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<div class="section" id="tt">
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<h1>tt<a class="headerlink" href="#tt" title="Permalink to this headline">¶</a></h1>
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<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>
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<p><code class="docutils literal notranslate"><span class="pre">watch</span></code> is a powerful command but due to its feasibility and complexity, it’s quite hard to locate the issue effectively.</p>
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<p>In such difficulties, <code class="docutils literal notranslate"><span class="pre">tt</span></code> comes into play.</p>
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<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>
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<div class="section" id="usage">
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<h2>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
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<div class="section" id="start-demo">
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<h3>Start Demo<a class="headerlink" href="#start-demo" title="Permalink to this headline">¶</a></h3>
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<p>Start <code class="docutils literal notranslate"><span class="pre">arthas-demo</span></code> in <a class="reference internal" href="quick-start.html"><span class="doc">Quick Start</span></a>.</p>
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</div>
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<div class="section" id="record-method-calls">
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<h3>Record method calls<a class="headerlink" href="#record-method-calls" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ tt -t demo.MathGame primeFactors
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Press Ctrl+C to abort.
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Affect(class-cnt:1 , method-cnt:1) cost in 66 ms.
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INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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1000 2018-12-04 11:15:38 1.096236 false true 0x4b67cf4d MathGame primeFactors
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1001 2018-12-04 11:15:39 0.191848 false true 0x4b67cf4d MathGame primeFactors
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1002 2018-12-04 11:15:40 0.069523 false true 0x4b67cf4d MathGame primeFactors
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1003 2018-12-04 11:15:41 0.186073 false true 0x4b67cf4d MathGame primeFactors
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1004 2018-12-04 11:15:42 17.76437 true false 0x4b67cf4d MathGame primeFactors</pre></div>
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</div>
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<ul>
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<li><p><code class="docutils literal notranslate"><span class="pre">-t</span></code></p>
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<p>record the calling context of the method <code class="docutils literal notranslate"><span class="pre">demo.MathGame</span> <span class="pre">primeFactors</span></code></p>
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</li>
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<li><p><code class="docutils literal notranslate"><span class="pre">-n</span> <span class="pre">3</span></code></p>
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<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>
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</li>
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<li><p>Property</p></li>
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</ul>
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<table border="1" class="docutils">
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<thead>
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<tr>
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<th>Name</th>
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<th>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>INDEX</td>
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<td>the index for each call based on time</td>
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</tr>
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<tr>
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<td>TIMESTAMP</td>
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<td>time to invoke the method</td>
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</tr>
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<tr>
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<td>COST(ms)</td>
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<td>time cost of the method call</td>
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</tr>
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<tr>
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<td>IS-RET</td>
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<td>whether method exits with normal return</td>
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</tr>
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<tr>
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<td>IS-EXP</td>
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<td>whether method failed with exceptions</td>
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</tr>
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<tr>
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<td>OBJECT</td>
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<td><code>hashCode()</code> of the object invoking the method</td>
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</tr>
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<tr>
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<td>CLASS</td>
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<td>class name of the object invoking the method</td>
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</tr>
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<tr>
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<td>METHOD</td>
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<td>method being invoked</td>
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</tr>
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</tbody>
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</table><ul class="simple">
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<li><p>Condition expression</p></li>
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</ul>
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<p>Tips:</p>
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<ol class="simple">
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<li><p><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.length==1</span></code> with different amounts of parameters;</p></li>
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<li><p><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;</p></li>
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<li><p><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.</p></li>
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</ol>
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<p>Advanced:</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="advice-class.html">Critical fields in expression</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://github.com/alibaba/arthas/issues/71">Special usage</a></li>
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<li class="toctree-l1"><a class="reference external" href="https://commons.apache.org/proper/commons-ognl/language-guide.html">OGNL official guide</a></li>
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</ul>
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</div>
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</div>
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<div class="section" id="list-all-records">
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<h3>List all records<a class="headerlink" href="#list-all-records" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ tt -l
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INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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1000 2018-12-04 11:15:38 1.096236 false true 0x4b67cf4d MathGame primeFactors
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1001 2018-12-04 11:15:39 0.191848 false true 0x4b67cf4d MathGame primeFactors
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1002 2018-12-04 11:15:40 0.069523 false true 0x4b67cf4d MathGame primeFactors
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1003 2018-12-04 11:15:41 0.186073 false true 0x4b67cf4d MathGame primeFactors
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1004 2018-12-04 11:15:42 17.76437 true false 0x4b67cf4d MathGame primeFactors
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9
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1005 2018-12-04 11:15:43 0.4776 false true 0x4b67cf4d MathGame primeFactors
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Affect(row-cnt:6) cost in 4 ms.</pre></div>
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</div>
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</div>
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<div class="section" id="searching-for-records">
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<h3>Searching for records<a class="headerlink" href="#searching-for-records" title="Permalink to this headline">¶</a></h3>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ tt -s 'method.name=="primeFactors"'
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INDEX TIMESTAMP COST(ms) IS-RET IS-EXP OBJECT CLASS METHOD
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-------------------------------------------------------------------------------------------------------------------------------------
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1000 2018-12-04 11:15:38 1.096236 false true 0x4b67cf4d MathGame primeFactors
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1001 2018-12-04 11:15:39 0.191848 false true 0x4b67cf4d MathGame primeFactors
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1002 2018-12-04 11:15:40 0.069523 false true 0x4b67cf4d MathGame primeFactors
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1003 2018-12-04 11:15:41 0.186073 false true 0x4b67cf4d MathGame primeFactors
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1004 2018-12-04 11:15:42 17.76437 true false 0x4b67cf4d MathGame primeFactors
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9
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1005 2018-12-04 11:15:43 0.4776 false true 0x4b67cf4d MathGame primeFactors
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Affect(row-cnt:6) cost in 607 ms.</pre></div>
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</div>
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<p>Advanced:</p>
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<div class="toctree-wrapper compound">
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<ul>
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<li class="toctree-l1"><a class="reference internal" href="advice-class.html">Critical fields in expression</a></li>
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</ul>
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</div>
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</div>
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<div class="section" id="check-context-of-the-call">
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<h3>Check context of the call<a class="headerlink" href="#check-context-of-the-call" title="Permalink to this headline">¶</a></h3>
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<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 calling details.</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ tt -i 1003
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INDEX 1003
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GMT-CREATE 2018-12-04 11:15:41
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COST(ms) 0.186073
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OBJECT 0x4b67cf4d
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CLASS demo.MathGame
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METHOD primeFactors
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IS-RETURN false
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IS-EXCEPTION true
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PARAMETERS[0] @Integer[-564322413]
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THROW-EXCEPTION java.lang.IllegalArgumentException: number is: -564322413, need >= 2
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at demo.MathGame.primeFactors(MathGame.java:46)
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at demo.MathGame.run(MathGame.java:24)
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at demo.MathGame.main(MathGame.java:16)
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Affect(row-cnt:1) cost in 11 ms.</pre></div>
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</div>
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</div>
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</div>
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<div class="section" id="replay-record">
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<h2>Replay record<a class="headerlink" href="#replay-record" title="Permalink to this headline">¶</a></h2>
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<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 replay the issue for advanced troubleshooting, option <code class="docutils literal notranslate"><span class="pre">--replay-times</span></code>
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define the replay execution times, option <code class="docutils literal notranslate"><span class="pre">--replay-interval</span></code> define the interval(unit in ms,with default value 1000) of replays</p>
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<div class="highlight-bash notranslate"><div class="highlight hljs"><pre class="bash">$ tt -i 1004 -p
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RE-INDEX 1004
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GMT-REPLAY 2018-12-04 11:26:00
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OBJECT 0x4b67cf4d
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CLASS demo.MathGame
|
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METHOD primeFactors
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|
PARAMETERS[0] @Integer[946738738]
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IS-RETURN true
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|
IS-EXCEPTION false
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RETURN-OBJ @ArrayList[
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@Integer[2],
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@Integer[11],
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@Integer[17],
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@Integer[2531387],
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]
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Time fragment[1004] successfully replayed.
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Affect(row-cnt:1) cost in 14 ms.</pre></div>
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</div>
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<p>F.Y.I</p>
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<ol>
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<li><p><strong>Loss</strong> of the <code class="docutils literal notranslate"><span class="pre">ThreadLocal</span></code></p>
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<p>Arthas save params into an array, then invoke the method with the params again. The method execute in another thread, so the <code class="docutils literal notranslate"><span class="pre">ThreadLocal</span></code> <strong>lost</strong>.</p>
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</li>
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<li><p>params may be modified</p>
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<p>Arthas save params into an array, they are object references. The Objects may be modified by other code.</p>
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</li>
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</ol>
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</div>
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