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6 years ago
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Critical Fields in Expressions
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==============================
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There is a very fundamental class `Advice` for the expressions used in filtering, tracing or monitoring and other aspects in commands.
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```java
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public class Advice {
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private final ClassLoader loader;
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private final Class<?> clazz;
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private final ArthasMethod method;
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private final Object target;
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private final Object[] params;
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private final Object returnObj;
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private final Throwable throwExp;
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private final boolean isBefore;
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private final boolean isThrow;
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private final boolean isReturn;
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...
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// getter/setter
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}
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```
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|Name|Specification|
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|---:|:---|
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|loader|class loader of the class|
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|clazz|the reference of the class|
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|method|the reflective reference of the method|
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|target|the instance of the class|
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|params|the parameters of the method, which is an array (when there is no argument in the method, it will be an empty array)|
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|returnObj|the return value of the method - only when `isReturn==true`, it's a valid result but if the return value is `void` then it will be a `null`|
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|throwExp|the exceptions thrown by the method invoking - only when `isThrow==true`, it's a valid thrown exception|
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|isBefore|assistant checking flag used in [`before-watching` point](watch.md) and at this very moment: `isBefore==true`, `isThrow==false` and `isReturn==false` since it's before we invoke the method|
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|isThrow|assistant checking flag: whether the current method invoking ends with exceptions|
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|isReturn|assistant checking flag: whether the method invoking exits normally without exceptions|
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F.Y.I
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1. all the *fields* mentioned in the table above can be used directly in the `expressions`;
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2. if the expressions are [invalid OGNL](https://en.wikipedia.org/wiki/OGNL), the command will be cancelled automatically with hints to correct the expressions;
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3. [typical use cases](https://github.com/alibaba/arthas/issues/71);
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4. [OGNL official usage guide](https://commons.apache.org/proper/commons-ognl/language-guide.html).
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Batch Processing
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================
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With the help of `Batch Processing`, you can run several commands in one line and get the results.
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### Usage
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#### Step-1: Create the script
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Creating a `test.as` script suffixed with `as` here for consistency (actually any suffix is acceptable).
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```
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➜ arthas git:(develop) cat /var/tmp/test.as
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help
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dashboard -b -n 1
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session
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thread
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sc -d org.apache.commons.lang.StringUtils
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```
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Attention:
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* each command takes each independent line;
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* `dashboard` command should include `-b` to turn on batch mode and `-n` to ensure the script ends;
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* commands as `watch/tt/trace/monitor/stack` should include `-n` option to ensure the script ends;
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* [asynchronous](async.md) can also be used as `watch c.t.X test returnObj > &`;
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#### Step-2: Run the script
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Using `-b` to turn on script mode, and `-f` to run it and you can also *redirect* the output as:
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```sh
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./as.sh -b -f /var/tmp/test.as 56328 > test.out
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```
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#### Step-3: Check the outputs
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```sh
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cat test.out
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```
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@ -0,0 +1,31 @@
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Manual Installation
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===================
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### Download
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Latest `bin.zip `: [](http://search.maven.org/classic/#search%7Cga%7C1%7Cg%3A%22com.taobao.arthas%22%20AND%20a%3A%22arthas-packaging%22)
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If the downloading is rather clumsy, try to download from the [repository in AliYun](https://maven.aliyun.com/); the downloading URL template is (remember to fill up the version `3.x.x` template to your needs)
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`https://maven.aliyun.com/repository/public/com/taobao/arthas/arthas-packaging/3.x.x/arthas-packaging-3.x.x-bin.zip`
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### Unzip
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```bash
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unzip arthas-packaging-bin.zip
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```
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### Install
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```bash
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sudo su admin
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rm -rf /home/admin/.arthas/lib/* # remove all the leftover of the old outdated Arthas
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cd arthas
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./install-local.sh # switch the user based on the owner of the target Java process.
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```
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### Start
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```bash
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./as.sh # make sure the old Arthas has been shut down (using command shutdown);
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```
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Log command outputs
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===================
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Log command outputs for later analysis, turned off by default.
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To turn it on, using [options](options.md) as:
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```sh
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$ options save-result true
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NAME BEFORE-VALUE AFTER-VALUE
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----------------------------------------
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save-result false true
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Affect(row-cnt:1) cost in 3 ms.
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```
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F.Y.I
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1. logging file lies in: `{user.home}/logs/arthas-cache/result.log`;
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2. remember to clean up the file to save disk space.
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### Asynchronous log
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:notes: :notes:
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With the latest Arthas, you can log the outputs asynchronously in the background:
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```sh
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$ trace Test t >> &
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job id : 2
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cache location : /Users/zhuyong/logs/arthas-cache/28198/2
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```
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F.Y.I
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1. `quit/exit` or `Ctrl+C` will not affect the asynchronous jobs :sparkles:;
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2. default timeout for the background job is 1 day (you can set it via [options](options.md));
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3. outputs will be save to the `cache location` now (no matter what `save-result` is - not `~/logs/arthas-cache/result.log` any more).
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@ -0,0 +1,361 @@
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<div class="section" id="critical-fields-in-expressions">
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<span id="critical-fields-in-expressions"></span><h1>Critical Fields in Expressions<a class="headerlink" href="#critical-fields-in-expressions" title="Permalink to this headline">¶</a></h1>
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<p>There is a very fundamental class <code class="docutils literal notranslate"><span class="pre">Advice</span></code> for the expressions used in filtering, tracing or monitoring and other aspects in commands.</p>
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<div class="highlight-java notranslate"><div class="highlight"><pre><span></span><span class="kd">public</span> <span class="kd">class</span> <span class="nc">Advice</span> <span class="o">{</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">ClassLoader</span> <span class="n">loader</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Class</span><span class="o"><?></span> <span class="n">clazz</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">ArthasMethod</span> <span class="n">method</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Object</span> <span class="n">target</span><span class="o">;</span>
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Object</span><span class="o">[]</span> <span class="n">params</span><span class="o">;</span>
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||||||
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<span class="kd">private</span> <span class="kd">final</span> <span class="n">Object</span> <span class="n">returnObj</span><span class="o">;</span>
|
||||||
|
<span class="kd">private</span> <span class="kd">final</span> <span class="n">Throwable</span> <span class="n">throwExp</span><span class="o">;</span>
|
||||||
|
<span class="kd">private</span> <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">isBefore</span><span class="o">;</span>
|
||||||
|
<span class="kd">private</span> <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">isThrow</span><span class="o">;</span>
|
||||||
|
<span class="kd">private</span> <span class="kd">final</span> <span class="kt">boolean</span> <span class="n">isReturn</span><span class="o">;</span>
|
||||||
|
<span class="o">...</span>
|
||||||
|
<span class="c1">// getter/setter </span>
|
||||||
|
<span class="o">}</span>
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
<table border="1" class="docutils">
|
||||||
|
<thead>
|
||||||
|
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|
||||||
|
<th align="right">Name</th>
|
||||||
|
<th align="left">Specification</th>
|
||||||
|
</tr>
|
||||||
|
</thead>
|
||||||
|
<tbody>
|
||||||
|
<tr>
|
||||||
|
<td align="right">loader</td>
|
||||||
|
<td align="left">class loader of the class</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">clazz</td>
|
||||||
|
<td align="left">the reference of the class</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">method</td>
|
||||||
|
<td align="left">the reflective reference of the method</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">target</td>
|
||||||
|
<td align="left">the instance of the class</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">params</td>
|
||||||
|
<td align="left">the parameters of the method, which is an array (when there is no argument in the method, it will be an empty array)</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">returnObj</td>
|
||||||
|
<td align="left">the return value of the method - only when <code>isReturn==true</code>, it's a valid result but if the return value is <code>void</code> then it will be a <code>null</code></td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">throwExp</td>
|
||||||
|
<td align="left">the exceptions thrown by the method invoking - only when <code>isThrow==true</code>, it's a valid thrown exception</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">isBefore</td>
|
||||||
|
<td align="left">assistant checking flag used in <a href="watch.md"><code>before-watching</code> point</a> and at this very moment: <code>isBefore==true</code>, <code>isThrow==false</code> and <code>isReturn==false</code> since it's before we invoke the method</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">isThrow</td>
|
||||||
|
<td align="left">assistant checking flag: whether the current method invoking ends with exceptions</td>
|
||||||
|
</tr>
|
||||||
|
<tr>
|
||||||
|
<td align="right">isReturn</td>
|
||||||
|
<td align="left">assistant checking flag: whether the method invoking exits normally without exceptions</td>
|
||||||
|
</tr>
|
||||||
|
</tbody>
|
||||||
|
</table><p>F.Y.I</p>
|
||||||
|
<ol class="simple">
|
||||||
|
<li>all the <em>fields</em> mentioned in the table above can be used directly in the <code class="docutils literal notranslate"><span class="pre">expressions</span></code>;</li>
|
||||||
|
<li>if the expressions are <a class="reference external" href="https://en.wikipedia.org/wiki/OGNL">invalid OGNL</a>, the command will be cancelled automatically with hints to correct the expressions;</li>
|
||||||
|
<li><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">typical use cases</a>;</li>
|
||||||
|
<li><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official usage guide</a>.</li>
|
||||||
|
</ol>
|
||||||
|
</div>
|
||||||
|
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||||||
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<div class="section" id="batch-processing">
|
||||||
|
<span id="batch-processing"></span><h1>Batch Processing<a class="headerlink" href="#batch-processing" title="Permalink to this headline">¶</a></h1>
|
||||||
|
<p>With the help of <code class="docutils literal notranslate"><span class="pre">Batch</span> <span class="pre">Processing</span></code>, you can run several commands in one line and get the results.</p>
|
||||||
|
<div class="section" id="usage">
|
||||||
|
<span id="usage"></span><h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
|
||||||
|
<div class="section" id="step-1-create-the-script">
|
||||||
|
<span id="step-1-create-the-script"></span><h3>Step-1: Create the script<a class="headerlink" href="#step-1-create-the-script" title="Permalink to this headline">¶</a></h3>
|
||||||
|
<p>Creating a <code class="docutils literal notranslate"><span class="pre">test.as</span></code> script suffixed with <code class="docutils literal notranslate"><span class="pre">as</span></code> here for consistency (actually any suffix is acceptable).</p>
|
||||||
|
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>➜ arthas git:(develop) cat /var/tmp/test.as
|
||||||
|
help
|
||||||
|
dashboard -b -n 1
|
||||||
|
session
|
||||||
|
thread
|
||||||
|
sc -d org.apache.commons.lang.StringUtils
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
<p>Attention:</p>
|
||||||
|
<ul class="simple">
|
||||||
|
<li>each command takes each independent line;</li>
|
||||||
|
<li><code class="docutils literal notranslate"><span class="pre">dashboard</span></code> command should include <code class="docutils literal notranslate"><span class="pre">-b</span></code> to turn on batch mode and <code class="docutils literal notranslate"><span class="pre">-n</span></code> to ensure the script ends;</li>
|
||||||
|
<li>commands as <code class="docutils literal notranslate"><span class="pre">watch/tt/trace/monitor/stack</span></code> should include <code class="docutils literal notranslate"><span class="pre">-n</span></code> option to ensure the script ends;</li>
|
||||||
|
<li><a class="reference external" href="https://github.com/alibaba/arthas/tree/master/site/src/site/sphinx/en/async.md">asynchronous</a> can also be used as <code class="docutils literal notranslate"><span class="pre">watch</span> <span class="pre">c.t.X</span> <span class="pre">test</span> <span class="pre">returnObj</span> <span class="pre">></span> <span class="pre">&</span></code>;</li>
|
||||||
|
</ul>
|
||||||
|
</div>
|
||||||
|
<div class="section" id="step-2-run-the-script">
|
||||||
|
<span id="step-2-run-the-script"></span><h3>Step-2: Run the script<a class="headerlink" href="#step-2-run-the-script" title="Permalink to this headline">¶</a></h3>
|
||||||
|
<p>Using <code class="docutils literal notranslate"><span class="pre">-b</span></code> to turn on script mode, and <code class="docutils literal notranslate"><span class="pre">-f</span></code> to run it and you can also <em>redirect</em> the output as:</p>
|
||||||
|
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>./as.sh -b -f /var/tmp/test.as <span class="m">56328</span> > test.out
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
</div>
|
||||||
|
<div class="section" id="step-3-check-the-outputs">
|
||||||
|
<span id="step-3-check-the-outputs"></span><h3>Step-3: Check the outputs<a class="headerlink" href="#step-3-check-the-outputs" title="Permalink to this headline">¶</a></h3>
|
||||||
|
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<div class="section" id="manual-installation">
|
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|
<span id="manual-installation"></span><h1>Manual Installation<a class="headerlink" href="#manual-installation" title="Permalink to this headline">¶</a></h1>
|
||||||
|
<div class="section" id="download">
|
||||||
|
<span id="download"></span><h2>Download<a class="headerlink" href="#download" title="Permalink to this headline">¶</a></h2>
|
||||||
|
<p>Latest <code class="docutils literal notranslate"><span class="pre">bin.zip</span></code>: <a class="reference external" href="http://search.maven.org/classic/#search%7Cga%7C1%7Cg%3A%22com.taobao.arthas%22%20AND%20a%3A%22arthas-packaging%22"><img alt="Arthas" src="https://img.shields.io/maven-central/v/com.taobao.arthas/arthas-packaging.svg?style=flat-square" /></a></p>
|
||||||
|
<p>If the downloading is rather clumsy, try to download from the <a class="reference external" href="https://maven.aliyun.com/">repository in AliYun</a>; the downloading URL template is (remember to fill up the version <code class="docutils literal notranslate"><span class="pre">3.x.x</span></code> template to your needs)</p>
|
||||||
|
<p><code class="docutils literal notranslate"><span class="pre">https://maven.aliyun.com/repository/public/com/taobao/arthas/arthas-packaging/3.x.x/arthas-packaging-3.x.x-bin.zip</span></code></p>
|
||||||
|
</div>
|
||||||
|
<div class="section" id="unzip">
|
||||||
|
<span id="unzip"></span><h2>Unzip<a class="headerlink" href="#unzip" title="Permalink to this headline">¶</a></h2>
|
||||||
|
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>unzip arthas-packaging-bin.zip
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
</div>
|
||||||
|
<div class="section" id="install">
|
||||||
|
<span id="install"></span><h2>Install<a class="headerlink" href="#install" title="Permalink to this headline">¶</a></h2>
|
||||||
|
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>sudo su admin
|
||||||
|
rm -rf /home/admin/.arthas/lib/* <span class="c1"># remove all the leftover of the old outdated Arthas</span>
|
||||||
|
<span class="nb">cd</span> arthas
|
||||||
|
./install-local.sh <span class="c1"># switch the user based on the owner of the target Java process.</span>
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
</div>
|
||||||
|
<div class="section" id="start">
|
||||||
|
<span id="start"></span><h2>Start<a class="headerlink" href="#start" title="Permalink to this headline">¶</a></h2>
|
||||||
|
<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>./as.sh <span class="c1"># make sure the old Arthas has been shut down (using command shutdown);</span>
|
||||||
|
</pre></div>
|
||||||
|
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|
||||||
|
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|
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<li><a href="index.html">Docs</a> »</li>
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<li>Log command outputs</li>
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<li class="wy-breadcrumbs-aside">
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<hr/>
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</div>
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<div class="section" id="log-command-outputs">
|
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<span id="log-command-outputs"></span><h1>Log command outputs<a class="headerlink" href="#log-command-outputs" title="Permalink to this headline">¶</a></h1>
|
||||||
|
<p>Log command outputs for later analysis, turned off by default.</p>
|
||||||
|
<p>To turn it on, using <a class="reference internal" href="options.html"><span class="doc">options</span></a> as:</p>
|
||||||
|
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ options save-result <span class="nb">true</span>
|
||||||
|
NAME BEFORE-VALUE AFTER-VALUE
|
||||||
|
----------------------------------------
|
||||||
|
save-result <span class="nb">false</span> <span class="nb">true</span>
|
||||||
|
Affect<span class="o">(</span>row-cnt:1<span class="o">)</span> cost in <span class="m">3</span> ms.
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
<p>F.Y.I</p>
|
||||||
|
<ol class="simple">
|
||||||
|
<li>logging file lies in: <code class="docutils literal notranslate"><span class="pre">{user.home}/logs/arthas-cache/result.log</span></code>;</li>
|
||||||
|
<li>remember to clean up the file to save disk space.</li>
|
||||||
|
</ol>
|
||||||
|
<div class="section" id="asynchronous-log">
|
||||||
|
<span id="asynchronous-log"></span><h2>Asynchronous log<a class="headerlink" href="#asynchronous-log" title="Permalink to this headline">¶</a></h2>
|
||||||
|
<p>:notes: :notes:
|
||||||
|
With the latest Arthas, you can log the outputs asynchronously in the background:</p>
|
||||||
|
<div class="highlight-sh notranslate"><div class="highlight"><pre><span></span>$ trace Test t >> <span class="p">&</span>
|
||||||
|
job id : <span class="m">2</span>
|
||||||
|
cache location : /Users/zhuyong/logs/arthas-cache/28198/2
|
||||||
|
</pre></div>
|
||||||
|
</div>
|
||||||
|
<p>F.Y.I</p>
|
||||||
|
<ol class="simple">
|
||||||
|
<li><code class="docutils literal notranslate"><span class="pre">quit/exit</span></code> or <code class="docutils literal notranslate"><span class="pre">Ctrl+C</span></code> will not affect the asynchronous jobs :sparkles:;</li>
|
||||||
|
<li>default timeout for the background job is 1 day (you can set it via <a class="reference internal" href="options.html"><span class="doc">options</span></a>);</li>
|
||||||
|
<li>outputs will be save to the <code class="docutils literal notranslate"><span class="pre">cache</span> <span class="pre">location</span></code> now (no matter what <code class="docutils literal notranslate"><span class="pre">save-result</span></code> is - not <code class="docutils literal notranslate"><span class="pre">~/logs/arthas-cache/result.log</span></code> any more).</li>
|
||||||
|
</ol>
|
||||||
|
</div>
|
||||||
|
</div>
|
||||||
|
|
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|
||||||
|
<p>
|
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|
© Copyright 2018, Alibaba Middleware Group, and contributors.
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</p>
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</section>
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