目录
网地址：https://arthas.aliyun.com/doc/index.html
Arthas（阿尔萨斯） 能为你做什么？
Arthas 是Alibaba开源的Java诊断工具，深受开发者喜爱。
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？
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我改的代码为什么没有执行到？难道是我没 commit？分支搞错了？
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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！
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是否有一个全局视角来查看系统的运行状况？
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有什么办法可以监控到JVM的实时运行状态？
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怎么快速定位应用的热点，生成火焰图？
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。
Arthas先睹为快
前提是安装好Arthas，参考国内gitee地址：https://gitee.com/arthas/arthas
watch打印入参和返回值
[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,
]trace打印方法执行的顺序和执行情况
[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() #215tt静态方法字段值调用
获取类的静态字段、调用类的静态方法：https://arthas.aliyun.com/doc/tt.html
monitor方法执行时间
通过浏览器连接arthas
Arthas目前支持Web Console，用户在attach成功之后，可以直接访问：http://127.0.0.1:3658/。
可以填入IP，远程连接其它机器上的arthas。
默认情况下，arthas只listen 127.0.0.1，所以如果想从远程连接，则可以使用
--target-ip参数指定listen的IP，更多参考-h的帮助说明。 注意会有安全风险，考虑下面的tunnel server的方案。