README.md

Sky Walking
==========

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<img src="http://wu-sheng.github.io/sky-walking/images/skywalking.png" alt="Sky Walking logo" height="90px" align="right" />

SkyWalking: Large-Scale Distributed Systems Tracing Infrastructure, also known Distributed Tracer。

[![Build Status](https://travis-ci.org/wu-sheng/sky-walking.svg?branch=master)](https://travis-ci.org/wu-sheng/sky-walking)
![license](https://img.shields.io/aur/license/yaourt.svg)

# Abstract
* An open source Large-Scale Distributed Systems Tracing Infrastructure, also known a ditributed tracer.
* Based on [Google Dapper Paper: Dapper, a Large-Scale Distributed Systems Tracing Infrastructure](http://research.google.com/pubs/pub36356.html), [Simplified Chines](http://duanple.blog.163.com/blog/static/70971767201329113141336/)
* Supports popular rpc frameworks, such as [dubbo](https://github.com/alibaba/dubbo), [dubbox](https://github.com/dangdangdotcom/dubbox), [motan](https://github.com/weibocom/motan) etc., supports email-alert when application occurs unexpected exception。
* Execution time of creating span than 100μs.
* By using [byte-buddy](https://github.com/raphw/byte-buddy) (Thanks to [raphw](https://github.com/raphw)), plugins use dynamic byte code generation to avoid invasive codes. plugins API, execution time of blocking saving span must between 200μs and 300μs, including execution time of dynamic byte code.
* By using [DataCarrier](https://github.com/wu-sheng/DataCarrier), provide parallel high-throughput processing capability.
* Provide trace log analysis and presentation capabilities, Reduce or avoid add-on functions development.

# Supported components
* web container
  * Tomcat7
  * Tomcat8
* database
  * mysql
  * oracle
  * h2
  * easily extend to support sybase, sqlserver, jtds, db2, informix
* rpc framework
  * dubbo (tested 2.5.3)
  * dubbox (tested 2.8.4-dubbo protocol, 2.8.4-rest protocol)
  * httpClient 4.x
  * motan (tested 0.1.2)
* cache
  * jedix 2.x
* java local method
	* config package name or class name (Recommend to use in dev or test enviroment. Will cost too many in product enviroment.)


# Contributors
* 吴晟 [wusheng](https://github.com/wu-sheng) &nbsp;&nbsp;wu.sheng@foxmail.com
* 张鑫 [zhangxin](https://github.com/ascrutae) &nbsp;&nbsp;


___

<a href="https://github.com/wu-sheng/sky-walking">
<img src="http://wu-sheng.github.io/sky-walking/sample-code/award/oneapm-award.png" alt="OneAPM Open Source Achievement Award" height="110px" align="left" />
</a>

In October 2016, Sky Walking won `OneAPM Open Source Achievement Award`. The award appreciates sky walking for its "*contribution to popularization of APM technology*". <br/>
[OneAPM](http://www.oneapm.com/) will provide financial support for the project in 2016-2017.<br/><br/> 
Thanks all users of sky walking project.
___

# Discussion
<img src="http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/chatapp/toutiao.JPG" alt="Sky Walking TouTiao" height="280px" align="left" />
* Mail to：wu.sheng@foxmail.com
* QQ Group：392443393
* If you are using SkyWalking，[Report to us](https://github.com/wu-sheng/sky-walking/issues/34) please.
* **Developer Org of sky-walking** is https://github.com/skywalking-developer
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# 整体架构图
![2.0 架构图](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/2.0-2016/SkyWalkingArch.jpg)

# 典型页面展现 / Typical UI show
* 支持浏览器：Firefox/Chrome

## 实时调用链路
* 实时链路追踪展现
![追踪连路图1](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/callChain.png)
* 实时链路追踪详细信息查看
![追踪连路图2](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/callChainDetail.png)
* 实时链路追踪日志查看
![追踪连路图3](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/callChainLog.png)
* 实时链路异常告警邮件
![告警邮件](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/alarmMail.png)
* 添加应用
![添加应用](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/addApp.png)
* 应用列表展现
![应用列表展现](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/appList.png)

## 分析汇总
* 分析结果查询，根据viewpoint模糊匹配查询。查询方式为viewpoint: + 关键字
![应用列表展现](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/searchAnalysisResult.png)
* 分析结果展现，通过分析结果查询页面点击进入
![应用列表展现](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/analysisResult.png)
* 分析典型调用链展现
![应用列表展现](http://wu-sheng.github.io/sky-walking/sample-code/screenshoot/1.0b/typicalAnalysisResult.png)

# v2.0-2016 Quick Start

## Required of third party softwares
- JDK 1.8
- zookeeper 3.4.6
- mysql
- redis-3.0.5

## instrument javaagent jdk version
- support 1.6+ , instruments applications can run in jdk6

## 编译与部署 / Build and deploy
- 服务端发布版本[下载](https://github.com/wu-sheng/sky-walking/releases)  (.tar.gz)
- Download Server release version. [Download](https://github.com/wu-sheng/sky-walking/releases)  (.tar.gz)
- [配置应用服务器](CONFIG_DOC.md)
- [config servers](CONFIG_DOC.md)
- 如果您想自己编译最新版本，可参考《[代码编译说明](BUILD_DOC.md)》
- [Code compilation instructions](BUILD_DOC.md)


## Download offical agent
[ ![Download](https://api.bintray.com/packages/wu-sheng/skywalking/com.a.eye.skywalking-agent/images/download.svg) ](https://bintray.com/wu-sheng/skywalking/com.a.eye.skywalking-agent/_latestVersion)

- 通过github-release[下载](https://github.com/wu-sheng/sky-walking/releases)
- 通过[skywalking bintray官网](https://bintray.com/wu-sheng/skywalking/)托管，可使用公网仓库[https://jcenter.bintray.com/](https://jcenter.bintray.com/)下载。
- use public repository  [https://jcenter.bintray.com/](https://jcenter.bintray.com/) to download sdk


## 下载并设置授权文件 / Download auth file
- 注册并登陆过skywalking-webui，创建应用。（一个用户代表一个逻辑集群，一个应用代表一个服务集群。如前后端应用应该设置两个应用，但归属一个用户）
- Sign up and login in skywalking-webui. Create application as needed.
- 下载授权文件，放在在agent jar所在目录中
- download auth file(*.auth), and copy the auth file to directory of the agent jar

## 在运行时环境中设置环境变量 / set environment variables 
```
export SKYWALKING_RUN=true
```
- 设置完成后，SkyWalking将随应用启动运行
- After set env, SkyWalking will be working, when application startup.


## 使用-javaagent 并启动应用程序 / start application with -javaagent
- 为应用程序添加启动参数
```shell
java -jar ...  -javaagent:/..ospath../skywalking-agent-x.x-Final.jar
```
- Tomcat可以使用修改启动文件，配置-javaagent参数

# 在应用程序中显示traceid / How to find tid
- 通过web应用的http调用入口，通过返回的header信息，找到此次调用的traceid。前提：此web应用的url，已经使用skywalking进行监控。

# Development Documents
- [Development Guide of Plugin](https://github.com/wu-sheng/sky-walking/wiki/Development-Guide-of-Plugin)

# QA
- [SkyWalking SDK是否已经工作？ Is SkyWalking SDK Running?](QA/IS_RUNNING.md)
- [tid在web-ui上无法查询. tid can't be search on web-ui](QA/TID_CANNOT_BE_SEARCH.md)
- [SkyWalking Server的运行情况. The status of SkyWalking Server](QA/SERVER_RUNNING_STAUTS.md)
- [SkyWalking Analysis部署运行常见问题. The FAQ of SkyWalking Analysis deployment](QA/deploy-sw_analysis-problem.md)

# 源代码说明
* [网络传输协议、缓存文件协议说明. the protocols of transform between agent and collector, collector buffer file](doc/protocol.md)

# Recent RoadMap
* [In the schedule] v2.1-2017
	* release a version following OpenTracing.io
	* provide bridge mode lib to integrate data of system and tracer
	* provide English doc as default. Also provide Chinese version on Gitbook or Wiki
	* support log framework(log4j, log4j2, logback) to output traceid in system log.
	
* [Dev] v2.0-2016
	* 移除对于Hadoop，HBase的依赖，降低部署和运维难度
	* 使用内嵌式数据库，和分布式集群
	* 移除副本发送机制
	* 支持数据文件的时间分片，支持集群TB级别日志文件存储
	* 支持统计和高效的准实时统计汇总
	* 更多插件的支持
		* motan rpc framework (provided)
	
* [Release] v1.0-Final
	* 客户端与服务端间使用扩展后的网络协议，前置的测试版本无法兼容，以提高服务端的稳定性和健壮性。（在内部使用过程中，发生因为安全扫描，导致服务端宕机）
	* 引入javaagent模式，<b>无需修改任何代码</b>，完成监控。
	* 所有插件将基于字节码技术实现，原有的配置文件模式将被移除。
	
* [Release] v1.0 beta
	* 修复大量前置版本的BUG
	* 提供基于MR的分析能力，能够对调用链进行分析汇总，并形成调用链统计视图

* [Release] v1.0 alpha2
	* 基于v1.0-alpha1的较稳定版本，在内部环境进行数月运行，修复大量影响服务端运行稳定性的问题。
	* v1.0-beta，将提供定时分析任务，部分分析页面展现功能。
	* 预计：后续版本将在插件模式上有较大改变，计划针对java api的拦截和第三方拦截提供更小侵入性的方法。配置和拦截模式会发生相应变化。具体模式，参考v1.0-beta发布时的说明。

 [More...](https://github.com/wu-sheng/sky-walking/releases)