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data-v-64666cd5><div class="right-menu-margin" data-v-64666cd5><div class="right-menu-title" data-v-64666cd5>Table of Contents</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="arthas-async-jobs" tabindex="-1"><a class="header-anchor" href="#arthas-async-jobs" aria-hidden="true">#</a> Arthas Async Jobs</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials?language=en&amp;id=case-async-jobs" target="_blank" rel="noopener noreferrer"><code>Async Jobs</code> online tutorial<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></p><p>Asynchronous jobs in arthas. The idea is borrowed from <a href="http://man7.org/linux/man-pages/man1/jobs.1p.html" target="_blank" rel="noopener noreferrer">linux jobs<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a>.</p><h2 id="_1-use-to-run-the-command-in-the-background" tabindex="-1"><a class="header-anchor" href="#_1-use-to-run-the-command-in-the-background" aria-hidden="true">#</a> 1. Use &amp; to run the command in the background</h2><p>For example, execute the trace command in the background:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>trace Test t <span class="token operator">&amp;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>By doing this, the current command is put to the background to run, you can continue to execute other commands in the console.</p><h2 id="_2-list-background-jobs" tabindex="-1"><a class="header-anchor" href="#_2-list-background-jobs" aria-hidden="true">#</a> 2. List background jobs</h2><p>If you want to list all background jobs, you can execute the <code>jobs</code> command and the results are as follows:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">jobs</span>
<span class="token punctuation">[</span><span class="token number">10</span><span class="token punctuation">]</span>*
Stopped <span class="token function">watch</span> com.taobao.container.Test <span class="token builtin class-name">test</span> <span class="token string">&quot;params[0].{? #this.name == null }&quot;</span> <span class="token parameter variable">-x</span> <span class="token number">2</span>
execution count <span class="token builtin class-name">:</span> <span class="token number">19</span>
start <span class="token function">time</span> <span class="token builtin class-name">:</span> Fri Sep <span class="token number">22</span> 09:59:55 CST <span class="token number">2017</span>
<span class="token function">timeout</span> <span class="token function">date</span> <span class="token builtin class-name">:</span> Sat Sep <span class="token number">23</span> 09:59:55 CST <span class="token number">2017</span>
session <span class="token builtin class-name">:</span> 3648e874-5e69-473f-9eed-7f89660b079b <span class="token punctuation">(</span>current<span class="token punctuation">)</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>You can see that there is currently a background job executing:</p><ul><li>job id is 10, <code>*</code> indicates that this job is created by the current session.</li><li>status is <code>Stopped</code></li><li>execution count is the number of executions, which have been executed 19 times since the start.</li><li>timeout date: timeout timestamp, when the time exceeds this timestamp, the job will be automatically timeout and exit.</li></ul><h2 id="_3-suspend-and-cancel-job" tabindex="-1"><a class="header-anchor" href="#_3-suspend-and-cancel-job" aria-hidden="true">#</a> 3. Suspend and cancel job</h2><p>When the job is executing in the foreground, for example, directly executing the command <code>trace Test t</code>, or executing the background job command <code>trace Test t &amp;</code>, then putting the job back to the foreground via <code>fg</code> command, the console cannot continue to execute other command, but can receive and process the following keyboard events:</p><ul><li>‘ctrl + z’: Suspends the job, the job status will change to <code>Stopped</code>, and the job can be restarted by <code>bg &lt;job-id&gt;</code> or <code>fg &lt;job-id&gt;</code></li><li>‘ctrl + c’: Stops the job</li><li>‘ctrl + d’: According to linux semantics this should lead to exit the terminal, right now Arthas has not implemented this yet, therefore simply ignore this keystroke.</li></ul><h2 id="_4-fg-bg-switch-the-job-from-the-foreground-to-the-background-and-vise-verse" tabindex="-1"><a class="header-anchor" href="#_4-fg-bg-switch-the-job-from-the-foreground-to-the-background-and-vise-verse" aria-hidden="true">#</a> 4. fg/bg, switch the job from the foreground to the background, and vise verse</h2><ul><li>When a job is executed in the background or in suspended status (use <code>ctrl + z</code> to suspend job), <code>fg &lt;job-id&gt;</code> can transfer the job to the foreground to continue to run.</li><li>When a job is in suspended status (use <code>ctrl + z</code> to suspend job), <code>bg &lt;job-id&gt;</code> can put the job to the background to continue to run.</li><li>A job created by other session can only be put to the foreground to run by using <code>fg</code> in the current session.</li></ul><h2 id="_5-redirect-the-output" tabindex="-1"><a class="header-anchor" href="#_5-redirect-the-output" aria-hidden="true">#</a> 5. Redirect the output</h2><p>The job output can be redirect to the specified file by <code>&gt;</code> or <code>&gt;&gt;</code>, and can be used together with <code>&amp;</code>. By doing this, you can achieve running commands asynchronously, for example:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ trace Test t <span class="token operator">&gt;&gt;</span> test.out <span class="token operator">&amp;</span>
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>At this time, the trace command will be executed in the background, and the result will be output to the <code>test.out</code> file under the <code>working directory</code> of the application. You can continue to execute other commands. And you can view the command execution result in the file. You can execute the <code>pwd</code> command to view the <code>working directory</code> of the current application.</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ <span class="token function">cat</span> test.out
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>If no redirect file is specified, the result will be output to the <code>~/logs/arthas-cache/</code> directory, for example:</p><div class="language-bash ext-sh line-numbers-mode"><pre class="language-bash"><code>$ trace Test t <span class="token operator">&gt;&gt;</span> <span class="token operator">&amp;</span>
job <span class="token function">id</span> <span class="token builtin class-name">:</span> <span class="token number">2</span>
cache location <span class="token builtin class-name">:</span> /Users/admin/logs/arthas-cache/28198/2
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><p>At this time, the command will be executed asynchronously in the background, and the result will be asynchronously saved in the file (<code>~/logs/arthas-cache/${PID}/${JobId}</code>);</p><ul><li>At this time, the execution of the task is not affected by the session disconnection; the default timeout period of the task is 1 day, and the default timeout period can be modified through the global <code>options</code> command;</li><li>The result of this command will be output asynchronously to the file; at this time, regardless of whether <code>save-result</code> is true or not, the result will not be written asynchronously to <code>~/logs/arthas-cache/result.log</code>.</li></ul><h2 id="_6-stop-job" tabindex="-1"><a class="header-anchor" href="#_6-stop-job" aria-hidden="true">#</a> 6. Stop job</h2><p>If you want to stop background job, just <code>kill &lt;job-id&gt;</code>.</p><h2 id="_7-others" tabindex="-1"><a class="header-anchor" href="#_7-others" aria-hidden="true">#</a> 7. Others</h2><ul><li>Support up to 8 commands at the same time to redirect the output to the log files.</li><li>Do not open too many background jobs at the same time to avoid negative performance effect to the target JVM.</li><li>If you do not want to stop the Arthas service and continue to perform background tasks, you can exit the Arthas console by executing <code>quit</code> command (<code>stop</code> command will stop the Arthas service)</li></ul></div><!--[--><!--]--></div><footer class="page-meta right-menu-padding" data-v-fdd717e0><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/alibaba/arthas/edit/master/site/docs/en/doc/async.md" rel="noopener noreferrer" target="_blank" aria-label="Edit this page on GitHub"><!--[--><!--]--><span>Edit this page on GitHub</span><span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!--[--><!--]--></a></div><div class="meta-item last-updated"><span class="meta-item-label">Last Updated: </span><!----></div><div class="meta-item contributors"><span class="meta-item-label">Contributors: </span><span class="meta-item-info"><!--[--><!--[--><span class="contributor" title="email: hengyunabc@gmail.com">hengyunabc</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 26602940+0xflotus@users.noreply.github.com">0xflotus</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: arteevraina@gmail.com">Arteev Raina</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: hollowman186@vip.qq.com">Hollow Man</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: sergioescala@gmail.com">Sergio Escalante</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: ian.luo@gmail.com">beiwei30</span><!--[-->, <!--]--><!--]--><!--[--><span class="contributor" title="email: 983433479@qq.com">汪吉</span><!----><!--]--><!--]--></span></div></footer><nav class="page-nav right-menu-padding" data-v-fdd717e0><p class="inner"><!----><span class="next"><a href="/en/doc/save-log.html" class="" aria-label="Log command outputs"><!--[--><!--]--> Log command outputs <!--[--><!--]--></a></span></p></nav><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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