Watchman

【微服务架构】调用链追踪系统对比

拥有回忆 提交于 2019-12-13 10:47:35
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 概述 当代的互联网服务,通常都是用复杂的、大规模分布式集群来实现的。互联网应用构建在不同的服务集上,这些服务有可能是由不同的团队开发、可能使用不同的编程语言来实现、有可能布在了几千台服务器,横跨多个不同的数据中心。因此,需要一个用于分析性能问题的系统可以监控那些横跨了不同的应用、不同的服务器之间的关联动作,调用链追踪系统应运而生。 目标 分布式调用链追踪系统一般有以下五个目标: 低消耗(low-overhead)调用链追踪埋点不能占用链路上太长的时间,也不应消耗太多的机器资源。 低侵入(low-invasiveness)作为非业务组件,应当尽可能少侵入或者不侵入其他业务系统,保持对使用方的透明性,减少开发人员的负担和接入门槛。 可扩展(scalability)整个调用链追踪通路都应该可扩展,以应对不断接入的服务和公司未来的发展。 时效性(time-efficient)从追踪数据采集,分析处理,查询,展示的整个通路都要尽量快速。 决策支持(decision-support)需要为业务定位问题,分析服务,提供丰富清晰的报表。 功能 调用链追踪系统通常包含的功能如下: 对调用请求的整个链路进行追踪,分析每个环节的耗时,协助开发运维人员找到性能瓶颈 找出服务之间的依赖拓扑关系,如每个服务依赖哪些服务

jest --watch (npm t — --watch) throwing errors

浪尽此生 提交于 2019-12-11 06:13:27
问题 node[1265] (FSEvents.framework) FSEventStreamStart: register_with_server: ERROR: f2d_register_rpc() => (null) (-22) This happens when running npm t -- --watch . On my system node v7.4.0 it works fine. On my fellow coworker (node v7.9) it fails. This question here asks the exact problem: Testing with Jest failed with Error: Error watching file for changes: EMFILE However the fix "install watchman" didn't work. We did brew install watchman then brew postinstall watchman Then when trying to run

React Native STUCK starting packager

纵然是瞬间 提交于 2019-12-08 15:55:52
问题 For some reason when I want to start my React Native project, it's stucks at 'Starting Packager...' part. I tried to delete the node packages, and reinstall them, intall them via yarn, npm, but no luck. I got no idea how should I fix this :/ (so awkward) 回答1: I had the same issue. I solved it by changing react-native-scripts version from "^1.14.1" to "1.14.0" and run npm install again. 回答2: after a long search I found a solution for this problem: this problem is caused by another watchman

watchman.plist permission denied when running a react-native initial project

旧城冷巷雨未停 提交于 2019-12-07 05:25:57
问题 I'm start using react-native and I followed the tutorials on the website, but when running the example project, it returned some error messages on the terminal: Looking for JS files in /Users/username/Desktop/nativeTest/BookSearch [06:03:00] <START> Building Dependency Graph [06:03:00] <START> Crawling File System [06:03:00] <START> Loading bundles layout [06:03:00] <END> Loading bundles layout (0ms) React packager ready. 2015-12-13T06:03:01,281: [cli] Failed to open /Users/username/Library

Watchman crawl failed. Retrying once with node crawler

大城市里の小女人 提交于 2019-12-05 00:09:51
问题 Watchman crawl failed. Retrying once with node crawler. Usually this happens when watchman isn't running. Create an empty .watchmanconfig file in your project's root folder or initialize a git or hg repository in your project. Error: watchman --no-pretty get-sockname returned with exit code=1, signal=null, stderr= 2018-03-23T11:33:13,360: [0x7fff9755f3c0] the owner of /usr/local/var/run/watchman/root-state is uid 501 and doesn't match your euid 0 回答1: You're running watchman as root but the

What are the performance and reliability implications of watching too many files?

强颜欢笑 提交于 2019-12-04 07:09:43
问题 In Facebook's Watchman application, somewhere in the docs it says this: Most systems have a finite limit on the number of directories that can be watched effectively; when that limit is exceeded the performance and reliability of filesystem watching is degraded, sometimes to the point that it ceases to function. This seems vague to me. Before it "ceases to function", what exactly can I expect to happen if I start watching too many files? And are we talking 100 files, 1,000 files, 100,000

Can't link pcre thru brew in max os yosemite

心已入冬 提交于 2019-12-03 09:48:06
问题 When I install watchman using brew install watchman , it got this Error: You must brew link pcre before watchman can be installed . So I try brew link pcre and brew link --overwrite pcre , I just got linking /usr/local/Cellar/pcre/8.36... Error: Could not symlink share/man/man3/pcre.3 /usr/local/share/man/man3 is not writable. Can anyone help? 回答1: By design Homebrew (brew) requires the contents of /usr/local to be owned by you. You can fix it easily by running: sudo chown -R `whoami` /usr

npm ERR! Failed at the project@0.0.1 start script &#039;react-native start&#039;

匿名 (未验证) 提交于 2019-12-03 02:03:01
可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效,请关闭广告屏蔽插件后再试): 问题: npm -v : 3.10.10 react-native -v :0.1.7 node -v : v6.9.5 ubuntu: 16.04 watchman -v : 4.5.0 Afrer executing react-native init project cd project and react-native run-android ,When i execute npm start to run server i have this error : project@0.0.1 start /home/sofiane/projet/merde2 > react-native start Cannot parse yarn version: 0.22 Scanning 547 folders for symlinks in /home/sofiane/projet/project/node_modules (3ms) ┌――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――┐ │ Running packager on port 8081. │ │ │ │ Keep

Can't link pcre thru brew in max os yosemite

Deadly 提交于 2019-12-02 23:05:19
When I install watchman using brew install watchman , it got this Error: You must brew link pcre before watchman can be installed . So I try brew link pcre and brew link --overwrite pcre , I just got linking /usr/local/Cellar/pcre/8.36... Error: Could not symlink share/man/man3/pcre.3 /usr/local/share/man/man3 is not writable. Can anyone help? Kuba By design Homebrew (brew) requires the contents of /usr/local to be owned by you. You can fix it easily by running: sudo chown -R `whoami` /usr/local from your Terminal. See here for further explanation. Wang Kevin first sudo chown -R 'your name'

watchman: I am missing file deletions happening before subscription

佐手、 提交于 2019-12-02 17:17:28
问题 I am missing deletes in watchman. Version 4.9.0, inotify. My test code: #!/usr/bin/env python3 import pathlib import pywatchman w = pywatchman.client() w.query('watch', '/tmp/z') clock = w.query('clock', '/tmp/z')['clock'] print(clock) q = w.query('subscribe', '/tmp/z', 'Buffy', {'expression':["since", clock], "fields": ["name", "exists", "oclock", "ctime_ns", "new", "mode"]}) print(q) f = pathlib.Path('/tmp/z/xx') f.touch() data = w.receive() clock = data['clock'] print() print('Touch file:'