五四陈科学院-相信科学，分享技术

The Young Chen Academy of Science

欢迎光临！You are welcome!

科学Science:

Cloud Computing

技术Technology:

Java,PHP,Python,C/C++,scala

相信科学，分享技术

Believing in science and sharing technology

2021 年 8 月 9 日

机房保障 olink.cloud 本文档 pdf 格式提供下载

目录 1

1 摘要 Abstract 2

2 序言 Introduction 2

3 第一阶段 The ﬁrst phase 3

4 第二阶段 The second phase 4

5 第三阶段 The three phase 5

6 总结 Conclusion 6

摘要

ABSTRACT

1 摘要Abstract

这是一份技术总结文档，作者在国内从事互联网技术行业 15 年以上，第一

篇技术日志从大学时期开始记录，在北京著名互联网公司的工作过程中，也一点

一滴地记录了一些遇到的技术问题，时间跨度超过 15 年。

技术领域涉及到 mysql、pgsql 等常见存储，更是横跨至复杂的深度神经网络

设计、云计算安全等领域，整体更偏工程一些。

如果将过去的时间分为前中后三段，前段时间主要在应用程序开发，涉及到

的主要是语言特性、应用配置技能。中段时间开始研究存储层的东西，更加关注

深层的细节。后段时间开始理解商业和管理，对团队理解、方法论、数据相关的

内容更多一些。

从所有的这些内容看下来，可以想象一个技术人，从技术爱好走向专业深度

诠释，亦可侧面感受行业浪潮对于技术的影响。

This is a summary tech document. The author worked in the internet industry of China for more than 15 years. I wrote the ﬁrst tech article when I was in university. When I

worked for famous tech companies in Beijing, I also recorded loads of tech issues.

The content is of more than 15 years’ duration. The tech domain contains normal storage such as mysql, pgsql etc. Moreover, there are some more complicated contents

including DNN design, security of cloud computing etc. Mostly, they are about engineering.

I divide history into three phases. In the ﬁrst phase, I focused on coding skills including various languages, applications conﬁguration skills etc. In the second phase, I worked

in the storage layer. There were more detailed and deeper contents. When it came to the third phase, business and management was the point. There were more things about

team management, methodology, data etc.

From all the articles, you can imagine the history of a tech person who grew up from a tech geek to a deep professional. You also can feel the impact of industry wave on

technology.

2 序言Introduction

从 1997 年开始讲起，当时的小霸王学习机简直是梦寐以求的配置了，冥冥

之中有一种对计算机键盘的追求，在 windows98 都还没出世的时候，我用小霸五

学习机学会了五笔输入法，从一开始就解决了一个南方人拼音不好的问题。

高中时我为班级开发了班级网站，有一些留言板和相册的功能，用了 asp

access，当时很多知识都需要从新华书店的计算机书里找答案，从此产生了对计

算机领域的深厚热情。

时间到了高考填写志愿的时候，机缘巧合遇到了云南大学的一位教授，旁边

的人说他是著名的“x 物理”（姓 x，是物理教授），我自豪的告诉他我所有的志愿

都是计算机科学与技术专业，不服从调剂。他说的一句话就让我非常失望了，“计

算机以后肯定是技术，是不是科学就不一定了”。

在第一阶段的计算机经历，更多的内容还是关于技术的，而非科学，大学校

园给了一个非常好的环境可以潜心写代码，课堂内容也将数据结构、系统结构、

编译原理等基础知识体系搭建起来。

在第二阶段，因为市场上常见的语言都已经摸了一遍，开始选择一个特定的

第一阶段

THE FIRST PHASE

方向，结合工作需要，进行深入的研究。

在第三阶段，平台发展要求个人能力多样化发展，简单的写代码已经不能为

企业所需要了，开始考虑团队级别的事情，更多的与人打交道，但依然对写代码

恋恋不舍，对事物的发展预判，数据的使用都有了更深的理解。

The Xiaobawang learning machine was my dream machine in 1997, which was a kind of machine like Gameboy with a computer-like keyboard. At that time, windows98 was

not ready. I learned the WUBI input method from the learning machine. That was good for a southern person who is always not good at PinYin.

When I went to high school, I developed a class website, which had bbs and album functions designed by asp and access. Lots of knowledge had to be found in the books,

which were in the XinHua bookstore. From that time, I began to learn computer technology with strong enthusiasm.

I met a professor of YunNan University when I graduated from high school. He said to me that computers could be technology but would not be science. I was disappointed

with that guy.

In the ﬁrst phase of my computer learning experience, it was more about technology, but not science. At the University campus, there was a good environment to study the

subject in more depth. The course of computer science was also building fundamental knowledge with data structure, system architecture, compiler theory etc.

In the second phase, I started to research a speciﬁc direction, which could combine with my work. I did more research on the work details.

In the third phase, the company required further management. With the development of the platform, coding is not the most important thing for me. I began to think about

teamwork, and had more time to talk with others. Even though I have no time to develop projects, I still miss the feeling of coding. At that time, I obtained the skills of

analysing.

3 第一阶段The ﬁrst phase

2005 年，写下了第一篇 (Chen, 2005)，记录了 mysql 的字段的长短，以及怎

么给 mysql 用户加减权限，后来又补充了一篇 (Chen, 2006e)，都非常实用。后来

工作了，又有机会进行了 postgreSQL 的文档补充，包括 (Chen, 2008p) 介绍了安

装，(Chen, 2008l) 添加了权限设置，(Chen, 2008k) 和 (Chen, 2008o) 以及 (Chen,

2008s) 增加了集群方案 pgpool 和 plproxy 的安装和配置，(Chen, 2008u) 记录了一

些 pgsql 的常见问题，包括数据同步问题。早期的日志是记录在百度 hi 空间里，

这导致了时间上只是个大概，并不十分准确。

还有一些内容是关于操作系统的应用，(Chen, 2006d) 是在 gnome 下的 gtk 代

码，通过一系列的文章，包括 Linux(Chen, 2006c)，汇编 (Chen, 2006b)，网络 (Chen,

2006g)，反编译 (Chen, 2007a)，C 语法 (Chen, 2008h)，协议抓包 (Chen, 2008y)，最

终推出了当时在校园里大家都要用的拨号软件 myNet，并将代码进行了详细的分

析，连载文章见 (Chen, 2008a, 2008b, 2008c, 2008d)，现在看当时技术水平还挺在

线的。

还有很多与服务器端相关的配置经验总结，包括 Apache(Chen, 2006a)，NFS

配置 (Chen, 2006f)，JQuery(Chen, 2008i)，smartDNS(Chen, 2008w)，PHP 收发邮

件 (Chen, 2008m)，SSH(Chen, 2008x)，配置管理工具 Cobbler(Chen, 2009t)，ipta-

bles(Chen, 2009q)，这阶段的配置经验，其实在网络上都可以找到，不同的是记

录下的都是当时实验成功的。

这阶段还有一些关于不同语言细节的，包括 Perl(Chen, 2008j)，VB(Chen,

2008t)，PHP(Chen, 2008n)，还有一些关于 C 的细节，入门的有 (Chen, 2008v)，深

入的有如 sscanf(Chen, 2008q)，PHP 内核里的 TSRM_CC (Chen, 2008f)，技术分

布在偏 C、PHP 的角度，也是当时的技术趋势。

第二阶段

THE SECOND PHASE

也有一些早期关于创业的思考和文摘，他们是 (Chen, 2007b)，BBS 发展

(Chen, 2008e)，除此之外还有一些转载过来或者会议记录的优秀架构或者发展

过程的文章，他们是人人网的架构 (Chen, 2009a)，手机之家 (Chen, 2009p)，雅

虎和淘宝当时怎么用 Hadoop(Chen, 2009l)，GIS 相关技术 (Chen, 2009f)，一个大

列表 (Chen, 2008z) 现在多半打不开了，用 PHP 搞当时很流行的开放平台 (Chen,

2008r)。

I wrote the ﬁrst article (Chen, 2005) to record the length of mysql ﬁelds and the method of ﬂushing privileges of mysql. Later, I enclosed the second one (Chen, 2006e). Both

of them are useful. After working in the ofﬁce, there are more articles about PostreSQL including installation(Chen, 2008p), permissions settings (Chen, 2008l), Pgpool and

Plproxy for the usage of cluster (Chen, 2008k, 2008o, 2008s), common issues (Chen, 2008u). The date of these articles were not accurate because they were transferred from

Baidu Hi.

Some more articles were about operation systems. The ﬁrst one is about gtk coding in gnome (Chen, 2006d). A series of articles described the 802.1x client on Linux,

including Linux (Chen, 2006c), assembler programming (Chen, 2006b), networking (Chen, 2006g), decompilation of C(Chen, 2007a), C language (Chen, 2008h), protocol

cracking (Chen, 2008y). A client named myNet was used on campus for the 802.1x protocol. The introduction of it was shown in articles in serial form (Chen, 2008a, 2008b,

2008c, 2008d).

There were a lot of articles to describe the server conﬁguration, including Apache (Chen, 2006a), NFS (Chen, 2006f), jQuery (Chen, 2008i), smartDNS (Chen, 2008w), php

mailer (Chen, 2008m), SSH (Chen, 2008x), Cobbler (Chen, 2009t), iptables(Chen, 2009q). All of the articles were tested by myself.

Different languages were showed in this phase, including Perl (Chen, 2008j), VB(Chen, 2008t), PHP(Chen, 2008n). There were also some details of C, including basic

knowledge (Chen, 2008v), research on sccanf (Chen, 2008q), TSRM_CC in PHP (Chen, 2008f). All of them were the trend of technology at that time.

There were also some articles about startup, including cases (Chen, 2007b), development of BBS (Chen, 2008e). Some articles were from other websites or famous architecture,

including RenRen (Chen, 2009a), mobile home (Chen, 2009p), the usage of hadoop in Yahoo and Taobao (Chen, 2009l), GIS (Chen, 2009f), a list (Chen, 2008z), open platform

by PHP (Chen, 2008r).

4 第二阶段The second phase

第二阶段，花了大量的时间在存储技术，搜索技术，技术细节上，Berkeley

DB 的收藏 (Chen, 2008g)，java 使用 bdb(Chen, 2009i, 2010g)，一系列 kv 相关的，

memcached(Chen, 2009o)，Discuz BBS 的缓存设计 (Chen, 2009b)，当时很流行的

TC(Chen, 2009s)，用 java 压力测试 TC(Chen, 2009r)，设计人人网分布式存储时的

思考 (Chen, 2009m)，linkedin 的 dynamo 实现伏地魔 voldemort(Chen, 2009j)，分

布式存储的开发心得 (Chen, 2010l)，这篇在淘宝推出 oceanbase 的时候做了些记

录 (Chen, 2011j)，还有这篇国内互联网公司的数据连接方案也不错 (Chen, 2010e)，

另外这篇是《程序员》杂志的稿子，讲的是在人人网开发 nuclear 分布式存储的

过程和心得 (Chen, 2010f)。

关于中文全文检索，当时记录了比较好用的 pgsql+bamboo 的方案，连载文

章见 (Chen, 2009c, 2009d, 2009e)，当时的 sphinx 也很流行 (Chen, 2010c, 2010h,

2010i)，当时还用 sphinx 做了一次二度好友的推荐 (Chen, 2010j)。

很多内容由浅入深的在探讨技术细节，这篇是研究 mysql 的索引技术 (Chen,

2010d)，常见的 jdbc 的 io 锁原理 (Chen, 2010b)，根据系统负载决定代码运行的

实现，在做一些后台任务时非常有用 (Chen, 2010a)，如何精准控制用户上传的文

档类型 (Chen, 2009k)，JAVA 的 list 转 byte 数组的研究 (Chen, 2009g)，java 并发

编程的原理 (Chen, 2009n)。当时 PHP 和 Java 是无缝切换的，在工作中都要用，

这篇研究了 PHP 里 call_user_func(Chen, 2010k)。这篇还介绍了当时比较出名的

hashdos 攻击的各种补救和原理 (Chen, 2011i)，这篇直接在 nginx 做了点改动达到

防备效果 (Chen, 2012i)，

第三阶段

THE THREE PHASE

C 环境的问题总是很奇特，所以选了其中 3 篇，MAC 开发更新 gcc(Chen,

2015b)，C++ 的 protobuf 有一个很难查的 Core Dump 坑 (Chen, 2016a)，C++ 的

SHA1WithRSA/ras/X509 怎么写逻辑 (Chen, 2016b)。

In the second phase, I spent a lot of time on storage, search engine, details of technology. Berkeley DB was researched in some articles (Chen, 2008g, 2009i, 2010g). A series

of articles about KV storage were shown in serial form, including memcached (Chen, 2009o), the cache design of Discuz BBS (Chen, 2009b), TC storage (Chen, 2009s),

load test of TC by java (Chen, 2009r). There were some considerations of the design of RR distributed storage system (Chen, 2009m) and the development summary (Chen,

2010l). Some other famous companies also had the details of storage, including voldemort from Linkedin (Chen, 2009j), OceanBase from Taobao (Chen, 2011j), general

summary from domestic companies (Chen, 2010e). An article was published in the CSDN journal describing the experiences and reﬂections of Nuclear distributed storage

system (Chen, 2010f).

Chinese fulltext search was also a hot issue. PostgreSQL with Bamboo is a good design (Chen, 2009c, 2009d, 2009e). Sphinx was also very popular (Chen, 2010c, 2010h,

2010i). I used sphinx to design a case of people you may know (Chen, 2010j).

A large amount of contents were talked about the technique details, including index technology of mysql (Chen, 2010d), common theory of IO locking in JDBC (Chen, 2010b),

accurate control of the uploading ﬁle type (Chen, 2009k), research of List and byte array in Java (Chen, 2009g), theory of concurrent programming (Chen, 2009n). Running

different codes by the different system load situation was very useful when you needed to design some task running background (Chen, 2010a). I had to use both Java and

PHP in the ofﬁce. This article researched the call_user_func in PHP (Chen, 2010k). HashDos attack was very popular at that time, so here was the explanation and prevention

(Chen, 2011i), and the changing of ngnix to prevent the attack was also uploaded (Chen, 2012i).

C environment was always special, so there were three articles describing it, including updateing gcc on Mac (Chen, 2015b), a core dump issue with c++ and protobuf (Chen,

2016a), the Sha1WithRSA/ras/X509 in C++ (Chen, 2016b).

5 第三阶段The three phase

第三阶段的内容比较繁杂，有深有浅，也有方法论。Erlang 快速入门 (Chen,

2011a)，然后开始从安装到压力测试再到核心源码，连载研究一个叫 Riak 的分布

式存储 (Chen, 2011b, 2011c, 2011d, 2011e, 2011f, 2012j, 2012z)。

Rose 框架使用手册连载，历时 3 个多月 (Chen, 2012k, 2012l, 2012m, 2012n,

2012o, 2012p, 2012q, 2012r, 2012s, 2012t, 2012u, 2012v, 2012w, 2012x)。

cloud foundry 代码阅读手记, 记录了所有的 ruby 学习 (Chen, 2012y)、cf 代

码学习、服务器虚拟化文案 warden 细节，用时大概 2 个月 (Chen, 2012a, 2012b,

2012c, 2012d, 2012e, 2012f, 2012g, 2012h)。

有段时间公司开始成立 IoT 业务，于是就开始研究开源硬件，就有了一系列

的 Arduino 开源硬件的学习手记，由浅入深分别是 (Chen, 2013c, 2013d, 2013e)，

后来因为无线控制的需要，研究了各种 Arduino 的无线控制方案 (Chen, 2013a)，

最终用上了低功耗蓝牙 (Chen, 2013b)，集成的板子 BLUNO(Chen, 2013f)。

公司进入平台期，各项技术趋于稳定，于是有大把的时间开始总结，就有了

一系列的连载文章，记录了在小米六七年时间创业期的技术总结 (Chen, 2016c,

2016d, 2016e, 2016f, 2016g)。

因为有很长一段时间一直在研究网络层，于是便有了大量的关于 IO 的文章，

socket read 在各层的理解 (Chen, 2014k)，移动网络 (Chen, 2014l)，移动互联网系

统架构陷阱 (Chen, 2013j)，JAVA 的 IO 理解 (Chen, 2009h, 2014c, 2015a)，怎么压

力测试 IO(Chen, 2014m)，facebook thrift 相关的也不少，用 disruptor 实现的 nio

的压力测试 (Chen, 2014b)，cassandra 是怎么用 thrift 的 (Chen, 2013g)，早期版

本的 thrift 升级有大坑 (Chen, 2014h)，用 resin 组合对 thrift 进行压力测试 (Chen,

2013h)，也有 thrift 的入门教程 (Chen, 2011g, 2011h)。

IM 领域，一直在研究接入层，于是有一系列的相关文章，调研一系列的协议

总结

CONCLUSION

Bosh、Comet、longpolling 之类的 (Chen, 2014a)，java 的 xmpp 实现之一的 Tigase

分析 (Chen, 2014i, 2014j)。

Scala 也在一段时间里保持着在分布式服务处理的重要角色，于是也有一系

列的文章记录，入门手记 (Chen, 2013i)，akka 是 scala 的 actor 模型，一系列的实

用连载，用 java 调用 akka，可以在线上使用 (Chen, 2014d, 2014e, 2014f, 2014g)。

在人工智能如火如荼的时代，也不能少了一系列的文章，利用 keras 和 ten-

sorﬂow 完成支付风控 (Chen, 2017c)，一些基础知识包括优化器、激活函数、评价

函数等 (Chen, 2017b)，Caffe 的使用入门 (Chen, 2017a)。

关于团队管理和整体技术架构，也有一些文章记录了最近的变动。这篇是一

篇关于团队目标和 OKR 相关的 (Chen, 2019)。微服务架构很流行，这些文章都是

相关的记录 (Chen, 2018a, 2018b, 2018c).

In the third phase, the articles were complicated, which are about deep explanations and methodology. An article was about Erlang quick starting (Chen, 2011a). Then a

project named Riak, which was a distributed storage system, was researched by a series of articles from installation to load testing and core source codes (Chen, 2011b, 2011c,

2011d, 2011e, 2011f, 2012j, 2012z).

I spent more than 3 months on Rose manual, which was a famous web framework base Java Spring (Chen, 2012k, 2012l, 2012m, 2012n, 2012o, 2012p, 2012q, 2012r, 2012s,

2012t, 2012u, 2012v, 2012w, 2012x). And I spent more than 2 months on research of Cloud Foundry. They were the learning of Ruby (Chen, 2012y), the learning of CF and

Virtualization named Warden (Chen, 2012a, 2012b, 2012c, 2012d, 2012e, 2012f, 2012g, 2012h).

Because the company started the IoT business, I started the research of open hardware. There were some research results of Arduino (Chen, 2013c, 2013d, 2013e). When it

came to the wireless methods, various control cases were researched (Chen, 2013a), and at last I chose the low power bluetooth (Chen, 2013b) and the integrated resolution

BLUNO (Chen, 2013f).

When the company was not in such a busy situation, I started to review the history of development in XIAOMI. So there were lots of technique summaries in XIAOMI,

recording the history of startup period in XIAOMI (Chen, 2016c, 2016d, 2016e, 2016f, 2016g).

Because I spent a lot of time on networking, there were some articles about IO, including the understanding of socket read on different layers (Chen, 2014k), mobile networking

and architecture (Chen, 2013j, 2014l), understanding of Java IO (Chen, 2009h, 2014c, 2015a), load testing of IO (Chen, 2014m). Some articles were about Facebook Thrift,

including load testing by the disruptor nio (Chen, 2014b), the usage of Thrift in Canssandra (Chen, 2013g), the version upgrade of early Thrift (Chen, 2014h), load testing by

Resin and Thrift (Chen, 2013h), and the quick start of Thrift (Chen, 2011g, 2011h).

In the instant messaging domain, I focused on the access layer. There were some articles about protocols such as Bosh, Comet, Long polling (Chen, 2014a). I researched the

Java version of XMPP implementation named Tigase (Chen, 2014i, 2014j).

Scala played an important role in distributed systems in a particular period, so there were a series of articles about it. For example, the learning of Scala (Chen, 2013i). Akka

was the Actor model designed by Scala, which could be used online by Java (Chen, 2014d, 2014e, 2014f, 2014g).

In the period of AI, the articles about AI were also very useful. There was an example of using Keras and tensorﬂow to control the payment risk (Chen, 2017c). There were

an article about basic knowledge such as Optimizers, Activation (Chen, 2017b) and the learning of Caffe (Chen, 2017a).

About the team management and entire architecture, there were some articles. This was a article about the team objective and OKR (Chen, 2019). Because micro-service

architecture was popular, these articles were about it(Chen, 2018a, 2018b, 2018c).

6 总结Conclusion

还有很多零碎有用的内容没有在这里一一进行总结，比如说怎么在北京生孩

子之类的 (Chen, 2017d)，像这篇对区块链的研究 (Chen, 2018d)，研究信息可视化

的结果 (Chen, 2021)，技术之余，这些知识都对个人的生活影响比较大，觉得对

大家会有用处，于是也做了记录。

以上精选纯为个人归总，也许有有用的文章并未并归纳进来，个人视野有

限，如有想添加的请查找公众号 java_scala。

以上内容，能力有限，如有缺陷，万望指出。

There are still some useful articles which are not shown here. For example, this article explained how to born a child in Beijing (Chen, 2017d), this article explained the

blockchain (Chen, 2018d), this article is the research result of information visualisation (Chen, 2021). All of these contents were useful in common life.

The above recommendations are up to me. It is clear that my mind is limited and if you have any ideas about that, you can contact me by the Wechat Ofﬁcial Account:

java_scala.

Any suggestions about this ﬁle would be appreciated！

REFERENCES

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Chen, Z. (2006a). Apache 常用设置 - 五四陈科学院. https://www.54chen.com/blog/

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Chen, Z. (2006b). Intel 汇编与 at ＆ t 的区别 - 五四陈科学院. https://www.54chen.

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