Arthas Ali online troubleshooting tool

table of Contents

What can Arthas do for you?

Arthas a sneak peek

watch print input parameters and return value

The order and execution of the trace printing method

ttStatic method field value call

monitor method execution time

Connect arthas through a browser

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Web address: https://arthas.aliyun.com/doc/index.html 

What can Arthas do for you?

Arthas It is Alibaba's open source Java diagnostic tool, which is deeply loved by developers.

When you encounter the following similar problems and are at a loss, it Arthascan help you solve them:

1. Which jar package is this class loaded from? Why are various types of related Exception reported?

2. Why is the code I changed not executed? Could it be that I didn't commit? Wrong branch?

3. I can’t debug online if I encounter a problem, can I only republish it by adding a log?

4. I encountered a user's data processing problem online, but the online debugging is also impossible, and the offline cannot be reproduced!

5. Is there a global perspective to view the health of the system?

6. Is there any way to monitor the real-time running status of the JVM?

7. How to quickly locate application hot spots and generate flame graphs?

ArthasSupport JDK 6+, support Linux/Mac/Windows, adopt the command line interactive mode, and provide rich  Tab auto-completion functions to further facilitate problem location and diagnosis.

Arthas a sneak peek

The premise is to install Arthas, refer to the domestic gitee address: https://gitee.com/arthas/arthas

watch print input parameters and return value

[arthas@18656]$ watch com.forestar.redis.RedisDistributedLock tryGetDistributedLock "{params,returnObj}" -x 2 -b -s -n 10
Press Q or Ctrl+C to abort.
Affect(class count: 1 , method count: 1) cost in 81 ms, listenerId: 7
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtEnter
ts=2021-03-03 09:15:33; [cost=0.038707ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[71f3965f-9429-4104-a475-03eacfd48dec],
        @Integer[5000],
    ],
    null,
]
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtExit
ts=2021-03-03 09:15:33; [cost=2.3058954671954437E10ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[71f3965f-9429-4104-a475-03eacfd48dec],
        @Integer[5000],
    ],
    @Boolean[true],
]
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtEnter
ts=2021-03-03 09:15:43; [cost=0.016312ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[7471d14f-4a60-4011-9623-d42b11e6d78c],
        @Integer[5000],
    ],
    null,
]
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtExit
ts=2021-03-03 09:15:43; [cost=2.3058964472276306E10ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[7471d14f-4a60-4011-9623-d42b11e6d78c],
        @Integer[5000],
    ],
    @Boolean[true],
]
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtEnter
ts=2021-03-03 09:15:46; [cost=0.016448ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[9132dcb6-b999-4fdc-902e-f834acd6a029],
        @Integer[5000],
    ],
    null,
]
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtExit
ts=2021-03-03 09:15:46; [cost=2.3058967163121655E10ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[9132dcb6-b999-4fdc-902e-f834acd6a029],
        @Integer[5000],
    ],
    @Boolean[false],
]
method=com.forestar.redis.RedisDistributedLock.tryGetDistributedLock location=AtEnter
ts=2021-03-03 09:15:51; [cost=0.011194ms] result=@ArrayList[
    @Object[][
        @String[xht:application:hly-id-lock],
        @String[9132dcb6-b999-4fdc-902e-f834acd6a029],
        @Integer[5],
    ],
    null,
]

The order and execution of the trace printing method

[arthas@18656]$ trace com.forestar.xht.hly.XHRYCtrl hly_add 
Press Q or Ctrl+C to abort.
Affect(class count: 2 , method count: 2) cost in 319 ms, listenerId: 10
`---ts=2021-03-03 09:33:07;thread_name=http-nio-8081-exec-7;id=27;is_daemon=true;priority=5;TCCL=org.apache.catalina.loader.WebappClassLoader@432cd66e
    `---[2.241784ms] com.forestar.xht.hly.XHRYCtrl$$EnhancerByCGLIB$$9eca3052:hly_add()
        `---[2.068124ms] net.sf.cglib.proxy.MethodInterceptor:intercept() #95
            `---[1.930108ms] com.forestar.xht.hly.XHRYCtrl:hly_add()
                +---[0.036573ms] data.common.util.StringUtils:IsNullOrEmpty() #183
                +---[0.01407ms] com.forestar.xht.util.Utils:getWorkSpace() #189
                +---[0.044448ms] com.forestar.xht.util.Utils:getMetadataWorkspace() #192
                +---[0.017292ms] data.metadata.IMetadataWorkspace:OpenTable() #95
                +---[0.00912ms] com.forestar.xht.util.Utils:getBaseDataService() #193
                +---[0.183323ms] com.alibaba.fastjson.JSONObject:parseObject() #196
                +---[0.011264ms] data.general.RowBase:<init>() #198
                +---[0.010371ms] data.general.RowBase:setCurrentObjects() #199
                +---[0.008256ms] com.forestar.core.session.SessionFactory:getSession() #201
                +---[0.010008ms] com.forestar.core.session.ISession:getTableSuffix() #95
                +---[0.037512ms] data.general.RowBase:getCurrentObjects() #202
                +---[0.010109ms] com.forestar.syscore.encrypt.MD5:<init>() #203
                +---[0.006698ms] data.general.RowBase:getCurrentObjects() #204
                +---[0.034949ms] com.forestar.syscore.encrypt.MD5:getMD5() #95
                +---[0.008434ms] data.general.RowBase:getCurrentObjects() #206
                +---[0.007273ms] data.general.QueryFilter:<init>() #207
                +---[0.024029ms] data.general.QueryFilter:setWhereString() #208
                `---[0.77195ms] com.forestar.redis.RedisDistributedLock:tryGetDistributedLockByBlocking() #215
 
`---ts=2021-03-03 09:33:16;thread_name=http-nio-8081-exec-35;id=52;is_daemon=true;priority=5;TCCL=org.apache.catalina.loader.WebappClassLoader@432cd66e
    `---[1.0833ms] com.forestar.xht.hly.XHRYCtrl$$EnhancerByCGLIB$$9eca3052:hly_add()
        `---[1.019633ms] net.sf.cglib.proxy.MethodInterceptor:intercept() #95
            `---[0.954022ms] com.forestar.xht.hly.XHRYCtrl:hly_add()
                +---[0.007426ms] data.common.util.StringUtils:IsNullOrEmpty() #183
                +---[0.038057ms] com.forestar.xht.util.Utils:getWorkSpace() #189
                +---[0.00616ms] com.forestar.xht.util.Utils:getMetadataWorkspace() #192
                +---[0.007478ms] data.metadata.IMetadataWorkspace:OpenTable() #95
                +---[0.007375ms] com.forestar.xht.util.Utils:getBaseDataService() #193
                +---[0.038762ms] com.alibaba.fastjson.JSONObject:parseObject() #196
                +---[0.005113ms] data.general.RowBase:<init>() #198
                +---[0.006275ms] data.general.RowBase:setCurrentObjects() #199
                +---[0.006229ms] com.forestar.core.session.SessionFactory:getSession() #201
                +---[0.006964ms] com.forestar.core.session.ISession:getTableSuffix() #95
                +---[0.004853ms] data.general.RowBase:getCurrentObjects() #202
                +---[0.005499ms] com.forestar.syscore.encrypt.MD5:<init>() #203
                +---[0.004376ms] data.general.RowBase:getCurrentObjects() #204
                +---[0.019182ms] com.forestar.syscore.encrypt.MD5:getMD5() #95
                +---[0.004806ms] data.general.RowBase:getCurrentObjects() #206
                +---[0.005104ms] data.general.QueryFilter:<init>() #207
                +---[0.004758ms] data.general.QueryFilter:setWhereString() #208
                `---[0.511894ms] com.forestar.redis.RedisDistributedLock:tryGetDistributedLockByBlocking() #215
 
`---ts=2021-03-03 09:33:25;thread_name=http-nio-8081-exec-15;id=2f;is_daemon=true;priority=5;TCCL=org.apache.catalina.loader.WebappClassLoader@432cd66e
    `---[0.95822ms] com.forestar.xht.hly.XHRYCtrl$$EnhancerByCGLIB$$9eca3052:hly_add()
        `---[0.920732ms] net.sf.cglib.proxy.MethodInterceptor:intercept() #95
            `---[0.866213ms] com.forestar.xht.hly.XHRYCtrl:hly_add()
                +---[0.007652ms] data.common.util.StringUtils:IsNullOrEmpty() #183
                +---[0.011245ms] com.forestar.xht.util.Utils:getWorkSpace() #189
                +---[0.005283ms] com.forestar.xht.util.Utils:getMetadataWorkspace() #192
                +---[0.007431ms] data.metadata.IMetadataWorkspace:OpenTable() #95
                +---[0.007284ms] com.forestar.xht.util.Utils:getBaseDataService() #193
                +---[0.039893ms] com.alibaba.fastjson.JSONObject:parseObject() #196
                +---[0.005045ms] data.general.RowBase:<init>() #198
                +---[0.004925ms] data.general.RowBase:setCurrentObjects() #199
                +---[0.005901ms] com.forestar.core.session.SessionFactory:getSession() #201
                +---[0.008045ms] com.forestar.core.session.ISession:getTableSuffix() #95
                +---[0.00491ms] data.general.RowBase:getCurrentObjects() #202
                +---[0.005447ms] com.forestar.syscore.encrypt.MD5:<init>() #203
                +---[0.004425ms] data.general.RowBase:getCurrentObjects() #204
                +---[0.017348ms] com.forestar.syscore.encrypt.MD5:getMD5() #95
                +---[0.004585ms] data.general.RowBase:getCurrentObjects() #206
                +---[0.004571ms] data.general.QueryFilter:<init>() #207
                +---[0.004564ms] data.general.QueryFilter:setWhereString() #208
                `---[0.431266ms] com.forestar.redis.RedisDistributedLock:tryGetDistributedLockByBlocking() #215

ttStatic method field value call

Get the static fields of the class and call the static methods of the class: https://arthas.aliyun.com/doc/tt.html

monitor method execution time

Connect arthas through a browser

Arthas currently supports Web Console. After successfully attaching, users can directly visit: http://127.0.0.1:3658/ .

You can fill in the IP to connect to arthas on other machines remotely.

By default, arthas only listens to 127.0.0.1, so if you want to connect remotely, you can use the --target-ipparameter to specify the IP of the listener  , and refer to -hthe help instructions for more. Note that there will be security risks, consider the following tunnel server solution.