分析”一步。而是包含了梳理问题、分析问题、解决问题三个步骤。所谓“好的问题是成功解答的四分之三”，正是此道。

博学而笃志，切问而近思，仁在其中矣。