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ninehills committed Jun 2, 2023
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ninehills.tech
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<!doctype html><html lang=en dir=auto><head><meta charset=utf-8><meta http-equiv=x-ua-compatible content="IE=edge"><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=robots content="index, follow"><title>九原山</title><meta name=description content><meta name=author content><link rel=canonical href=https://ninehills.tech/><link crossorigin=anonymous href=/assets/css/stylesheet.min.c88963fe2d79462000fd0fb1b3737783c32855d340583e4523343f8735c787f0.css integrity="sha256-yIlj/i15RiAA/Q+xs3N3g8MoVdNAWD5FIzQ/hzXHh/A=" rel="preload stylesheet" as=style><link rel=icon href=https://ninehills.tech/favicon.ico><link rel=icon type=image/png sizes=16x16 href=https://ninehills.tech/favicon-16x16.png><link rel=icon type=image/png sizes=32x32 href=https://ninehills.tech/favicon-32x32.png><link rel=apple-touch-icon href=https://ninehills.tech/apple-touch-icon.png><link rel=mask-icon href=https://ninehills.tech/safari-pinned-tab.svg><meta name=theme-color content="#2e2e33"><meta name=msapplication-TileColor content="#2e2e33"><meta name=generator content="Hugo 0.112.6"><link rel=alternate type=application/rss+xml href=https://ninehills.tech/index.xml><noscript><style>#theme-toggle,.top-link{display:none}</style><style>@media(prefers-color-scheme:dark){:root{--theme:rgb(29, 30, 32);--entry:rgb(46, 46, 51);--primary:rgb(218, 218, 219);--secondary:rgb(155, 156, 157);--tertiary:rgb(65, 66, 68);--content:rgb(196, 196, 197);--hljs-bg:rgb(46, 46, 51);--code-bg:rgb(55, 56, 62);--border:rgb(51, 51, 51)}.list{background:var(--theme)}.list:not(.dark)::-webkit-scrollbar-track{background:0 0}.list:not(.dark)::-webkit-scrollbar-thumb{border-color:var(--theme)}}</style></noscript><meta property="og:title" content="九原山"><meta property="og:description" content><meta property="og:type" content="website"><meta property="og:url" content="https://ninehills.tech/"><meta name=twitter:card content="summary"><meta name=twitter:title content="九原山"><meta name=twitter:description content><script type=application/ld+json>{"@context":"https://schema.org","@type":"Organization","name":"九原山","url":"https://ninehills.tech/","description":"","thumbnailUrl":"https://ninehills.tech/favicon.ico","sameAs":[]}</script></head><body class=list id=top><script>localStorage.getItem("pref-theme")==="dark"?document.body.classList.add("dark"):localStorage.getItem("pref-theme")==="light"?document.body.classList.remove("dark"):window.matchMedia("(prefers-color-scheme: dark)").matches&&document.body.classList.add("dark")</script><header class=header><nav class=nav><div class=logo><a href=https://ninehills.tech/ accesskey=h title="九原山 (Alt + H)">九原山</a>
<span class=logo-switches><button id=theme-toggle accesskey=t title="(Alt + T)"><svg id="moon" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"/></svg><svg id="sun" xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentcolor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="5"/><line x1="12" y1="1" x2="12" y2="3"/><line x1="12" y1="21" x2="12" y2="23"/><line x1="4.22" y1="4.22" x2="5.64" y2="5.64"/><line x1="18.36" y1="18.36" x2="19.78" y2="19.78"/><line x1="1" y1="12" x2="3" y2="12"/><line x1="21" y1="12" x2="23" y2="12"/><line x1="4.22" y1="19.78" x2="5.64" y2="18.36"/><line x1="18.36" y1="5.64" x2="19.78" y2="4.22"/></svg></button></span></div><ul id=menu></ul></nav></header><main class=main><article class=post-entry><header class=entry-header><h2>[MIT 6.824 分布式系统课程] Lab2 Raft 心得</h2></header><section class=entry-content><p>Raft struct 的成员 1 Raft 节点的角色，可以使用Go常量
const ( Follower = iota // 0 Candidate // 1 Leader // 2 ) 2 使用Buffered Channel进行异步通信，比如等待心跳包结果等情况，我定义了如下Channel
chanHeartbeat chan bool // 收到心跳 chanWinVote chan bool // 赢得选举 chanGrantVote chan bool // 获得选举票 chanApply chan ApplyMsg // 用来commit的channel 在Make()中需要初始化Channel为Buffered Channel
rf.chanWinVote = make(chan bool, 10) rf.chanGrantVote = make(chan bool, 10) rf.chanHeartbeat = make(chan bool, 10) 3 Raft struct大部分成员都是论文的Figure 2的内容
4 发送broadcastRequestVote后，需要进行voteCount 计数，以确定是否赢得Vote，所以 Raft struct需要增加voteCount成员
协程冲突问题 Raft有如下成员来进行加锁...</p></section><footer class=entry-footer><span title='2018-02-28 09:36:26 +0000 UTC'>February 28, 2018</span></footer><a class=entry-link aria-label="post link to [MIT 6.824 分布式系统课程] Lab2 Raft 心得" href=https://ninehills.tech/posts/ninehills-ninehills.github.io-300952316-post-62/></a></article><article class=post-entry><header class=entry-header><h2>解决 Mac Docker.qcow2 文件过大的问题</h2></header><section class=entry-content><p>背景：Docker on Mac 长时间运行后，Docker.qcow2就会变得很大，需要压缩
参考：https://github.com/docker/for-mac/issues/371
Author: yankcrime NB: You’ll need to install qemu via Homebrew as this process requires qemu-img to recompress the qcow2 disk image.
$ cd ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux
$ mv Docker.qcow2 Docker.qcow2.original
$ du -hs Docker.qcow2.original
12G Docker.qcow2.original
$ qemu-img convert -O qcow2 Docker.qcow2.original Docker.qcow2
$ rm Docker.qcow2.original
$ du -hs Docker.qcow2
772M Docker.qcow2 除此之外，还有一个根本解决问题的方法，就是不要在虚拟机内保存任何数据，全部使用Volume，这样当文件过大时，删除文件，重启Docker后，重新创建容器即可。
回复也记录下常用的一些容器的启动，用于备忘：
# jupyter with spark
docker run -p 8888:8888 -d -v /Users/baidu/WorkSpace/Jupyter:/home/jovyan/work --name all-spark-notebook jupyter/all-spark-notebook
# jupyter with go
docker run -p 8887:8888 -d -v /Users/baidu/WorkSpace/Jupyter:/go/workspace --name go-notebook dwhitena/gophernotes jupyter notebook --no-browser --ip=0....</p></section><footer class=entry-footer><span title='2017-07-13 02:21:52 +0000 UTC'>July 13, 2017</span></footer><a class=entry-link aria-label="post link to 解决 Mac Docker.qcow2 文件过大的问题" href=https://ninehills.tech/posts/ninehills-ninehills.github.io-242567191-post-3/></a></article><footer class=page-footer><nav class=pagination><a class=prev href=https://ninehills.tech/>« Prev Page</a></nav></footer></main><footer class=footer><span>&copy; 2023 <a href=https://ninehills.tech/>九原山</a></span>
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