Arthas open the first anniversary, Star 16K, we have been adhere to what?

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Recently I saw a very popular title, "open source XX years, star XXX, how I insist."

See this title, suddenly found Arthas since open source in September 2018, just a year, just in the autumn season do the next summary and review.

ArthasAlibaba is open-source Java diagnostic tools by developers alike.

• Github： github.com/alibaba/art…
• Documentation: alibaba.github.io/arthas

Recalling Arthas number Star history, it has maintained rapid growth, has been a breakthrough 16K.

Thanks to the support of users, not only pressure but also motivation. In the past year, open source, Arthas released a version of Release 7, we have been insisting three points?:

• Continually improve usability
• Easy to use command continues to increase
• Gain strength from the open source community, back to the community

Continually improve usability

Arthas has been the ease of use in the first place, after open source, we made the following improvements:

• Development arthas boot, support for Windows / Linux / Mac unified experience
• Silky completion, reference jshell experience
• Efficient history matching command, Up/Downdirect
• Improved category search matching functionality, better support for lambda and inner classes
• Perfect redirect mechanism
• Support JDK 9/10/11
• Support Docker
• Support rpm / deb packages installed

Although we ease under a lot of effort, but found that many times the user entry more difficult, therefore, we refer to k8s of Interactive Tutorial, launched an online tutorial of Arthas:

• Arthas based tutorial
• Arthas advanced course

By basic tutorial, you can step entry in the interactive terminal where you can deep understanding of the case Arthas troubleshooting through advanced course.

In addition, for the convenience of users large-scale deployment, we realized the tunnel server and user data Reporting:

• Increase tunnel server, unified management Agent Connectivity
• Increase user data return function, easy to do security management and control

Easy to use command continues to increase

Arthas known diagnostic tool is a Java application, so we have to be worthy of the slogan. After the open-source, Arthas continued to increase more than 10 commands.

• ognl command arbitrary code execution
• mc line memory compilers
• redefine the command line heat update code
• a key logger command to view the application in all logger configuration
• sysprop View Update System Properties
• sysenv viewing environment variable
• vmoption view the updated VM option
• View logger logger configuration, update level
• JMX information mbean View
• heapdump heap memory snapshots

The following highlights the two functions.

jad / mc / redefine the code train hot update line

To Arthas online tutorials in the UserControllerexample:

1. Use jad to decompile the code

   jad --source-only com.example.demo.arthas.user.UserController > /tmp/UserController.java
   复制代码

2. Use vim compiled code

   When the user id is less than 1, it returns to normal, nothrow:

       @GetMapping("/user/{id}")
       public User findUserById(@PathVariable Integer id) {
           logger.info("id: {}" , id);
   
           if (id != null && id < 1) {
               return new User(id, "name" + id);
               // throw new IllegalArgumentException("id < 1");
           } else {
               return new User(id, "name" + id);
           }
       }
   复制代码

3. Use mccommand to compile the modifiedUserController.java

   $ mc /tmp/UserController.java -d /tmp
   Memory compiler output:
   /tmp/com/example/demo/arthas/user/UserController.class
   Affect(row-cnt:1) cost in 346 ms
   复制代码

4. Use redefinethe command, because the heat can update code

   $ redefine /tmp/com/example/demo/arthas/user/UserController.class
   redefine success, size: 1
   复制代码

By the logger command to view the configuration, modify level

Website stressful times (such as double 11), there is a mitigation measure is to modify the application log level ERROR. So there are two problems:

• Logging system may have multiple complex applications, which then logs the system configuration takes effect?
• How online level dynamically modify the logger?

By loggercommand, you can view detailed configuration information in the logger applications, such as FileAppenderfile output, AsyncAppenderwhether blocking.

[arthas@2062]$ logger
 name                                   ROOT
 class                                  ch.qos.logback.classic.Logger
 classLoader                            sun.misc.Launcher$AppClassLoader@2a139a55
 classLoaderHash                        2a139a55
 level                                  INFO
 effectiveLevel                         INFO
 additivity                             true
 codeSource                             file:/Users/hengyunabc/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar
 appenders                              name            CONSOLE
                                        class           ch.qos.logback.core.ConsoleAppender
                                        classLoader     sun.misc.Launcher$AppClassLoader@2a139a55
                                        classLoaderHash 2a139a55
                                        target          System.out
                                        name            APPLICATION
                                        class           ch.qos.logback.core.rolling.RollingFileAppender
                                        classLoader     sun.misc.Launcher$AppClassLoader@2a139a55
                                        classLoaderHash 2a139a55
                                        file            app.log
                                        name            ASYNC
                                        class           ch.qos.logback.classic.AsyncAppender
                                        classLoader     sun.misc.Launcher$AppClassLoader@2a139a55
                                        classLoaderHash 2a139a55
                                        blocking        false
                                        appenderRef     [APPLICATION]
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You can also modify the line level logger:

[arthas@2062]$ logger --name ROOT --level debug
update logger level success.
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Gain strength from the open source community, back to the community

Thanks to 67 Contributors

Since Arthas open source, a total of 67 Contributors, thanks improve their contributions:

Community submitted a series of improvements, some of the points listed below (not complete):

• Most of the English translation of the document
• trace command supports line numbers
• Packaging format support rpm / deb
• Improved command-line prompt is arthas@pid
• Improved support for the windows
• Increase mbeancommand
• Improved webconsole experience

In addition, there are 83 companies / organizations to register their use of information, more users are welcome to register:

洐 Health Project

Based on Arthas, also produced a number of Xing student program, here are two of them:

• Bistoury: Where CAPE source projects integrated Arthas
• arthas-mvel: Use a fork MVEL script

User Case Studies

The majority of users in the use of Arthas troubleshooting process, share a lot of the investigation process and experience are welcome to share.

Open source feedback

Arthas itself uses a lot of code open source projects, open source process, we give netty, ognl, cfr and so contributed to improve the code back upstream.

postscript

In doing Arthas brochures, Arthas slogan is:

"Roses hand, durable fragrance even worse."

Arthas future hope to be able to help more users to solve problems, but also hope that the majority of the developers made more improvements and suggestions on Arthas.

Finally, lucky draw, you can forward posts, comments, stories and Arthas's own background in public numbers, or make a suggestion to Arthas, Arthas prize is a sweater?:

No public

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