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< span id = "tt" > < / span > < h1 > tt< a class = "headerlink" href = "#tt" title = "Permalink to this headline" > ¶< / a > < / h1 >
< p > Check the < code class = "docutils literal notranslate" > < span class = "pre" > parameters< / span > < / code > , < code class = "docutils literal notranslate" > < span class = "pre" > return< / span > < span class = "pre" > values< / span > < / code > and < code class = "docutils literal notranslate" > < span class = "pre" > exceptions< / span > < / code > of the methods at different times.< / p >
< p > < code class = "docutils literal notranslate" > < span class = "pre" > watch< / span > < / code > is a powerful command but due to its feasibility and complexity, it’ < / p >
< p > In such difficulties, < code class = "docutils literal notranslate" > < span class = "pre" > tt< / span > < / code > comes into play.< / p >
< p > With the help of < code class = "docutils literal notranslate" > < span class = "pre" > tt< / span > < / code > (< em > TimeTunnel< / em > ), you can check the contexts of the methods at different times in execution history.< / p >
< div class = "section" id = "usage" >
< span id = "usage" > < / span > < h2 > Usage< a class = "headerlink" href = "#usage" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Let’ < / p >
< div class = "highlight-java notranslate" > < div class = "highlight" > < pre > < span > < / span > < span class = "n" > $< / span > < span class = "n" > tt< / span > < span class = "o" > -< / span > < span class = "n" > t< / span > < span class = "o" > -< / span > < span class = "n" > n< / span > < span class = "mi" > 3< / span > < span class = "o" > *< / span > < span class = "n" > Test< / span > < span class = "n" > print< / span >
< span class = "n" > Press< / span > < span class = "n" > Ctrl< / span > < span class = "o" > +< / span > < span class = "n" > D< / span > < span class = "n" > or< / span > < span class = "n" > Ctrl< / span > < span class = "o" > +< / span > < span class = "n" > X< / span > < span class = "n" > to< / span > < span class = "n" > abort< / span > < span class = "o" > .< / span >
< span class = "nf" > Affect< / span > < span class = "o" > (< / span > < span class = "n" > class< / span > < span class = "o" > -< / span > < span class = "n" > cnt< / span > < span class = "o" > :< / span > < span class = "mi" > 1< / span > < span class = "o" > ,< / span > < span class = "n" > method< / span > < span class = "o" > -< / span > < span class = "n" > cnt< / span > < span class = "o" > :< / span > < span class = "mi" > 1< / span > < span class = "o" > )< / span > < span class = "n" > cost< / span > < span class = "n" > in< / span > < span class = "mi" > 115< / span > < span class = "n" > ms< / span > < span class = "o" > .< / span >
< span class = "o" > +----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+< / span >
< span class = "o" > |< / span > < span class = "n" > INDEX< / span > < span class = "o" > |< / span > < span class = "n" > TIMESTAMP< / span > < span class = "o" > |< / span > < span class = "n" > COST< / span > < span class = "o" > (< / span > < span class = "n" > ms< / span > < span class = "o" > )< / span > < span class = "o" > |< / span > < span class = "n" > IS< / span > < span class = "o" > -< / span > < span class = "n" > RET< / span > < span class = "o" > |< / span > < span class = "n" > IS< / span > < span class = "o" > -< / span > < span class = "n" > EXP< / span > < span class = "o" > |< / span > < span class = "n" > OBJECT< / span > < span class = "o" > |< / span > < span class = "n" > CLASS< / span > < span class = "o" > |< / span > < span class = "n" > METHOD< / span > < span class = "o" > |< / span >
< span class = "o" > +----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+< / span >
< span class = "o" > |< / span > < span class = "mi" > 1007< / span > < span class = "o" > |< / span > < span class = "mi" > 2015< / span > < span class = "o" > -< / span > < span class = "mo" > 07< / span > < span class = "o" > -< / span > < span class = "mi" > 26< / span > < span class = "mi" > 12< / span > < span class = "o" > :< / span > < span class = "mi" > 23< / span > < span class = "o" > :< / span > < span class = "mi" > 21< / span > < span class = "o" > |< / span > < span class = "mi" > 138< / span > < span class = "o" > |< / span > < span class = "kc" > true< / span > < span class = "o" > |< / span > < span class = "kc" > false< / span > < span class = "o" > |< / span > < span class = "mh" > 0x42cc13a0< / span > < span class = "o" > |< / span > < span class = "n" > GaOgnlUtilsTest< / span > < span class = "o" > |< / span > < span class = "n" > print< / span > < span class = "o" > |< / span >
< span class = "o" > +----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+< / span >
< span class = "o" > |< / span > < span class = "mi" > 1008< / span > < span class = "o" > |< / span > < span class = "mi" > 2015< / span > < span class = "o" > -< / span > < span class = "mo" > 07< / span > < span class = "o" > -< / span > < span class = "mi" > 26< / span > < span class = "mi" > 12< / span > < span class = "o" > :< / span > < span class = "mi" > 23< / span > < span class = "o" > :< / span > < span class = "mi" > 22< / span > < span class = "o" > |< / span > < span class = "mi" > 143< / span > < span class = "o" > |< / span > < span class = "kc" > true< / span > < span class = "o" > |< / span > < span class = "kc" > false< / span > < span class = "o" > |< / span > < span class = "mh" > 0x42cc13a0< / span > < span class = "o" > |< / span > < span class = "n" > GaOgnlUtilsTest< / span > < span class = "o" > |< / span > < span class = "n" > print< / span > < span class = "o" > |< / span >
< span class = "o" > +----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+< / span >
< span class = "o" > |< / span > < span class = "mi" > 1009< / span > < span class = "o" > |< / span > < span class = "mi" > 2015< / span > < span class = "o" > -< / span > < span class = "mo" > 07< / span > < span class = "o" > -< / span > < span class = "mi" > 26< / span > < span class = "mi" > 12< / span > < span class = "o" > :< / span > < span class = "mi" > 23< / span > < span class = "o" > :< / span > < span class = "mi" > 23< / span > < span class = "o" > |< / span > < span class = "mi" > 130< / span > < span class = "o" > |< / span > < span class = "kc" > true< / span > < span class = "o" > |< / span > < span class = "kc" > false< / span > < span class = "o" > |< / span > < span class = "mh" > 0x42cc13a0< / span > < span class = "o" > |< / span > < span class = "n" > GaOgnlUtilsTest< / span > < span class = "o" > |< / span > < span class = "n" > print< / span > < span class = "o" > |< / span >
< span class = "o" > +----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+< / span >
< span class = "n" > $< / span >
< / pre > < / div >
< / div >
< div class = "section" id = "f-y-i" >
< span id = "f-y-i" > < / span > < h3 > F.Y.I< a class = "headerlink" href = "#f-y-i" title = "Permalink to this headline" > ¶< / a > < / h3 >
< ul >
< li > < p class = "first" > < code class = "docutils literal notranslate" > < span class = "pre" > -t< / span > < / code > < / p >
< p > record the calling context of the method < code class = "docutils literal notranslate" > < span class = "pre" > *Test.print< / span > < / code > < / p >
< / li >
< li > < p class = "first" > < code class = "docutils literal notranslate" > < span class = "pre" > -n< / span > < span class = "pre" > 3< / span > < / code > < / p >
< p > limit the number of the records (avoid overflow for too many records; with < code class = "docutils literal notranslate" > < span class = "pre" > -n< / span > < / code > option, Arthas can automatically stop recording once the records reach the specified limit)< / p >
< / li >
< / ul >
< / div >
< div class = "section" id = "property" >
< span id = "property" > < / span > < h3 > Property< a class = "headerlink" href = "#property" title = "Permalink to this headline" > ¶< / a > < / h3 >
< table border = "1" class = "docutils" >
< thead >
< tr >
< th > Name< / th >
< th > Specification< / th >
< / tr >
< / thead >
< tbody >
< tr >
< td > INDEX< / td >
< td > the index for each call based on time< / td >
< / tr >
< tr >
< td > TIMESTAMP< / td >
< td > time to invoke the method< / td >
< / tr >
< tr >
< td > COST(ms)< / td >
< td > time cost of the method call< / td >
< / tr >
< tr >
< td > IS-RET< / td >
< td > whether method exits with normal return< / td >
< / tr >
< tr >
< td > IS-EXP< / td >
< td > whether method failed with exceptions< / td >
< / tr >
< tr >
< td > OBJECT< / td >
< td > < code > hashCode()< / code > of the object invoking the method< / td >
< / tr >
< tr >
< td > CLASS< / td >
< td > class name of the object invoking the method< / td >
< / tr >
< tr >
< td > METHOD< / td >
< td > method being invoked< / td >
< / tr >
< / tbody >
< / table > < / div >
< div class = "section" id = "condition-expression" >
< span id = "condition-expression" > < / span > < h3 > Condition expression< a class = "headerlink" href = "#condition-expression" title = "Permalink to this headline" > ¶< / a > < / h3 >
< p > Tips:< / p >
< ol class = "simple" >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > tt< / span > < span class = "pre" > -t< / span > < span class = "pre" > *Test< / span > < span class = "pre" > print< / span > < span class = "pre" > params[0].length==1< / span > < / code > with different amounts of parameters;< / li >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > tt< / span > < span class = "pre" > -t< / span > < span class = "pre" > *Test< / span > < span class = "pre" > print< / span > < span class = "pre" > 'params[1]< / span > < span class = "pre" > instanceof< / span > < span class = "pre" > Integer'< / span > < / code > with different types of parameters;< / li >
< li > < code class = "docutils literal notranslate" > < span class = "pre" > tt< / span > < span class = "pre" > -t< / span > < span class = "pre" > *Test< / span > < span class = "pre" > print< / span > < span class = "pre" > params[0].mobile==" 13989838402" < / span > < / code > with specified parameter.< / li >
< / ol >
< p > Advanced:< / p >
< div class = "toctree-wrapper compound" >
< ul >
< li class = "toctree-l1" > < a class = "reference internal" href = "advice-class.html" > Critical fields in expression< / a > < / li >
< li class = "toctree-l1" > < a class = "reference external" href = "https://github.com/alibaba/arthas/issues/71" > Special usage< / a > < / li >
< li class = "toctree-l1" > < a class = "reference external" href = "https://commons.apache.org/proper/commons-ognl/language-guide.html" > OGNL official guide< / a > < / li >
< / ul >
< / div >
< / div >
< / div >
< div class = "section" id = "searching-for-records" >
< span id = "searching-for-records" > < / span > < h2 > Searching for records< a class = "headerlink" href = "#searching-for-records" title = "Permalink to this headline" > ¶< / a > < / h2 >
< div class = "section" id = "all-the-recorded" >
< span id = "all-the-recorded" > < / span > < h3 > All the recorded< a class = "headerlink" href = "#all-the-recorded" title = "Permalink to this headline" > ¶< / a > < / h3 >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ tt -l
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1000 | 2015-07-26 01:16:27 | 130 | true | false | 0x42cc13a0 | GaOgnlUtilsTest | print |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1001 | 2015-07-26 01:16:27 | 0 | false | true | 0x42cc13a0 | GaOgnlUtilsTest | printAddress |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1002 | 2015-07-26 01:16:28 | 119 | true | false | 0x42cc13a0 | GaOgnlUtilsTest | print |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1003 | 2015-07-26 01:16:28 | 0 | false | true | 0x42cc13a0 | GaOgnlUtilsTest | printAddress |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1004 | 2015-07-26 12:21:56 | 130 | true | false | 0x42cc13a0 | GaOgnlUtilsTest | print |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1005 | 2015-07-26 12:21:57 | 138 | true | false | 0x42cc13a0 | GaOgnlUtilsTest | print |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1006 | 2015-07-26 12:21:58 | 130 | true | false | 0x42cc13a0 | GaOgnlUtilsTest | print |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
Affect(row-cnt:7) cost in 2 ms.
$
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "a-specified-method" >
< span id = "a-specified-method" > < / span > < h3 > A specified method< a class = "headerlink" href = "#a-specified-method" title = "Permalink to this headline" > ¶< / a > < / h3 >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ tt -s method.name==" printAddress"
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| INDEX | TIMESTAMP | COST(ms) | IS-RET | IS-EXP | OBJECT | CLASS | METHOD |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1001 | 2015-07-26 01:16:27 | 0 | false | true | 0x42cc13a0 | GaOgnlUtilsTest | printAddress |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
| 1003 | 2015-07-26 01:16:28 | 0 | false | true | 0x42cc13a0 | GaOgnlUtilsTest | printAddress |
+----------+----------------------+------------+----------+----------+-----------------+--------------------------------+--------------------------------+
Affect(row-cnt:2) cost in 55 ms.
$
< / pre > < / div >
< / div >
< p > Advanced:< / p >
< div class = "toctree-wrapper compound" >
< ul >
< li class = "toctree-l1" > < a class = "reference internal" href = "advice-class.html" > Critical fields in expression< / a > < / li >
< / ul >
< / div >
< / div >
< / div >
< div class = "section" id = "check-context-of-the-call" >
< span id = "check-context-of-the-call" > < / span > < h2 > Check context of the call< a class = "headerlink" href = "#check-context-of-the-call" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Using < code class = "docutils literal notranslate" > < span class = "pre" > tt< / span > < span class = "pre" > -i< / span > < span class = "pre" > < index> < / span > < / code > to check a specific record.< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $
$ tt -i 1003
+-----------------+------------------------------------------------------------------------------------------------------+
| INDEX | 1003 |
+-----------------+------------------------------------------------------------------------------------------------------+
| GMT-CREATE | 2015-07-26 01:16:28 |
+-----------------+------------------------------------------------------------------------------------------------------+
| COST(ms) | 0 |
+-----------------+------------------------------------------------------------------------------------------------------+
| OBJECT | 0x42cc13a0 |
+-----------------+------------------------------------------------------------------------------------------------------+
| CLASS | GaOgnlUtilsTest |
+-----------------+------------------------------------------------------------------------------------------------------+
| METHOD | printAddress |
+-----------------+------------------------------------------------------------------------------------------------------+
| IS-RETURN | false |
+-----------------+------------------------------------------------------------------------------------------------------+
| IS-EXCEPTION | true |
+-----------------+------------------------------------------------------------------------------------------------------+
| PARAMETERS[0] | Address@53448f87 |
+-----------------+------------------------------------------------------------------------------------------------------+
| THROW-EXCEPTION | java.lang.RuntimeException: test |
| | at GaOgnlUtilsTest.printAddress(Unknown Source) |
| | at GaOgnlUtilsTest.< init> (Unknown Source) |
| | at GaOgnlUtilsTest.main(Unknown Source) |
+-----------------+------------------------------------------------------------------------------------------------------+
Affect(row-cnt:1) cost in 1 ms.
$
< / pre > < / div >
< / div >
< / div >
< div class = "section" id = "re-produce" >
< span id = "re-produce" > < / span > < h2 > Re-produce< a class = "headerlink" href = "#re-produce" title = "Permalink to this headline" > ¶< / a > < / h2 >
< p > Since Arthas stores the context of the call, you can even < em > replay< / em > the method calling afterwards with extra option < code class = "docutils literal notranslate" > < span class = "pre" > -p< / span > < / code > to re-produce the issue for advanced troubleshooting.< / p >
< div class = "highlight-default notranslate" > < div class = "highlight" > < pre > < span > < / span > $ tt -i 1003 -p
+-----------------+---------------------------------------------------------------------------------------------------------+
| RE-INDEX | 1003 |
+-----------------+---------------------------------------------------------------------------------------------------------+
| GMT-REPLAY | 2015-07-26 17:29:51 |
+-----------------+---------------------------------------------------------------------------------------------------------+
| OBJECT | 0x42cc13a0 |
+-----------------+---------------------------------------------------------------------------------------------------------+
| CLASS | GaOgnlUtilsTest |
+-----------------+---------------------------------------------------------------------------------------------------------+
| METHOD | printAddress |
+-----------------+---------------------------------------------------------------------------------------------------------+
| PARAMETERS[0] | Address@53448f87 |
+-----------------+---------------------------------------------------------------------------------------------------------+
| IS-RETURN | false |
+-----------------+---------------------------------------------------------------------------------------------------------+
| IS-EXCEPTION | true |
+-----------------+---------------------------------------------------------------------------------------------------------+
| THROW-EXCEPTION | java.lang.RuntimeException: test |
| | at GaOgnlUtilsTest.printAddress(GaOgnlUtilsTest.java:78) |
| | 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:483) |
| | at com.github.ompc.Arthas.util.GaMethod.invoke(GaMethod.java:81) |
| | at com.github.ompc.Arthas.command.TimeTunnelCommand$6.action(TimeTunnelCommand.java:592) |
| | at com.github.ompc.Arthas.server.DefaultCommandHandler.execute(DefaultCommandHandler.java:175) |
| | at com.github.ompc.Arthas.server.DefaultCommandHandler.executeCommand(DefaultCommandHandler.java:83) |
| | at com.github.ompc.Arthas.server.GaServer$4.run(GaServer.java:329) |
| | at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) |
| | at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) |
| | at java.lang.Thread.run(Thread.java:745) |
+-----------------+---------------------------------------------------------------------------------------------------------+
replay time fragment[1003] success.
Affect(row-cnt:1) cost in 3 ms.
$
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< p > F.Y.I< / p >
< ol class = "simple" >
< li > the calling stack is little different using Arthas now unlike the original;< / li >
< li > < strong > Loss< / strong > of the thread local variables will be a undeniable fact since there is no way for Arthas to record the thread local info (< em > If you find one, please share with us in < a class = "reference external" href = "https://github.com/alibaba/arthas/issues" > issues tracker< / a > < / em > ).< / li >
< li > < strong > Potential< / strong > modifications of objects can happen since only a reference will be recorded while later operations might modify objects without Arthas’ < / li >
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