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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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>[DOCS-13213] Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage</title>
                <link>https://jira.mongodb.org/browse/DOCS-13213</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    In this ticket we added a 100MB memory limit on accumulators $push and $addToSet. Before this, these accumulators could use unbounded memory in rare cases. The one we noticed was when everything had been spilled to disk, but upon merging the separate files spilled to disk we accumulated more than 100MB worth of data in the array. These accumulators cannot spill to disk, so pipelines which use more than 100MB will fail.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43944&quot; title=&quot;Accumulators (and possibly expressions) can allocate large amounts of memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43944&quot;&gt;SERVER-43944&lt;/a&gt; describes a more pervasive problem, but it&apos;s probably the case that $push and $addToSet are the worst offenders and not too difficult to fix. Let&apos;s start with those two and leave &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43944&quot; title=&quot;Accumulators (and possibly expressions) can allocate large amounts of memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43944&quot;&gt;SERVER-43944&lt;/a&gt; to track the more general problem which is likely more complex.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="994834">DOCS-13213</key>
            <summary>Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="13201">Fixed</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Sat, 9 Nov 2019 01:39:40 +0000</created>
                <updated>Mon, 13 Nov 2023 18:13:50 +0000</updated>
                            <resolved>Mon, 6 Jan 2020 15:50:44 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                    <fixVersion>4.0.14</fixVersion>
                    <fixVersion>3.6.17</fixVersion>
                    <fixVersion>4.2.3</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2867606" author="xgen-internal-githook" created="Tue, 11 Feb 2020 22:40:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;kay-kim&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8e388cd91e8505dcc630da46a542af222c0a0c15&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8e388cd91e8505dcc630da46a542af222c0a0c15&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2767080" author="xgen-internal-githook" created="Tue, 28 Jan 2020 00:38:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/45c0a24adeff64784a51ebe0b5d1bf2c4c963362&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/45c0a24adeff64784a51ebe0b5d1bf2c4c963362&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2767077" author="xgen-internal-githook" created="Tue, 28 Jan 2020 00:37:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;, &apos;name&apos;: &apos;Kay Kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v3.6.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/aad61be1f8ba36a1538b42399206f9dcd4d0b9a0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/aad61be1f8ba36a1538b42399206f9dcd4d0b9a0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2767009" author="xgen-internal-githook" created="Mon, 27 Jan 2020 23:57:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;kay-kim&apos;, &apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/8e388cd91e8505dcc630da46a542af222c0a0c15&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/8e388cd91e8505dcc630da46a542af222c0a0c15&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2705283" author="xgen-internal-githook" created="Mon, 6 Jan 2020 15:47:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v3.6.17&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/431ce75a68f3cc37a699ed0747f0f47c69402b42&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/431ce75a68f3cc37a699ed0747f0f47c69402b42&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2705234" author="xgen-internal-githook" created="Mon, 6 Jan 2020 15:31:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/0cc7ecabde44bfcdaa7f08c9a3d8e04df8a49199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/0cc7ecabde44bfcdaa7f08c9a3d8e04df8a49199&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2705194" author="xgen-internal-githook" created="Mon, 6 Jan 2020 15:21:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kay Kim&apos;, &apos;email&apos;: &apos;kay.kim@10gen.com&apos;, &apos;username&apos;: &apos;kay-kim&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-13213&quot; title=&quot;Investigate changes in SERVER-44174: $push and $addToSet should restrict memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-13213&quot;&gt;&lt;del&gt;DOCS-13213&lt;/del&gt;&lt;/a&gt;: push and addToSet mem limit&lt;br/&gt;
Branch: v4.2.3&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/f48ad390f5586f88d47152919d50035d5ace69e9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/f48ad390f5586f88d47152919d50035d5ace69e9&lt;/a&gt;&lt;/p&gt;</comment>
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