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    <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-44964] [4.2] Calculate index build memory usage per key based on BSONObj buffer capacity, not size</title>
                <link>https://jira.mongodb.org/browse/SERVER-44964</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Index builds limit their memory usage with the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4817113e29f13af7a658a1a76ff6b962d8da1836/src/mongo/db/catalog/multi_index_block.idl#L54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;parameter maxIndexBuildMemoryUsageMegabytes&lt;/a&gt;, which defaults to 500MB. The memory usage calculation depends on the BSONObj accurately reporting its memory usuage in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a0bbbff6ada159e19298d37946ac8dc4b497eadf/src/mongo/bson/bsonobj.h#L576&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;memUsageForSorter()&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;BSONObj reports its memory usage as the size of the object, but not the capacity of the buffer holding that object. This is problematic because index builds can use significantly more memory than they they should.&lt;/p&gt;

&lt;p&gt;We should change the imlementation of memUsageForSorter() to report the size of the underlying SharedBuffer, in a very similar way to&#160; what we did for in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42931&quot; title=&quot;KeyString::Value should report its memory usage as the total buffer capacity&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42931&quot;&gt;&lt;del&gt;SERVER-42931&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1038558">SERVER-44964</key>
            <summary>[4.2] Calculate index build memory usage per key based on BSONObj buffer capacity, not size</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="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                    </labels>
                <created>Thu, 5 Dec 2019 17:47:06 +0000</created>
                <updated>Sun, 29 Oct 2023 22:14:24 +0000</updated>
                            <resolved>Wed, 25 Dec 2019 13:11:42 +0000</resolved>
                                    <version>3.6.0</version>
                    <version>4.0.0</version>
                    <version>4.2.0</version>
                                    <fixVersion>4.2.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2662274" author="xgen-internal-githook" created="Mon, 23 Dec 2019 22:59:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Eric Milkie&apos;, &apos;email&apos;: &apos;milkie@mongodb.com&apos;, &apos;username&apos;: &apos;milkie&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-44964&quot; title=&quot;[4.2] Calculate index build memory usage per key based on BSONObj buffer capacity, not size&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-44964&quot;&gt;&lt;del&gt;SERVER-44964&lt;/del&gt;&lt;/a&gt; calculate index build memory usage per key based on BSONObj buffer capacity instead of object size&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/38e05a18e716da5020d8f01f37e8bd8cf8f769b1&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/38e05a18e716da5020d8f01f37e8bd8cf8f769b1&lt;/a&gt;&lt;/p&gt;</comment>
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