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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>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-61094] Generating KeyStrings from MultiIndexBlock can result in memory limits not being respected</title>
                <link>https://jira.mongodb.org/browse/SERVER-61094</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When generating &lt;tt&gt;KeyString&lt;/tt&gt; keys we use the &lt;tt&gt;KeyString::PooledBuilder&lt;/tt&gt; that places multiple temporary &lt;tt&gt;KeyString&lt;/tt&gt; on the same larger memory block to avoid multiple small allocations. Each &lt;tt&gt;KeyString&lt;/tt&gt; holds a reference to the underlying memory that will not be free&apos;d until all &lt;tt&gt;KeyString&lt;/tt&gt; that is using it has been free&apos;d.&lt;/p&gt;

&lt;p&gt;Normally this is fine as these &lt;tt&gt;KeyString&lt;/tt&gt; are passed to the sorter that spills do disk when the memory consumption reach a certain threshold. As this process clears all temporary &lt;tt&gt;KeyString&lt;/tt&gt; instances all memory blocks should be free&apos;d.&lt;/p&gt;

&lt;p&gt;However, when there are multiple indexes being built at the same time these pooled memory blocks can be shared between &lt;tt&gt;KeyString&lt;/tt&gt; instances belonging to different indexes. If some indexes generate large keys and need to be flushed to disk often the actual memory will not be free&apos;d if there is still an index building that hasn&apos;t needed to spill to disk.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1912621">SERVER-61094</key>
            <summary>Generating KeyStrings from MultiIndexBlock can result in memory limits not being respected</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Oct 2021 20:27:21 +0000</created>
                <updated>Sun, 29 Oct 2023 21:46:45 +0000</updated>
                            <resolved>Tue, 2 Nov 2021 15:55:29 +0000</resolved>
                                    <version>5.0.0</version>
                                    <fixVersion>5.2.0</fixVersion>
                    <fixVersion>5.0.4</fixVersion>
                    <fixVersion>5.1.0-rc3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="4162162" author="xgen-internal-githook" created="Tue, 2 Nov 2021 00:38:35 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61094&quot; title=&quot;Generating KeyStrings from MultiIndexBlock can result in memory limits not being respected&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61094&quot;&gt;&lt;del&gt;SERVER-61094&lt;/del&gt;&lt;/a&gt; Use a dedicated pooled KeyString builder per index&lt;/p&gt;

&lt;p&gt;This avoids underlying SharedBuffer to be shared for KeyString for&lt;br/&gt;
separate indexes. Allows indexes that need to spill to disk to&lt;br/&gt;
independently free memory instead of being pinned by unrelated other&lt;br/&gt;
indexes.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 5d1078c60e8f24e027dc72d7ceeac4dab49908b9)&lt;br/&gt;
Branch: v5.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/36a5fe52e2b76c6122e906237d8fb3378e4194e6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/36a5fe52e2b76c6122e906237d8fb3378e4194e6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4162161" author="xgen-internal-githook" created="Tue, 2 Nov 2021 00:38:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61094&quot; title=&quot;Generating KeyStrings from MultiIndexBlock can result in memory limits not being respected&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61094&quot;&gt;&lt;del&gt;SERVER-61094&lt;/del&gt;&lt;/a&gt; Use a dedicated pooled KeyString builder per index&lt;/p&gt;

&lt;p&gt;This avoids underlying SharedBuffer to be shared for KeyString for&lt;br/&gt;
separate indexes. Allows indexes that need to spill to disk to&lt;br/&gt;
independently free memory instead of being pinned by unrelated other&lt;br/&gt;
indexes.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 5d1078c60e8f24e027dc72d7ceeac4dab49908b9)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ca88ae9117d06b90dfaf57940484086bd4e0ed82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ca88ae9117d06b90dfaf57940484086bd4e0ed82&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4161856" author="xgen-internal-githook" created="Mon, 1 Nov 2021 21:22:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-61094&quot; title=&quot;Generating KeyStrings from MultiIndexBlock can result in memory limits not being respected&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-61094&quot;&gt;&lt;del&gt;SERVER-61094&lt;/del&gt;&lt;/a&gt; Use a dedicated pooled KeyString builder per index&lt;/p&gt;

&lt;p&gt;This avoids underlying SharedBuffer to be shared for KeyString for&lt;br/&gt;
separate indexes. Allows indexes that need to spill to disk to&lt;br/&gt;
independently free memory instead of being pinned by unrelated other&lt;br/&gt;
indexes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5d1078c60e8f24e027dc72d7ceeac4dab49908b9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5d1078c60e8f24e027dc72d7ceeac4dab49908b9&lt;/a&gt;&lt;/p&gt;</comment>
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