Arthas线上诊断
简介
Arthas（阿尔萨斯） 是一款线上监控诊断产品，通过全局视角实时查看应用 load、内存、gc、线程的状态信息，并能在不修改应用代码的情况下，对业务问题进行诊断，包括查看方法调用的出入参、异常，监测方法执行耗时，类加载信息等，大大提升线上问题排查效率。
官方文档 https://arthas.aliyun.com/
安装
bash
curl -L https://arthas.aliyun.com/install.sh | sh
./as.shbash
curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar提示
如果提示telnet is not installed.没有安装，请使用java -jar arthas-boot.jar这种方式
使用
选择JVM进程
bash
root@abb1a712c8cd:/app# java -jar arthas-boot.jar
[INFO] JAVA_HOME: /usr/lib/jvm/java-8-openjdk-amd64/jre
[INFO] arthas-boot version: 3.6.7
[INFO] Found existing java process, please choose one and input the serial number of the process, eg : 1. Then hit ENTER.
* [1]: 7 gponline-web.jar
1
[INFO] Start download arthas from remote server: https://arthas.aliyun.com/download/3.6.7?mirror=aliyun
[INFO] Download arthas success.
[INFO] arthas home: /root/.arthas/lib/3.6.7/arthas
[INFO] Try to attach process 7
Picked up JAVA_TOOL_OPTIONS:
[INFO] Attach process 7 success.
[INFO] arthas-client connect 127.0.0.1 3658
,---. ,------. ,--------.,--. ,--. ,---. ,---.
/ O \ | .--. ''--. .--'| '--' | / O \ ' .-'
| .-. || '--'.' | | | .--. || .-. |`. `-.
| | | || |\ \ | | | | | || | | |.-' |
`--' `--'`--' '--' `--' `--' `--'`--' `--'`-----'
wiki https://arthas.aliyun.com/doc
tutorials https://arthas.aliyun.com/doc/arthas-tutorials.html
version 3.6.7
main_class
pid 7
time 2023-04-07 20:32:49
[arthas@7]$查看帮助
bash
[arthas@7]$ help
NAME DESCRIPTION
help Display Arthas Help
auth Authenticates the current session
keymap Display all the available keymap for the specified connection.
sc Search all the classes loaded by JVM
sm Search the method of classes loaded by JVM
classloader Show classloader info
jad Decompile class
getstatic Show the static field of a class
monitor Monitor method execution statistics, e.g. total/success/failure count, average rt, fail rate, etc.
stack Display the stack trace for the specified class and method
thread Display thread info, thread stack
trace Trace the execution time of specified method invocation.
watch Display the input/output parameter, return object, and thrown exception of specified method invocation
tt Time Tunnel
jvm Display the target JVM information
memory Display jvm memory info.
perfcounter Display the perf counter information.
ognl Execute ognl expression.
mc Memory compiler, compiles java files into bytecode and class files in memory.
redefine Redefine classes. @see Instrumentation#redefineClasses(ClassDefinition...)
retransform Retransform classes. @see Instrumentation#retransformClasses(Class...)
dashboard Overview of target jvm's thread, memory, gc, vm, tomcat info.
dump Dump class byte array from JVM
heapdump Heap dump
options View and change various Arthas options
cls Clear the screen
reset Reset all the enhanced classes
version Display Arthas version
session Display current session information
sysprop Display and change the system properties.
sysenv Display the system env.
vmoption Display, and update the vm diagnostic options.
logger Print logger info, and update the logger level
history Display command history
cat Concatenate and print files
base64 Encode and decode using Base64 representation
echo write arguments to the standard output
pwd Return working directory name
mbean Display the mbean information
grep grep command for pipes.
tee tee command for pipes.
profiler Async Profiler. https://github.com/jvm-profiling-tools/async-profiler
vmtool jvm tool
stop Stop/Shutdown Arthas server and exit the console.
[arthas@7]$sm 查找类中的方法
bash
sm *UserController infobash
[arthas@7]$ sm *UserController info
com.gponline.controller.auth.UserController info(Ljavax/servlet/http/HttpServletRequest;)Lcom/gponline/common/response/Response;
Affect(row-cnt:1) cost in 73 ms.trace 追踪方法执行
bash
trace com.gponline.controller.auth.UserController infobash
[arthas@7]$ trace com.gponline.controller.auth.UserController info
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 332 ms, listenerId: 1
`---ts=2023-04-07 20:37:15;thread_name=http-nio-8080-exec-11;id=16e;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@23b087c3
`---[5.826707ms] com.gponline.controller.auth.UserController:info()
+---[0.64% 0.037154ms ] javax.servlet.http.HttpServletRequest:getParameter() #240
+---[63.54% 3.702035ms ] com.gponline.service.user.interfaces.feign.api.user.UserInfoFeignApi:getActiveUser() #241
+---[0.49% 0.028364ms ] com.gponline.common.model.DTO.GpUserInfoDTO:getUserUniqueCode() #245
+---[11.57% 0.674174ms ] org.slf4j.Logger:info() #246
+---[0.24% 0.013797ms ] org.springframework.data.redis.core.StringRedisTemplate:opsForValue() #247
+---[6.95% 0.404684ms ] org.springframework.data.redis.core.ValueOperations:get() #247
+---[0.18% 0.01042ms ] com.gponline.common.utils.StringUtils:isNotEmpty() #250
+---[6.37% 0.371343ms ] com.alibaba.fastjson.JSONObject:parseObject() #251
`---[0.23% 0.013392ms ] com.gponline.common.response.Response:buildOkRes() #257watch 观察参数返回
bash
watch com.gponline.controller.auth.UserController infobash
[arthas@7]$ watch com.gponline.controller.auth.UserController info
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 161 ms, listenerId: 2
method=com.gponline.controller.auth.UserController.info location=AtExit
ts=2023-04-07 20:40:30; [cost=5.162129ms] result=@ArrayList[
@Object[][isEmpty=false;size=1],
@UserController[com.gponline.controller.auth.UserController@40344a4b],
@Response[Response{code=0, msg='ok', data=UserOutDTO(uniqueId=d7cfa8839d1b4c4b9e9b6fdce1567389, gpId=null, name=, nickName=null, headImg=, phone=null, bindWechat=false, bindQQ=true, hasPwd=false, email=, bindEmail=false, accountDto=UserAccountOutDTO(id=null, userUniqueCode=null, amount=null, totalIncome=null, totalOutcome=null), couponNumber=null, inviteAuth=0, weChatInfo=null, isVip=0)', currentTime=Fri Apr 07 20:40:30 CST 2023}],
]monitor 观察统计
bash
monitor com.gponline.controller.auth.UserController infobash
[arthas@7]$ monitor com.gponline.controller.auth.UserController info
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 146 ms, listenerId: 3
timestamp class method total success fail avg-rt(ms) fail-rate
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2023-04-07 20:53:22 com.gponline.controller.auth.UserController info 23 23 0 3.95 0.00%示例
