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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-29787] MongoDB allocate and free too much memory</title>
                <link>https://jira.mongodb.org/browse/SERVER-29787</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When few queries process many documents (for example, full collection scan),&lt;br/&gt;
MongoDB allocate and deallocate too much memory. So after few full scan query, free memory of linux is decreased and eventually linux use swap space.&lt;/p&gt;

&lt;p&gt;Take a look at the attached graph.&lt;/p&gt;

&lt;p&gt;And this case happen very often. I think you can reproduce this case easily.&lt;/p&gt;</description>
                <environment></environment>
        <key id="396869">SERVER-29787</key>
            <summary>MongoDB allocate and free too much memory</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="5">Cannot Reproduce</resolution>
                                        <assignee username="mark.agarunov">Mark Agarunov</assignee>
                                    <reporter username="sunguck.lee@gmail.com">&#50500;&#45208; &#54616;&#47532;</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Jun 2017 06:05:13 +0000</created>
                <updated>Wed, 8 Feb 2023 15:40:58 +0000</updated>
                            <resolved>Wed, 5 Jul 2017 15:14:28 +0000</resolved>
                                    <version>3.4.4</version>
                                                                        <votes>0</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1614140" author="mark.agarunov" created="Wed, 5 Jul 2017 15:14:18 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.lee&quot; class=&quot;user-hover&quot; rel=&quot;matt.lee&quot;&gt;matt.lee&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the response. As this issue cannot currently be reproduced, I&apos;ve closed this ticket. If this is an issue for you in the future, please let us know and we will reopen the ticket.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                            <comment id="1611237" author="sunguck.lee@gmail.com" created="Fri, 30 Jun 2017 08:50:20 +0000"  >&lt;p&gt;Hi Mark.&lt;/p&gt;

&lt;p&gt;I have seen this case in quite a while, so diagnostics data is gone.&lt;br/&gt;
So I have tried to reproduce it but I can&apos;t. I will get back again with diagnostics data when I see similar case.&lt;/p&gt;

&lt;p&gt;Thanks.&lt;/p&gt;</comment>
                            <comment id="1604320" author="mark.agarunov" created="Thu, 22 Jun 2017 15:34:20 +0000"  >&lt;p&gt;Hello &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.lee&quot; class=&quot;user-hover&quot; rel=&quot;matt.lee&quot;&gt;matt.lee&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for the report. To better understand what may be causing the memory usage, could you please archive and upload the &lt;tt&gt;$dbPath/diagnostic.data&lt;/tt&gt; directory and attach it to this ticket? This should give us a better idea of what may be using the memory.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Mark&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="159270" name="FreeMemoryStatus.png" size="21568" author="matt.lee" created="Thu, 22 Jun 2017 05:57:33 +0000"/>
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