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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
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concurrency issues.</p></li><li><p>Monitoring and diagnostics: Regularly generating thread dump files can be used to monitor the health of an application
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and provide historical data for subsequent diagnostics. This helps gain a better understanding of the application's
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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,
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caution should be exercised when using it in a production environment, ensuring sufficient resources and permissions
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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? Join the conversation in <a href="https://datahub.com/slack?utm_source=docs&utm_medium=footer&utm_campaign=docs_footer&utm_content=docs/how/jattach-guide">Slack!</a></div></div><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/datahub-project/datahub/blob/master/docs/how/jattach-guide.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_VsjB"></div></div></footer><div class="feedbackWrapper_mUHF"><div class="feedbackWidget_PX4d"><div class="feedbackButtons_wn3V"><strong>Is this page helpful?</strong><div><button class="feedbackButton_UgQs"><span role="img" aria-label="like" class="anticon anticon-like"><svg viewBox="64 64 896 896" focusable="false" data-icon="like" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M885.9 533.7c16.8-22.2 26.1-49.4 26.1-77.7 0-44.9-25.1-87.4-65.5-111.1a67.67 67.67 0 00-34.3-9.3H572.4l6-122.9c1.4-29.7-9.1-57.9-29.5-79.4A106.62 106.62 0 00471 99.9c-52 0-98 35-111.8 85.1l-85.9 311H144c-17.7 0-32 14.3-32 32v364c0 17.7 14.3 32 32 32h601.3c9.2 0 18.2-1.8 26.5-5.4 47.6-20.3 78.3-66.8 78.3-118.4 0-12.6-1.8-25-5.4-37 16.8-22.2 26.1-49.4 26.1-77.7 0-12.6-1.8-25-5.4-37 16.8-22.2 26.1-49.4 26.1-77.7-.2-12.6-2-25.1-5.6-37.1zM184 852V568h81v284h-81zm636.4-353l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 16.5-7.2 32.2-19.6 43l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 16.5-7.2 32.2-19.6 43l-21.9 19 13.9 25.4a56.2 56.2 0 016.9 27.3c0 22.4-13.2 42.6-33.6 51.8H329V564.8l99.5-360.5a44.1 44.1 0 0142.2-32.3c7.6 0 15.1 2.2 21.1 6.7 9.9 7.4 15.2 18.6 14.6 30.5l-9.6 198.4h314.4C829 418.5 840 436.9 840 456c0 16.5-7.2 32.1-19.6 43z"></path></svg></span></button><button class="feedbackButton_UgQs"><span role="img" aria-label="dislike" class="anticon anticon-dislike"><svg viewBox="64 64 896 896" focusable="false" data-icon="dislike" width="1em" height="1em" fill="currentColor" aria-hidden="true"><path d="M885.9 490.3c3.6-12 5.4-24.4 5.4-37 0-28.3-9.3-55.5-26.1-77.7 3.6-12 5.4-24.4 5.4-37 0-28.3-9.3-55.5-26.1-77.7 3.6-12 5.4-24.4 5.4-37 0-51.6-30.7-98.1-78.3-118.4a66.1 66.1 0 00-26.5-5.4H144c-17.7 0-32 14.3-32 32v364c0 17.7 14.3 32 32 32h129.3l85.8 310.8C372.9 889 418.9 924 470.9 924c29.7 0 57.
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