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notes</a></div></li></ul></nav></div></div></aside><main class="docMainContainer_gTbr"><div class="container padding-top--md padding-bottom--lg"><div class="row"><div class="col docItemCol_z5aJ"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is unreleased documentation for <!-- -->Apache Doris<!-- --> <b>Dev</b> version.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/admin-manual/memory-management/memory-limit-exceeded-analysis">latest version</a></b> (<!-- -->2.1<!-- -->).</div></div><div class="docItemContainer_c0TR"><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">Managing Doris</span><meta itemprop="position" content="1"></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Managing Memory</span><meta itemprop="position" content="2"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Memory Limit Exceeded Analysis</span><meta itemprop="position" content="3"></li></ul></nav><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"><header><h1>Memory Limit Exceeded Analysis</h1></header><h1>Memory Limit Exceeded Analysis</h1><span class="version-mark paragraph"><span class="v-mark"><span class="version-tags"><span class="version-tag"><span class="version-tag-t">Since</span><span class="version-tag-n since">Version <!-- -->1.2.0</span></span></span></span><p>When the query or import error <code>Memory limit exceeded</code> is reported, the possible reasons are: the process memory exceeds the limit, the remaining available memory of the system is insufficient, and the memory limit for a single query execution is exceeded.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">ERROR 1105 (HY000): errCode = 2, detailMessage = Memory limit exceeded:<consuming tracker:<xxx>, xxx. backend 172.1.1.1 process memory used xxx GB, limit xxx GB. If query tracker exceeded, `set exec_mem_limit=8G ` to change limit, details mem usage see be. INFO.</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="the-process-memory-exceeds-the-limit-or-the-remaining-available-memory-of-the-system-is-insufficient">The process memory exceeds the limit OR the remaining available memory of the system is insufficient<a href="#the-process-memory-exceeds-the-limit-or-the-remaining-available-memory-of-the-system-is-insufficient" class="hash-link" aria-label="Direct link to The process memory exceeds the limit OR the remaining available memory of the system is insufficient" title="Direct link to The process memory exceeds the limit OR the remaining available memory of the system is insufficient"></a></h2><p>When the following error is returned, it means that the process memory exceeds the limit, or the remaining available memory of the system is insufficient. The specific reason depends on the memory statistics.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">ERROR 1105 (HY000): errCode = 2, detailMessage = Memory limit exceeded:<consuming tracker:<Query#Id=3c88608cf35c461d-95fe88969aa6fc30>, process memory used 2.68 GB exceed limit 2.47 GB or sys mem available 50.95 GB less than low water mark 3.20 GB, failed alloc size 2.00 MB>, executing msg:<execute:<ExecNode:VAGGREGATION_NODE (id=7)>>. backend 172.1.1.1 process memory used 2.68 GB, limit 2.47 GB. If query tracker exceeded, `set exec_mem_limit =8G` to change limit, details mem usage see be.INFO</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="error-message-analysis">Error message analysis<a href="#error-message-analysis" class="hash-link" aria-label="Direct link to Error message analysis" title="Direct link to Error message analysis"></a></h3><p>The error message is divided into three parts:</p><ol><li><code>Memory limit exceeded:<consuming tracker:<Query#Id=3c88608cf35c461d-95fe88969aa6fc30></code>: It is found that the memory limit is exceeded during the memory application process of query <code>3c88608cf35c461d-95fe88969aa6fc30</code>.</li><li><code>process memory used 2.68 GB exceed limit 2.47 GB or sys mem available 50.95 GB less than low water mark 3.20 GB, failed alloc size 2.00 MB</code>: The reason for exceeding the limit is that the 2.68GB of memory used by the BE process exceeds the limit of 2.47GB limit, the value of limit comes from mem_limit * system MemTotal in be.conf, which is equal to 80% of the total memory of the operating system by default. The remaining available memory of the current operating system is 50.95 GB, which is still higher than the minimum water level of 3.2GB. This time, we are trying to apply for 2MB of memory.</li><li><code>executing msg:<execute:<ExecNode:VAGGREGATION_NODE (id=7)>>, backend 172.24.47.117 process memory used 2.68 GB, limit 2.47 GB</code>: The location of this memory application is <code>ExecNode:VAGGREGATION_NODE (id= 7)></code>, the current IP of the BE node is 172.1.1.1, and print the memory statistics of the BE node again.</li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="log-analysis">Log Analysis<a href="#log-analysis" class="hash-link" aria-label="Direct link to Log Analysis" title="Direct link to Log Analysis"></a></h3><p>At the same time, you can find the following log in log/be.INFO to confirm whether the memory usage of the current process meets expectations. The log is also divided into three parts:</p><ol><li><code>Process Memory Summary</code>: process memory statistics.</li><li><code>Alloc Stacktrace</code>: The stack that triggers the memory overrun detection, which is not necessarily the location of the large memory application.</li><li><code>Memory Tracker Summary</code>: Process memory tracker statistics, refer to <a href="/docs/dev/admin-manual/memory-management/memory-tracker">Memory Tracker</a> to analyze the location of memory usage. |
| Notice:</li><li>The printing interval of the process memory overrun log is 1s. After the process memory exceeds the limit, the memory applications in most locations of BE will sense it, and try to make a predetermined callback method, and print the process memory overrun log, so if the log is If the value of Try Alloc is small, you don’t need to pay attention to <code>Alloc Stacktrace</code>, just analyze <code>Memory Tracker Summary</code> directly.</li><li>When the process memory exceeds the limit, BE will trigger memory GC.</li></ol><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">W1127 17:23:16.372572 19896 mem_tracker_limiter.cpp:214] System Mem Exceed Limit Check Failed, Try Alloc: 1062688</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Process Memory Summary:</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> process memory used 2.68 GB limit 2.47 GB, sys mem available 50.95 GB min reserve 3.20 GB, tc/jemalloc allocator cache 51.97 MB</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Alloc Stacktrace:</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x50028e8 doris::MemTrackerLimiter::try_consume()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x50027c1 doris::ThreadMemTrackerMgr::flush_untracked_mem<>()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x595f234 malloc</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0xb888c18 operator new()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x8f316a2 google::LogMessage::Init()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5813fef doris::FragmentExecState::coordinator_callback()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x58383dc doris::PlanFragmentExecutor::send_report()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5837ea8 doris::PlanFragmentExecutor::update_status()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x58355b0 doris::PlanFragmentExecutor::open()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5815244 doris::FragmentExecState::execute()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5817965 doris::FragmentMgr::_exec_actual()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x581fffb std::_Function_handler<>::_M_invoke()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5a6f2c1 doris::ThreadPool::dispatch_thread()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5a6843f doris::Thread::supervise_thread()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x7feb54f931ca start_thread</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x7feb5576add3 __GI___clone</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ (nil) (unknown)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Memory Tracker Summary:</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=consistency, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=batch_load, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=clone, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=schema_change, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=compaction, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=load, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=query, Used=206.67 MB(216708729 B), Peak=565.26 MB(592723181 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=global, Used=930.42 MB(975614571 B), Peak=1017.42 MB(1066840223 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=tc/jemalloc_cache, Used=51.97 MB(54494616 B), Peak=-1.00 B(-1 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> Type=process, Used=1.16 GB(1246817916 B), Peak=-1.00 B(-1 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=Orphan, Type=global, Limit=-1.00 B(-1 B), Used=474.20 MB(497233597 B), Peak=649.18 MB(680718208 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=BufferAllocator, Parent Label=Orphan, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=LoadChannelMgr, Parent Label=Orphan, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=StorageEngine, Parent Label=Orphan, Used=320.56 MB(336132488 B), Peak=322.56 MB(338229824 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=SegCompaction, Parent Label=Orphan, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=SegmentMeta, Parent Label=Orphan, Used=948.64 KB(971404 B), Peak=943.64 KB(966285 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=TabletManager, Parent Label=Orphan, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=DataPageCache, Type=global, Limit=-1.00 B(-1 B), Used=455.22 MB(477329882 B), Peak=454.18 MB(476244180 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=IndexPageCache, Type=global, Limit=-1.00 B(-1 B), Used=1.00 MB(1051092 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=SegmentCache, Type=global, Limit=-1.00 B(-1 B), Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=DiskIO, Type=global, Limit=2.47 GB(2655423201 B), Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=ChunkAllocator, Type=global, Limit=-1.00 B(-1 B), Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=LastSuccessChannelCache, Type=global, Limit=-1.00 B(-1 B), Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=DeleteBitmap AggCache, Type=global, Limit=-1.00 B(-1 B), Used=0(0 B), Peak=0(0 B)</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="system-remaining-available-memory-calculation">System remaining available memory calculation<a href="#system-remaining-available-memory-calculation" class="hash-link" aria-label="Direct link to System remaining available memory calculation" title="Direct link to System remaining available memory calculation"></a></h3><p>When the available memory of the system in the error message is less than the low water mark, it is also treated as a process memory limit. The value of the available memory of the system comes from <code>MemAvailable</code> in <code>/proc/meminfo</code>. When <code>MemAvailable</code> is insufficient, continue to use the memory The application may return std::bad_alloc or cause OOM of the BE process. Because both refreshing process memory statistics and BE memory GC have a certain lag, a small part of the memory buffer is reserved as a low water mark to avoid OOM as much as possible.</p><p>Among them, <code>MemAvailable</code> is the total amount of memory that the operating system can provide to the user process without triggering swap as much as possible given by the operating system considering the current free memory, buffer, cache, memory fragmentation and other factors. A simple calculation Formula: MemAvailable = MemFree - LowWaterMark + (PageCache - min(PageCache / 2, LowWaterMark)), which is the same as the <code>available</code> value seen by cmd <code>free</code>, for details, please refer to: |
| <a href="https://serverfault.com/questions/940196/why-is-memaavailable-a-lot-less-than-memfreebufferscached" target="_blank" rel="noopener noreferrer">https://serverfault.com/questions/940196/why-is-memaavailable-a-lot-less-than-memfreebufferscached</a> |
| <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773" target="_blank" rel="noopener noreferrer">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=34e431b0ae398fc54ea69ff85ec700722c9da773</a></p><p>The low water mark defaults to a maximum of 1.6G, calculated based on <code>MemTotal</code>, <code>vm/min_free_kbytes</code>, <code>confg::mem_limit</code>, <code>config::max_sys_mem_available_low_water_mark_bytes</code>, and avoid wasting too much memory. Among them, <code>MemTotal</code> is the total memory of the system, and the value also comes from <code>/proc/meminfo</code>; <code>vm/min_free_kbytes</code> is the buffer reserved by the operating system for the memory GC process, and the value is usually between 0.4% and 5%. <code>vm/min_free_kbytes</code> may be 5% on some cloud servers, which will lead to visually that the available memory of the system is less than the real value; increasing <code>config::max_sys_mem_available_low_water_mark_bytes</code> will reserve more for Full GC on machines with more than 16G memory If there are more memory buffers, otherwise, the memory will be fully used as much as possible.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="query-or-import-a-single-execution-memory-limit">Query or import a single execution memory limit<a href="#query-or-import-a-single-execution-memory-limit" class="hash-link" aria-label="Direct link to Query or import a single execution memory limit" title="Direct link to Query or import a single execution memory limit"></a></h2><p>When the following error is returned, it means that the memory limit of a single execution has been exceeded.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">ERROR 1105 (HY000): errCode = 2, detailMessage = Memory limit exceeded:<consuming tracker:<Query#Id=f78208b15e064527-a84c5c0b04c04fcf>, failed alloc size 1.03 MB, exceeded tracker:<Query#Id=f78208b15e064527-a84c5c0b04c04fcf>, limit 100.00 MB, peak used 99.29 MB, current used 99.25 MB>, executing msg:<execute:<ExecNode:VHASH_JOIN_NODE (id=4)>>. backend 172.24.47.117 process memory used 1.13 GB, limit 98.92 GB. If query tracker exceed, `set exec_mem_limit=8G` to change limit, details mem usage see log/be.INFO</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><h3 class="anchor anchorWithStickyNavbar_LWe7" id="error-message-analysis-1">Error message analysis<a href="#error-message-analysis-1" class="hash-link" aria-label="Direct link to Error message analysis" title="Direct link to Error message analysis"></a></h3><p>The error message is divided into three parts:</p><ol><li><code>Memory limit exceeded:<consuming tracker:<Query#Id=f78208b15e064527-a84c5c0b04c04fcf></code>: It is found that the memory limit is exceeded during the memory application process of query <code>f78208b15e064527-a84c5c0b04c04fcf</code>.</li><li><code>failed alloc size 1.03 MB, exceeded tracker:<Query#Id=f78208b15e064527-a84c5c0b04c04fcf>, limit 100.00 MB, peak used 99.29 MB, current used 99.25 MB</code>: The memory requested this time is 1.03 MB The current consumption of <code>f78208b15e064527-a84c5c0b04c04fcf</code> memory tracker is 99.28MB plus 1.03MB, which exceeds the limit of 100MB. The value of limit comes from <code>exec_mem_limit</code> in session variables, and the default is 4G.</li><li><code>executing msg:<execute:<ExecNode:VHASH_JOIN_NODE (id=4)>>. backend 172.24.47.117 process memory used 1.13 GB, limit 98.92 GB. If query tracker exceeds, </code>set exec_mem_limit=8G<code> to change limit, details mem usage see be.INFO.</code>: The location of this memory application is <code>VHASH_JOIN_NODE (id=4)</code>, and it prompts that <code>set exec_mem_limit</code> can be used to increase the memory limit of a single query.</li></ol><h3 class="anchor anchorWithStickyNavbar_LWe7" id="log-analysis-1">Log Analysis<a href="#log-analysis-1" class="hash-link" aria-label="Direct link to Log Analysis" title="Direct link to Log Analysis"></a></h3><p>After <code>set global enable_profile=true</code>, you can print a log in log/be.INFO when a single query memory exceeds the limit, to confirm whether the current query memory usage meets expectations. |
| At the same time, you can find the following logs in log/be.INFO to confirm whether the current query memory usage meets expectations. The logs are also divided into three parts:</p><ol><li><code>Process Memory Summary</code>: process memory statistics.</li><li><code>Alloc Stacktrace</code>: The stack that triggers the memory overrun detection, which is not necessarily the location of the large memory application.</li><li><code>Memory Tracker Summary</code>: The memory tracker statistics of the current query, you can see the memory and peak value currently used by each operator. For details, please refer to <!-- -->[Memory Tracker]<!-- -->(../admin-manual/memory-management/memory -tracker.md). |
| Note: A query will only print the log once after the memory exceeds the limit. At this time, multiple threads of the query will sense it and try to wait for the memory to be released, or cancel the current query. If the value of Try Alloc in the log is small, there is no need to pay attention<code> Alloc Stacktrace</code>, just analyze <code>Memory Tracker Summary</code> directly.</li></ol><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#F8F8F2;--prism-background-color:#282A36"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#F8F8F2"><span class="token plain">W1128 01:34:11.016165 357796 mem_tracker_limiter.cpp:191] Memory limit exceeded:<consuming tracker:<Query#Id=78208b15e064527-a84c5c0b04c04fcf>, failed alloc size 4.00 MB, exceeded tracker:<Query#Id=78208b15e064527-a84c5c0b04c04fcf>, limit 100.00 MB, peak used 98.59 MB,</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">current used 96.88 MB>, executing msg:<execute:<ExecNode:VHASH_JOIN_NODE (id=2)>>. backend 172.24.47.117 process memory used 1.13 GB, limit 98.92 GB. If query tracker exceed, `set exec_mem_limit=8G` to change limit, details mem usage see be.INFO.</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Process Memory Summary: </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> process memory used 1.13 GB limit 98.92 GB, sys mem available 45.15 GB min reserve 3.20 GB, tc/jemalloc allocator cache 27.62 MB</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Alloc Stacktrace: </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x66cf73a doris::vectorized::HashJoinNode::_materialize_build_side()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x69cb1ee doris::vectorized::VJoinNodeBase::open()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x66ce27a doris::vectorized::HashJoinNode::open()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5835dad doris::PlanFragmentExecutor::open_vectorized_internal()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x58351d2 doris::PlanFragmentExecutor::open()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5815244 doris::FragmentExecState::execute()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5817965 doris::FragmentMgr::_exec_actual()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x581fffb std::_Function_handler<>::_M_invoke()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5a6f2c1 doris::ThreadPool::dispatch_thread()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x5a6843f doris::Thread::supervise_thread()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x7f6faa94a1ca start_thread</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ 0x7f6fab121dd3 __GI___clone</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @ (nil) (unknown)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">Memory Tracker Summary:</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTrackerLimiter Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Type=query, Limit=100.00 MB(104857600 B), Used=64.75 MB(67891182 B), Peak=104.70 MB(109786406 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=Scanner#QueryId=78208b15e064527-a84c5c0b04c04fcf, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=RuntimeFilterMgr, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=2.09 KB(2144 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=BufferedBlockMgr2, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=ExecNode:VHASH_JOIN_NODE (id=2), Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=-61.44 MB(-64426656 B), Peak=290.33 KB(297296 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=ExecNode:VEXCHANGE_NODE (id=9), Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=6.12 KB(6264 B), Peak=5.84 KB(5976 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=VDataStreamRecvr:78208b15e064527-a84c5c0b04c04fd2, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=6.12 KB(6264 B), Peak=5.84 KB(5976 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=ExecNode:VEXCHANGE_NODE (id=10), Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=-41.20 MB(-43198024 B), Peak=1.46 MB(1535656 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=VDataStreamRecvr:78208b15e064527-a84c5c0b04c04fd2, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=-41.20 MB(-43198024 B), Peak=1.46 MB(1535656 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=VDataStreamSender:78208b15e064527-a84c5c0b04c04fd2, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=2.34 KB(2400 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=Scanner#QueryId=78208b15e064527-a84c5c0b04c04fcf, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=58.12 MB(60942224 B), Peak=57.41 MB(60202848 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=RuntimeFilterMgr, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=BufferedBlockMgr2, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=ExecNode:VNewOlapScanNode(customer) (id=1), Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=9.55 MB(10013424 B), Peak=10.20 MB(10697136 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=VDataStreamSender:78208b15e064527-a84c5c0b04c04fd1, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=59.80 MB(62701880 B), Peak=59.16 MB(62033048 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=Scanner#QueryId=78208b15e064527-a84c5c0b04c04fcf, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=RuntimeFilterMgr, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=13.62 KB(13952 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=BufferedBlockMgr2, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=0(0 B), Peak=0(0 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=ExecNode:VNewOlapScanNode(lineorder) (id=0), Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=6.03 MB(6318064 B), Peak=4.02 MB(4217664 B)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> MemTracker Label=VDataStreamSender:78208b15e064527-a84c5c0b04c04fd0, Parent Label=Query#Id=78208b15e064527-a84c5c0b04c04fcf, Used=2.34 KB(2400 B), Peak=0(0 B)</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 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fill="currentColor"></path></svg></a><span class="ml-4">On This Page</span><ul class="table-of-contents table-of-contents__left-border"><li><a href="#the-process-memory-exceeds-the-limit-or-the-remaining-available-memory-of-the-system-is-insufficient" class="table-of-contents__link toc-highlight">The process memory exceeds the limit OR the remaining available memory of the system is insufficient</a><ul><li><a href="#error-message-analysis" class="table-of-contents__link toc-highlight">Error message analysis</a></li><li><a href="#log-analysis" class="table-of-contents__link toc-highlight">Log Analysis</a></li><li><a href="#system-remaining-available-memory-calculation" class="table-of-contents__link toc-highlight">System remaining available memory calculation</a></li></ul></li><li><a href="#query-or-import-a-single-execution-memory-limit" class="table-of-contents__link toc-highlight">Query or import a single execution memory limit</a><ul><li><a href="#error-message-analysis-1" class="table-of-contents__link toc-highlight">Error message analysis</a></li><li><a href="#log-analysis-1" class="table-of-contents__link toc-highlight">Log Analysis</a></li></ul></li></ul></div></div></div></div></main></div></div></div><div class="footer pt-16 pb-10"><div class="container"><div class="footer-box"><div class="left"><img src="/images/asf_logo_apache.svg" alt="" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/images/asf_logo_apache.svg" alt="" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">ASF</div><ul class="footer__items clean-list"><li class="footer__item"><a href="https://www.apache.org/" target="_blank" rel="noopener noreferrer" class="footer__link-item">Foundation<svg width="13.5" height="13.5" aria-hidden="true" viewBox="0 0 24 24" class="iconExternalLink_nPIU"><path fill="currentColor" d="M21 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