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6 years ago
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monitor
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=======
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Monitor the `class-pattern` & `method-pattern` matched methods invoking traces.
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F.Y.I
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1. `monitor` is a persistent command, it never returns until `Ctrl+C` to manually stop it.
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2. the server runs the tasks in the background;
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3. injected code will become invalid automatically once the tasks being terminated;
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4. in theory, Arthas commands will not change any original behaviors.
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### Properties monitored
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|Property|Specification|
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|---:|:---|
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|timestamp|timestamp|
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|class|Java class|
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|method|constructor and regular methods|
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|total|calling times|
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|success|success count|
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|fail|failure count|
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|rt|average RT|
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|fail-rate|failure ratio|
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### Parameters
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|Name|Specification|
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|---:|:---|
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|*class-pattern*|pattern for the class name|
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|*method-pattern*|pattern for the method name|
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|[E]|turn on regx matching while the default is wildcards matching|
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|`[c:]`|cycle of output with default value: `120 s`|
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### Usage
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```shell
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$ monitor -c 5 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 36 ms.
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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2015-12-17 10:56:40 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute 10 10 0 2.00 0.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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2015-12-17 10:56:45 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute 11 11 0 2.18 0.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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2015-12-17 10:56:50 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute 0 0 0 0.00 0.00%
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```
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redefine
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========
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Load the external `*.class` files and *re-define* the JVM-loaded classes.
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Reference: [Instrumentation#redefineClasses](https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#redefineClasses-java.lang.instrument.ClassDefinition...-)
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F.Y.I
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1. Re-defined classes cannot be restores any more;
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2. Re-definition can fail (like adding a new field); for more information, please refer to JDK documentation
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### Options
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|Name|Specification|
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|---:|:---|
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|[c:]|hashcode of the class loader|
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|[p:]|absolute path of the external `*.class` (multiple paths supported)|
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### Usage
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```
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redefine -p /tmp/Test.class
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redefine -c 327a647b -p /tmp/Test.class /tmp/Test\$Inner.class
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```
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@ -0,0 +1,382 @@
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<!DOCTYPE html>
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<title>monitor — Arthas 3.0.5-SNAPSHOT documentation</title>
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<a href="index.html" class="icon icon-home"> Arthas
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<div class="version">
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3.0.5-SNAPSHOT
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<li class="toctree-l1"><a class="reference internal" href="install-detail.html">Installation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="dump.html">dump</a></li>
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<li class="toctree-l2"><a class="reference internal" href="redefine.html">redefine</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">monitor</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#properties-monitored">Properties monitored</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#parameters">Parameters</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#usage">Usage</a></li>
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</ul>
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<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/watch.md">watch</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/trace.md">trace</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/stack.md">stack</a></li>
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<li class="toctree-l2"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/tt.md">tt</a></li>
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<li class="toctree-l2"><a class="reference internal" href="options.html">options</a></li>
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<li class="toctree-l2"><a class="reference internal" href="commands.html#arthas-basic-commands">Arthas Basic Commands</a></li>
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</ul>
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</li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Auser-case">User cases</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/release-notes.md">Release Notes</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues?q=label%3Aquestion-answered">Questions and answers</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas">Fork me at GitHub</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/blob/master/CONTRIBUTING.md">CONTRIBUTING</a></li>
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<hr/>
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</div>
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<div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article">
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<div itemprop="articleBody">
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<div class="section" id="monitor">
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<span id="monitor"></span><h1>monitor<a class="headerlink" href="#monitor" title="Permalink to this headline">¶</a></h1>
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<p>Monitor the <code class="docutils literal notranslate"><span class="pre">class-pattern</span></code> & <code class="docutils literal notranslate"><span class="pre">method-pattern</span></code> matched methods invoking traces.</p>
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<p>F.Y.I</p>
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<ol class="simple">
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<li><code class="docutils literal notranslate"><span class="pre">monitor</span></code> is a persistent command, it never returns until <code class="docutils literal notranslate"><span class="pre">Ctrl+C</span></code> to manually stop it.</li>
|
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<li>the server runs the tasks in the background;</li>
|
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<li>injected code will become invalid automatically once the tasks being terminated;</li>
|
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<li>in theory, Arthas commands will not change any original behaviors.</li>
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</ol>
|
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<div class="section" id="properties-monitored">
|
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<span id="properties-monitored"></span><h2>Properties monitored<a class="headerlink" href="#properties-monitored" title="Permalink to this headline">¶</a></h2>
|
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<table border="1" class="docutils">
|
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<thead>
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<tr>
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<th align="right">Property</th>
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<th align="left">Specification</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right">timestamp</td>
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<td align="left">timestamp</td>
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</tr>
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<tr>
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<td align="right">class</td>
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<td align="left">Java class</td>
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</tr>
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<tr>
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<td align="right">method</td>
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<td align="left">constructor and regular methods</td>
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</tr>
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<tr>
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<td align="right">total</td>
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<td align="left">calling times</td>
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</tr>
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<tr>
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<td align="right">success</td>
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<td align="left">success count</td>
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</tr>
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<tr>
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<td align="right">fail</td>
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<td align="left">failure count</td>
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</tr>
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<tr>
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<td align="right">rt</td>
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<td align="left">average RT</td>
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</tr>
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<tr>
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<td align="right">fail-rate</td>
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<td align="left">failure ratio</td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="parameters">
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<span id="parameters"></span><h2>Parameters<a class="headerlink" href="#parameters" title="Permalink to this headline">¶</a></h2>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th align="right">Name</th>
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<th align="left">Specification</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td align="right"><em>class-pattern</em></td>
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<td align="left">pattern for the class name</td>
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</tr>
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<tr>
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<td align="right"><em>method-pattern</em></td>
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<td align="left">pattern for the method name</td>
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</tr>
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<tr>
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<td align="right">[E]</td>
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<td align="left">turn on regx matching while the default is wildcards matching</td>
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</tr>
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<tr>
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<td align="right"><code>[c:]</code></td>
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<td align="left">cycle of output with default value: <code>120 s</code></td>
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</tr>
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</tbody>
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</table></div>
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<div class="section" id="usage">
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<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>$ monitor -c <span class="m">5</span> com.alibaba.sample.petstore.web.store.module.screen.ItemList execute
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Press Ctrl+C to abort.
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Affect<span class="o">(</span>class-cnt:1 , method-cnt:1<span class="o">)</span> cost in <span class="m">36</span> ms.
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
|
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<span class="m">2015</span>-12-17 <span class="m">10</span>:56:40 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="m">10</span> <span class="m">10</span> <span class="m">0</span> <span class="m">2</span>.00 <span class="m">0</span>.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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<span class="m">2015</span>-12-17 <span class="m">10</span>:56:45 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="m">11</span> <span class="m">11</span> <span class="m">0</span> <span class="m">2</span>.18 <span class="m">0</span>.00%
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timestamp class method total success fail rt fail-rate
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-----------------------------------------------------------------------------------------------------------------------------------
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<span class="m">2015</span>-12-17 <span class="m">10</span>:56:50 com.alibaba.sample.petstore.web.store.module.screen.ItemList execute <span class="m">0</span> <span class="m">0</span> <span class="m">0</span> <span class="m">0</span>.00 <span class="m">0</span>.00%
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</pre></div>
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</div>
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© Copyright 2018, Alibaba Middleware Group, and contributors.
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<div class="section" id="redefine">
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<span id="redefine"></span><h1>redefine<a class="headerlink" href="#redefine" title="Permalink to this headline">¶</a></h1>
|
||||
<p>Load the external <code class="docutils literal notranslate"><span class="pre">*.class</span></code> files and <em>re-define</em> the JVM-loaded classes.</p>
|
||||
<p>Reference: <a class="reference external" href="https://docs.oracle.com/javase/8/docs/api/java/lang/instrument/Instrumentation.html#redefineClasses-java.lang.instrument.ClassDefinition...-">Instrumentation#redefineClasses</a></p>
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<p>F.Y.I</p>
|
||||
<ol class="simple">
|
||||
<li>Re-defined classes cannot be restores any more;</li>
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<li>Re-definition can fail (like adding a new field); for more information, please refer to JDK documentation</li>
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<td align="right">[c:]</td>
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||||
<td align="left">hashcode of the class loader</td>
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||||
</tr>
|
||||
<tr>
|
||||
<td align="right">[p:]</td>
|
||||
<td align="left">absolute path of the external <code>*.class</code> (multiple paths supported)</td>
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||||
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<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
|
||||
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span> redefine -p /tmp/Test.class
|
||||
redefine -c 327a647b -p /tmp/Test.class /tmp/Test\$Inner.class
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