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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-82037] Memory used by sorter spills can grow without bound</title>
                <link>https://jira.mongodb.org/browse/SERVER-82037</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A sorter maintains &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afeb1bef3db60f65cc3e265441893b0ea1ab6d1a/src/mongo/db/sorter/sorter.h#L429&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;a vector of &quot;iterators&quot;&lt;/a&gt; for &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afeb1bef3db60f65cc3e265441893b0ea1ab6d1a/src/mongo/db/sorter/sorter.cpp#L876-L882&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;each range of data that it spills to disk&lt;/a&gt;. Each allocation of this &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afeb1bef3db60f65cc3e265441893b0ea1ab6d1a/src/mongo/db/sorter/sorter.cpp#L223-L430&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;FileIterator&lt;/tt&gt;&lt;/a&gt; is 128 bytes, plus the &lt;tt&gt;shared_ptr&lt;/tt&gt;&apos;s control block. Thus with enough spills, the amount of memory being used can easily exceed the value configured by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afeb1bef3db60f65cc3e265441893b0ea1ab6d1a/src/mongo/db/catalog/multi_index_block.idl#L45-L54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;maxIndexBuildMemoryUsageMegabytes&lt;/tt&gt;&lt;/a&gt;. This can also be exacerbated by building multiple indexes in a single index build, since the memory limit will be shared among the indexes and thus each one will spill more often.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2470696">SERVER-82037</key>
            <summary>Memory used by sorter spills can grow without bound</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                    </labels>
                <created>Tue, 10 Oct 2023 14:19:35 +0000</created>
                <updated>Tue, 14 Nov 2023 16:36:08 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5767988" author="JIRAUSER1253424" created="Tue, 10 Oct 2023 15:39:07 +0000"  >&lt;p&gt;Can be worked around by raising the value of &lt;a href=&quot;https://github.com/mongodb/mongo/blob/afeb1bef3db60f65cc3e265441893b0ea1ab6d1a/src/mongo/db/catalog/multi_index_block.idl#L45-L54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;maxIndexBuildMemoryUsageMegabytes&lt;/tt&gt;&lt;/a&gt; when having lots of concurrent indexes being built (in each index build/createIndexes cmd).&lt;/p&gt;</comment>
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            <issuekey id="2093900">SERVER-68125</issuekey>
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            <issuekey id="2497214">SERVER-83145</issuekey>
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