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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>[SERVER-60331] External sorter can use more memory than the configured maximum</title>
                <link>https://jira.mongodb.org/browse/SERVER-60331</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The external sorter, when it spills a sorted range, writes out chunks of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2361822068027ab179bf0bbab15c5559612130a6/src/mongo/db/sorter/sorter.cpp#L1124&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;64KB&lt;/a&gt;. When it comes time to merge, it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2361822068027ab179bf0bbab15c5559612130a6/src/mongo/db/sorter/sorter.cpp#L384-L386&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;buffers at least one chunk in memory&lt;/a&gt; from each sorted range.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;maxIndexBuildMemoryUsageMegabytes&lt;/tt&gt; defaults to 200MB. By building many indexes in one createIndexes command, each build is given a fraction of that limit. This causes each index&apos;s sorter to spill more frequently than if each index were built separately.&lt;/p&gt;

&lt;p&gt;Since each spill costs up to 64K in memory during the merge phase, with 1000 spills, that&apos;s about 64MB for one index. If you&apos;re building 10 indexes at once, then you are looking at about 640MB of overhead, which is 3x the default limit.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1886525">SERVER-60331</key>
            <summary>External sorter can use more memory than the configured maximum</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="13201">Fixed</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Wed, 29 Sep 2021 21:10:01 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:01 +0000</updated>
                            <resolved>Wed, 2 Feb 2022 16:37:41 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="4330243" author="xgen-internal-githook" created="Wed, 2 Feb 2022 14:44:04 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-60331&quot; title=&quot;External sorter can use more memory than the configured maximum&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-60331&quot;&gt;&lt;del&gt;SERVER-60331&lt;/del&gt;&lt;/a&gt; Make ExternalSorter respect memory limits&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d6a545506f7842ec6bc369ed7aedcdb8c2d40cd6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d6a545506f7842ec6bc369ed7aedcdb8c2d40cd6&lt;/a&gt;&lt;/p&gt;</comment>
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                            <customfieldvalue>We&amp;#39;ve reworked the external sort so that there will potentially be intermediate merge steps while producing the final iterator. This is to respect memory limits set during the sorting.&lt;br/&gt;
This means there will be two changes:&lt;br/&gt;
&lt;br/&gt;
* The number of spills produced during external sort will change to show how many spills have occurred (the number of spills initially plus all intermediate spills that happen).&lt;br/&gt;
&lt;br/&gt;
* There will now be at most 2 temporary files while sorting, one for the current spills and one containing the merged spills, thus doubling the HDD space usage.</customfieldvalue>

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