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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-26507] BSONObj::memUsageForSorter() should use buffer size instead of object size</title>
                <link>https://jira.mongodb.org/browse/SERVER-26507</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The sorter&apos;s memory requirements depend on the buffer size of the index keys, but BSONObj::memUsageForSorter() uses the object size of the index keys. This requires the developer to ensure that the object size match the buffer size for index keys, or else the sorter&apos;s memory usage estimates will be off, and it can run out of memory. This leads to bugs like &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25075&quot; title=&quot;Building 2dsphere index uses excessive memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25075&quot;&gt;&lt;del&gt;SERVER-25075&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26488&quot; title=&quot;Bulk build of _id index uses excessive memory&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26488&quot;&gt;&lt;del&gt;SERVER-26488&lt;/del&gt;&lt;/a&gt;. It is still useful to optimize the buffer size for index keys for efficiency, but it would be better if forgetting to do so did not cause OOM failures.&lt;/p&gt;

&lt;p&gt;We would have to consider the performance implications of storing the buffer size of a BSONObj.&lt;/p&gt;</description>
                <environment></environment>
        <key id="321678">SERVER-26507</key>
            <summary>BSONObj::memUsageForSorter() should use buffer size instead of object size</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
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                <created>Thu, 6 Oct 2016 18:13:34 +0000</created>
                <updated>Tue, 6 Dec 2022 04:14:52 +0000</updated>
                                                            <fixVersion>features we&amp;#39;re not sure of</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1402251" author="bruce.lucas@10gen.com" created="Thu, 6 Oct 2016 18:22:05 +0000"  >&lt;blockquote&gt;
&lt;p&gt;it would be better if forgetting to do so did not cause OOM failures&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Agreed, but it would also be good if forgetting to do so left some visible trace other than (presumably) reduced performance due to using a smaller total sort size due to the wasted space. I don&apos;t however have atm a good idea how that might be done.&lt;/p&gt;</comment>
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