Arthas是一款强大的Java诊断工具，能实时监控线程、内存、GC等信息，支持反编译、代码热更新及调用链路分析等功能，有效提升Java应用的故障排查效率。
- java -jar arthas-boot.jar 启动 选择需要监控的pid编号
- dashboard 可以查看线程，内存，GC，以及Runtime信息
ID NAME GROUP PRIORITY STATE %CPU TIME INTERRUPTED DAEMON 162 Timer-for-arthas-dashboard-50e06196-7685-4d1f-aadd-d93f6c90fb1a system 10 RUNNABLE 35 0:0 false true 54 TaskAcceptor-127.0.0.1 eurekaTaskExecutors 5 TIMED_WAITING 11 0:7 false true 65 SimplePauseDetectorThread_1 main 5 TIMED_WAITING 10 0:6 false true 66 SimplePauseDetectorThread_2 main 5 TIMED_WAITING 10 0:6 false true 64 SimplePauseDetectorThread_0 main 5 TIMED_WAITING 8 0:6 false true 32 TaskAcceptor-target_127.0.0.1 eurekaTaskExecutors 5 TIMED_WAITING 7 0:6 false true 18 SimplePauseDetectorThread_0 system 9 TIMED_WAITING 1 0:0 false true 44 TaskBatchingWorker-target_127.0.0.1-10 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 45 TaskBatchingWorker-target_127.0.0.1-11 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 47 TaskBatchingWorker-target_127.0.0.1-13 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 50 TaskBatchingWorker-target_127.0.0.1-16 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 51 TaskBatchingWorker-target_127.0.0.1-17 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 52 TaskBatchingWorker-target_127.0.0.1-18 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 53 TaskBatchingWorker-target_127.0.0.1-19 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 39 TaskBatchingWorker-target_127.0.0.1-5 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 41 TaskBatchingWorker-target_127.0.0.1-7 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 42 TaskBatchingWorker-target_127.0.0.1-8 eurekaTaskExecutors 5 TIMED_WAITING 1 0:0 false true 19 Abandoned connection cleanup thread main 5 TIMED_WAITING 0 0:0 false true 88 Attach Listener system 9 RUNNABLE 0 0:0 false true 23 ContainerBackgroundProcessor[StandardEngine[Tomcat]] main 5 TIMED_WAITING 0 0:0 false true 87 DestroyJavaVM main 5 RUNNABLE 0 0:8 false false 57 Eureka-CacheFillTimer main 5 TIMED_WAITING 0 0:0 false true 26 Eureka-DeltaRetentionTimer main 5 TIMED_WAITING 0 0:0 false true 27 Eureka-EvictionTimer main 5 TIMED_WAITING 0 0:0 false true 31 Eureka-JerseyClient-Conn-Cleaner2 main 5 TIMED_WAITING 0 0:0 false true 28 Eureka-MeasureRateTimer main 5 TIMED_WAITING 0 0:0 false true 30 Eureka-MeasureRateTimer main 5 TIMED_WAITING 0 0:0 false true 56 Eureka-PeerNodesUpdater main 5 TIMED_WAITING 0 0:0 false true 3 Finalizer system 8 WAITING 0 0:0 false true 99 HikariPool-1 housekeeper main 5 TIMED_WAITING 0 0:0 false true Memory used total max usage GC heap 52M 187M 267M 19.54% gc.ps_scavenge.count 79 ps_eden_space 6M 78M 96M 6.38% gc.ps_scavenge.time(ms) 732 ps_survivor_space 0K 512K 512K 0.00% gc.ps_marksweep.count 40 ps_old_gen 46M 108M 200M 23.03% gc.ps_marksweep.time(ms) 6671 nonheap 103M 115M -1 89.95% code_cache 14M 22M 240M 5.91% metaspace 79M 82M -1 96.25% compressed_class_space 10M 10M 1024M 1.01% direct 80K 80K - 100.00% mapped 0K 0K - NaN% Runtime os.name Linux os.version 2.6.32-431.el6.x86_64 java.version 1.8.0_65 java.home /opt/jdk1.8.0_65/jre systemload.average 0.00 processors 8 uptime 4395s -
jad home.spring.boot.demo.ControllerDemo 反编译工具
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watch home.spring.boot.demo.ControllerDemo print "{params,returnObj,throwExp,target}" > /Data/logs/w.log &
ts=2020-06-05 14:42:40; [cost=5.958944ms] result=@ArrayList[ @Object[][isEmpty=false;size=1], null, @NullPointerException[java.lang.NullPointerException: id is invalid], @ControllerDemo[home.spring.boot.demo.ControllerDemo@20f5281c], ] ts=2020-06-05 14:42:41; [cost=6.750126ms] result=@ArrayList[ @Object[][isEmpty=false;size=1], null, @NullPointerException[java.lang.NullPointerException: id is invalid], @ControllerDemo[home.spring.boot.demo.ControllerDemo@20f5281c], ] ts=2020-06-05 14:42:41; [cost=5.961589ms] result=@ArrayList[ @Object[][isEmpty=false;size=1], null, @NullPointerException[java.lang.NullPointerException: id is invalid], @ControllerDemo[home.spring.boot.demo.ControllerDemo@20f5281c], ] ts=2020-06-05 14:42:44; [cost=9.147448ms] result=@ArrayList[ @Object[][isEmpty=false;size=1], @String[hello SpringBoot!], null, @ControllerDemo[home.spring.boot.demo.ControllerDemo@20f5281c], ] -
tt -t home.spring.boot.demo.ControllerDemo print -n 10 > /Data/logs/test.log &
Affect(class count: 1 , method count: 1) cost in 72 ms, listenerId: 4 INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ 1010 2020-06-05 13:57:29 45.979413 false true 0x20f5281c ControllerDemo print 1011 2020-06-05 13:57:29 16.911348 false true 0x20f5281c ControllerDemo print 1012 2020-06-05 13:57:29 7.881976 false true 0x20f5281c ControllerDemo print 1013 2020-06-05 13:57:29 6.822336 false true 0x20f5281c ControllerDemo print 1014 2020-06-05 13:57:29 7.321216 false true 0x20f5281c ControllerDemo print 1015 2020-06-05 13:57:29 9.011788 false true 0x20f5281c ControllerDemo print 1016 2020-06-05 13:57:30 9.791365 false true 0x20f5281c ControllerDemo print 1017 2020-06-05 13:57:30 7.251141 false true 0x20f5281c ControllerDemo print 1018 2020-06-05 13:57:30 7.149456 false true 0x20f5281c ControllerDemo print 1019 2020-06-05 13:57:30 7.756823 false true 0x20f5281c ControllerDemo print Command execution times exceed limit: 10, so command will exit. You can set it with -n option. -
tt --play -i 1019 回放上面的统计的细节信息
[arthas@19358]$ tt --play -i 1019 RE-INDEX 1019 GMT-REPLAY 2020-06-05 14:46:10 OBJECT 0x20f5281c CLASS home.spring.boot.demo.ControllerDemo METHOD print PARAMETERS[0] @String[8] IS-RETURN false IS-EXCEPTION true THROW-EXCEPTION java.lang.NullPointerException: id is invalid at home.spring.boot.demo.ControllerDemo.print(ControllerDemo.java:87) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at com.taobao.arthas.core.advisor.ArthasMethod.invoke(ArthasMethod.java:156) at com.taobao.arthas.core.command.monitor200.TimeTunnelCommand.processPlay(TimeTunnelCommand.java:481) at com.taobao.arthas.core.command.monitor200.TimeTunnelCommand.process(TimeTunnelCommand.java:280) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.process(AnnotatedCommandImpl.java:82) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl.access$100(AnnotatedCommandImpl.java:18) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:111) at com.taobao.arthas.core.shell.command.impl.AnnotatedCommandImpl$ProcessHandler.handle(AnnotatedCommandImpl.java:108) at com.taobao.arthas.core.shell.system.impl.ProcessImpl$CommandProcessTask.run(ProcessImpl.java:372) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) -
trace工具来统计各步骤调用的耗时
[arthas@19358]$ trace home.spring.boot.demo.ControllerDemo print
trace com.ytao.service.UserServiceImpl getUser '#cost > 1' 过滤总耗时小于1毫秒的记录
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 113 ms, listenerId: 8
`---ts=2020-06-05 14:47:22;thread_name=http-nio-1111-exec-2;id=49;is_daemon=true;priority=5;TCCL=org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader@4c548fbf
`---[-5.869706408793622E9ms] home.spring.boot.demo.ControllerDemo:print()
`---[-5.869706411278678E9ms] home.spring.boot.demo.ControllerDemo$1:<init>() #54
`---[-5.869706411593806E9ms] home.spring.boot.service.mybatis.MybaitisService:findById() #70
`---[-5.86970643135107E9ms] home.spring.boot.redis.RedisService:setKey() #79
`---[2.043958ms] home.spring.boot.event.EventPublishService:eventPublish() #90 -
redefine 实现热部署
[arthas@19358]$ sc -d *ControllerDemo class-info home.spring.boot.demo.ControllerDemo code-source file:/home/dev/boot.test-1.0-SNAPSHOT.jar!/BOOT-INF/classes!/ name home.spring.boot.demo.ControllerDemo isInterface false isAnnotation false isEnum false isAnonymousClass false isArray false isLocalClass false isMemberClass false isPrimitive false isSynthetic false simple-name ControllerDemo modifier public annotation org.springframework.web.bind.annotation.RestController interfaces super-class +-java.lang.Object class-loader +-org.springframework.boot.loader.LaunchedURLClassLoader@37bba400 +-sun.misc.Launcher$AppClassLoader@33909752 +-sun.misc.Launcher$ExtClassLoader@59470966 classLoaderHash 37bba400 上述命令获取 classLoaderHash redefine -c 37bba400 /Data/logs/ControllerDemo.classredefine 会有局限性 增加代码的时候可能会报下面的异常
[arthas@19358]$ redefine -c 37bba400 /Data/logs/Metrics.class
redefine error! java.lang.UnsupportedOperationException: class redefinition failed: attempted to add a method
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