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padding-bottom--lg"><div class="row"><div class="col docItemCol_VOVn"><div class="docItemContainer_Djhp"><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label="Breadcrumbs"><ul class="breadcrumbs" itemscope="" itemtype="https://schema.org/BreadcrumbList"><li class="breadcrumbs__item"><a aria-label="Home page" class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Advanced Guides</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Debugging by Jattach</span><meta itemprop="position" content="2"></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: Next</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><p>We have installed jattach in Docker image of datahub-gms, datahub-mae-consumer, datahub-mce-consumer
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and datahub-frontend to facilitating troubleshooting in a production environment.</p><h1>Introduction to Jattach</h1><p>Jattach is a utility to send commands to a JVM process via Dynamic Attach mechanism.</p><p>Supported commands:</p><ul><li>load : load agent library</li><li>properties : print system properties</li><li>agentProperties : print agent properties</li><li>datadump : show heap and thread summary</li><li>threaddump : dump all stack traces (like jstack)</li><li>dumpheap : dump heap (like jmap)</li><li>inspectheap : heap histogram (like jmap -histo)</li><li>setflag : modify manageable VM flag</li><li>printflag : print VM flag</li><li>jcmd : execute jcmd command</li></ul><h1>Use examples</h1><p>Jattach is a All-in-one <strong>jmap + jstack + jcmd + jinfo</strong> functionality in a single tiny program.
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The scenarios where these commands were previously used can now be replaced with jattach.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="example-1-dump-heap">Example 1: Dump heap<a href="#example-1-dump-heap" class="hash-link" aria-label="Direct link to Example 1: Dump heap" title="Direct link to Example 1: Dump heap"></a></h2><p>The jattach dumpheap command is typically used in the following scenarios:</p><ul><li><p>Memory leak analysis: When an application experiences memory leaks or abnormal memory growth, the jattach dumpheap
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command is used to generate a heap dump file for further analysis and identification of the memory leak causes.</p></li><li><p>Memory analysis: By generating a heap dump file, various memory analysis tools such as Eclipse Memory Analyzer and
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VisualVM can be utilized to analyze objects, reference relationships, and memory usage within the heap. This helps
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identify potential performance issues and optimization opportunities.</p></li><li><p>Troubleshooting: When encountering frequent Full GCs, memory out-of-memory errors, or other memory-related issues,
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generating a heap dump file provides additional information for troubleshooting and debugging purposes.</p></li><li><p>Performance optimization: By analyzing the heap dump file, it becomes possible to identify which objects in the
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application consume a significant amount of memory. This information can be used for targeted performance optimizations,
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such as reducing object creation or optimizing cache usage.</p></li></ul><p>It's important to note that generating a heap dump file can have an impact on the performance of the application.
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Therefore, caution should be exercised when using it in a production environment, ensuring sufficient resources and
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permissions are available for the operation.</p><p>The command is as follows:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">jattach </span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">pid</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> dumpheap /tmp/heap.bin</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="example-2-dump-thread">Example 2: Dump thread<a href="#example-2-dump-thread" class="hash-link" aria-label="Direct link to Example 2: Dump thread" title="Direct link to Example 2: Dump thread"></a></h2><p>The jattach threaddump command is typically used in the following scenarios:</p><ul><li><p>Deadlock analysis: When an application experiences deadlocks or thread contention issues, the jattach threaddump
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command is used to generate a thread dump file. It provides the current thread's stack trace information, helping to
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identify the code paths and lock contention causing the deadlock.</p></li><li><p>Thread troubleshooting: When threads in an application encounter exceptions, long blocking times, excessive CPU usage,
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or other issues, generating a thread dump file provides detailed information about each thread's state, stack trace, and
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resource usage. This helps with troubleshooting and analysis.</p></li><li><p>Performance analysis: By generating a thread dump file, it becomes possible to understand the thread activity, call
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||
paths, and resource contention within the application. This aids in identifying potential performance bottlenecks and
|
||
concurrency issues.</p></li><li><p>Monitoring and diagnostics: Regularly generating thread dump files can be used to monitor the health of an application
|
||
and provide historical data for subsequent diagnostics. This helps gain a better understanding of the application's
|
||
behavior and performance.</p></li></ul><p>It's important to note that generating a thread dump file may impact the performance of the application. Therefore,
|
||
caution should be exercised when using it in a production environment, ensuring sufficient resources and permissions
|
||
are available for the operation.</p><p>The command is as follows:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">jattach </span><span class="token operator" style="color:rgb(137, 221, 255)"><</span><span class="token plain">pid</span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> threaddump -l </span><span class="token operator" style="color:rgb(137, 221, 255)">></span><span class="token plain"> /tmp/jstack.out</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="slackUtm_uoBr"><div class="slackUtm_uoBr"><hr>Need more help? 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