当你遇到以下类似问题而束手无策时 Arthas可以帮助你解决
这个类从哪个 jar 包加载的 为什么会报各种类相关的 Exception 我改的代码为什么没有执行到 难道是我没 commit 分支搞错了 遇到问题无法在线上 debug 难道只能通过加日志再重新发布吗 线上遇到某个用户的数据处理有问题 但线上同样无法 debug 线下无法重现 是否有一个全局视角来查看系统的运行状况 有什么办法可以监控到JVM的实时运行状态 怎么快速定位应用的热点 生成火焰图 怎样直接从JVM内查找某个类的实例Arthas支持JDK 6 支持Linux/Mac/Windows 采用命令行交互模式 同时提供丰富的 Tab 自动补全功能 进一步方便进行问题的定位和诊断。
在线教程(推荐)使用方法快速开始使用arthas-boot(推荐)下载arthas-boot.jar 然后用java -jar的方式启动
curl -O https://arthas.aliyun.com/arthas-boot.jar java -jar arthas-boot.jar
打印帮助信息
java -jar arthas-boot.jar -h如果下载速度比较慢 可以使用aliyun的镜像 java -jar arthas-boot.jar --repo-mirror aliyun --use-http使用as.sh
Arthas 支持在 Linux/Unix/Mac 等平台上一键安装 请复制以下内容 并粘贴到命令行中 敲 回车 执行即可
curl -L https://arthas.aliyun.com/install.sh | sh
上述命令会下载启动脚本文件 as.sh 到当前目录 你可以放在任何地方或将其加入到 $PATH 中。
直接在shell下面执行./as.sh 就会进入交互界面。
也可以执行./as.sh -h来获取更多参数信息。
文档在线教程(推荐)用户文档安装下载快速入门进阶使用命令列表WebConsoleDockerArthas Spring Boot Starter用户案例FAQ/常见问题编译调试/参与贡献Release NotesQQ群/钉钉群案例展示Dashboardhttps://arthas.aliyun.com/doc/dashboardThreadhttps://arthas.aliyun.com/doc/thread一目了然的了解系统的状态 哪些线程比较占cpu 他们到底在做什么
$ thread -n 3 as-command-execute-daemon Id 29 cpuUsage 75% RUNNABLE at sun.management.ThreadImpl.dumpThreads0(Native Method) at sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:440) at com.taobao.arthas.core.command.monitor200.ThreadCommand$1.action(ThreadCommand.java:58) at com.taobao.arthas.core.command.handler.AbstractCommandHandler.execute(AbstractCommandHandler.java:238) at com.taobao.arthas.core.command.handler.DefaultCommandHandler.handleCommand(DefaultCommandHandler.java:67) at com.taobao.arthas.core.server.ArthasServer$4.run(ArthasServer.java:276) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Number of locked synchronizers 1 - java.util.concurrent.ThreadPoolExecutor$Worker 6cd0b6f8 as-session-expire-daemon Id 25 cpuUsage 24% TIMED_WAITING at java.lang.Thread.sleep(Native Method) at com.taobao.arthas.core.server.DefaultSessionManager$2.run(DefaultSessionManager.java:85) Reference Handler Id 2 cpuUsage 0% WAITING on java.lang.ref.Reference$Lock 69ba0f27 at java.lang.Object.wait(Native Method) - waiting on java.lang.ref.Reference$Lock 69ba0f27 at java.lang.Object.wait(Object.java:503) at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:133)jadhttps://arthas.aliyun.com/doc/jad
对类进行反编译:
$ jad javax.servlet.Servlet
ClassLoader:
-java.net.URLClassLoader 6108b2d7
-sun.misc.Launcher$AppClassLoader 18b4aac2
-sun.misc.Launcher$ExtClassLoader 1ddf84b8
Location:
/Users/xxx/work/test/lib/servlet-api.jar
* Decompiled with CFR 0_122.
package javax.servlet;
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public interface Servlet {
public void init(ServletConfig var1) throws ServletException;
public ServletConfig getServletConfig();
public void service(ServletRequest var1, ServletResponse var2) throws ServletException, IOException;
public String getServletInfo();
public void destroy();
}mchttps://arthas.aliyun.com/doc/mcMemory Compiler/内存编译器 编译.java文件生成.class。
mc /tmp/Test.javaretransformhttps://arthas.aliyun.com/doc/retransform
加载外部的.class文件 retransform 热更新jvm已加载的类。
retransform /tmp/Test.class retransform -c 327a647b /tmp/Test.class /tmp/Test\$Inner.classschttps://arthas.aliyun.com/doc/sc
查找JVM中已经加载的类
$ sc -d org.springframework.web.context.support.XmlWebApplicationContext class-info org.springframework.web.context.support.XmlWebApplicationContext code-source /Users/xxx/work/test/WEB-INF/lib/spring-web-3.2.11.RELEASE.jar name org.springframework.web.context.support.XmlWebApplicationContext isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name XmlWebApplicationContext modifier public annotation interfaces super-class -org.springframework.web.context.support.AbstractRefreshableWebApplicationContext -org.springframework.context.support.AbstractRefreshableConfigApplicationContext -org.springframework.context.support.AbstractRefreshableApplicationContext -org.springframework.context.support.AbstractApplicationContext -org.springframework.core.io.DefaultResourceLoader -java.lang.Object class-loader -org.apache.catalina.loader.ParallelWebappClassLoader -java.net.URLClassLoader 6108b2d7 -sun.misc.Launcher$AppClassLoader 18b4aac2 -sun.misc.Launcher$ExtClassLoader 1ddf84b8 classLoaderHash 25131501vmtoolhttps://arthas.aliyun.com/doc/vmtool
从JVM heap中获取指定类的实例。
$ vmtool --action getInstances --className java.lang.String --limit 10 String[][ String[com/taobao/arthas/core/shell/session/Session], String[com.taobao.arthas.core.shell.session.Session], String[com/taobao/arthas/core/shell/session/Session], String[com/taobao/arthas/core/shell/session/Session], String[com/taobao/arthas/core/shell/session/Session.class], String[com/taobao/arthas/core/shell/session/Session.class], String[com/taobao/arthas/core/shell/session/Session.class], String[com/], String[java/util/concurrent/ConcurrentHashMap$ValueIterator], String[java/util/concurrent/locks/LockSupport], ]stackhttps://arthas.aliyun.com/doc/stack
查看方法 test.arthas.TestStack#doGet 的调用堆栈
$ stack test.arthas.TestStack doGet Press Ctrl C to abort. Affect(class-cnt:1 , method-cnt:1) cost in 286 ms. ts 2018-09-18 10:11:45;thread_name http-bio-8080-exec-10;id is_daemon true;priority TCCL org.apache.catalina.loader.ParallelWebappClassLoader 25131501 test.arthas.TestStack.doGet() at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:451) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1121) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)Tracehttps://arthas.aliyun.com/doc/trace
观察方法执行的时候哪个子调用比较慢:
观察方法 test.arthas.TestWatch#doGet 执行的入参 仅当方法抛出异常时才输出。
$ watch test.arthas.TestWatch doGet {params[0], throwExp} -e
Press Ctrl C to abort.
Affect(class-cnt:1 , method-cnt:1) cost in 65 ms.
ts 2018-09-18 10:26:28;result ArrayList[
RequestFacade[org.apache.catalina.connector.RequestFacade 79f922b2],
NullPointerException[java.lang.NullPointerException],
]Monitorhttps://arthas.aliyun.com/doc/monitor监控某个特殊方法的调用统计数据 包括总调用次数 平均rt 成功率等信息 每隔5秒输出一次。
$ monitor -c 5 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello Press Ctrl C to abort. Affect(class-cnt:1 , method-cnt:1) cost in 109 ms. timestamp class method total success fail avg-rt(ms) fail-rate ---------------------------------------------------------------------------------------------------------------------------- 2018-09-20 09:45:32 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.67 0.00% timestamp class method total success fail avg-rt(ms) fail-rate ---------------------------------------------------------------------------------------------------------------------------- 2018-09-20 09:45:37 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 1.00 0.00% timestamp class method total success fail avg-rt(ms) fail-rate ---------------------------------------------------------------------------------------------------------------------------- 2018-09-20 09:45:42 org.apache.dubbo.demo.provider.DemoServiceImpl sayHello 5 5 0 0.43 0.00%Time Tunnel(tt)https://arthas.aliyun.com/doc/tt
记录方法调用信息 支持事后查看方法调用的参数 返回值 抛出的异常等信息 仿佛穿越时空隧道回到调用现场一般。
$ tt -t org.apache.dubbo.demo.provider.DemoServiceImpl sayHello Press Ctrl C to abort. Affect(class-cnt:1 , method-cnt:1) cost in 75 ms. INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD ------------------------------------------------------------------------------------------------------------------------------------- 1000 2018-09-20 09:54:10 1.971195 true false 0x55965cca DemoServiceImpl sayHello 1001 2018-09-20 09:54:11 0.215685 true false 0x55965cca DemoServiceImpl sayHello 1002 2018-09-20 09:54:12 0.236303 true false 0x55965cca DemoServiceImpl sayHello 1003 2018-09-20 09:54:13 0.159598 true false 0x55965cca DemoServiceImpl sayHello 1004 2018-09-20 09:54:14 0.201982 true false 0x55965cca DemoServiceImpl sayHello 1005 2018-09-20 09:54:15 0.214205 true false 0x55965cca DemoServiceImpl sayHello 1006 2018-09-20 09:54:16 0.241863 true false 0x55965cca DemoServiceImpl sayHello 1007 2018-09-20 09:54:17 0.305747 true false 0x55965cca DemoServiceImpl sayHello 1008 2018-09-20 09:54:18 0.18468 true false 0x55965cca DemoServiceImpl sayHelloClassloaderhttps://arthas.aliyun.com/doc/classloader
了解当前系统中有多少类加载器 以及每个加载器加载的类数量 帮助您判断是否有类加载器泄露。
$ classloader name numberOfInstances loadedCountTotal BootstrapClassLoader 1 3346 com.taobao.arthas.agent.ArthasClassloader 1 1262 java.net.URLClassLoader 2 1033 org.apache.catalina.loader.ParallelWebappClassLoader 1 628 sun.reflect.DelegatingClassLoader 166 166 sun.misc.Launcher$AppClassLoader 1 31 com.alibaba.fastjson.util.ASMClassLoader 6 15 sun.misc.Launcher$ExtClassLoader 1 7 org.jvnet.hk2.internal.DelegatingClassLoader 2 2 sun.reflect.misc.MethodUtil 1 1Web Consolehttps://arthas.aliyun.com/doc/web-console
$ profiler start Started [cpu] profiling
$ profiler stop profiler output file: /tmp/demo/arthas-output/20191125-135546.svg
通过浏览器查看profiler结果
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本文转自网络，原文链接：https://developer.aliyun.com/article/787223
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