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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-25318] Limit total memory utilization for bulk index builds</title>
                <link>https://jira.mongodb.org/browse/SERVER-25318</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A bulk index build of multiple indexes on a collection, for example using createIndexes, or during an initial sync, will use up to 100 MB of memory per index, or up to 6400 MB of memory total (given the limit of 64 indexes per collection).  This can lead to out-of-memory on smaller machines. We should limit the total memory used on smaller machines by reducing the amount of memory used per index build, and/or limiting the number of simultaneous index builds.&lt;/p&gt;</description>
                <environment></environment>
        <key id="304734">SERVER-25318</key>
            <summary>Limit total memory utilization for bulk index builds</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="9">Done</resolution>
                                        <assignee username="milkie@mongodb.com">Eric Milkie</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Thu, 28 Jul 2016 13:44:45 +0000</created>
                <updated>Thu, 10 May 2018 17:27:13 +0000</updated>
                            <resolved>Mon, 7 Nov 2016 13:46:35 +0000</resolved>
                                                    <fixVersion>3.2.13</fixVersion>
                    <fixVersion>3.4.0-rc3</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>24</watches>
                                                                                                                <comments>
                            <comment id="1490922" author="xgen-internal-githook" created="Thu, 2 Feb 2017 15:46:24 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25318&quot; title=&quot;Limit total memory utilization for bulk index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25318&quot;&gt;&lt;del&gt;SERVER-25318&lt;/del&gt;&lt;/a&gt; limit total memory consumed by bulk simultaneous index builds&lt;/p&gt;

&lt;p&gt;(cherry picked from commit b20282c5fec7cdedc9ba0d1aaf8439bfcd226753)&lt;/p&gt;

&lt;p&gt;Conflicts:&lt;br/&gt;
	src/mongo/db/catalog/index_create.cpp&lt;br/&gt;
	src/mongo/db/index/index_access_method.cpp&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c15f5c7f7b9ccb5a921edb6b66dc790994cb5c65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c15f5c7f7b9ccb5a921edb6b66dc790994cb5c65&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1427794" author="milkie" created="Mon, 7 Nov 2016 13:46:35 +0000"  >&lt;p&gt;New server parameter: maxIndexBuildMemoryUsageMegabytes&lt;br/&gt;
Default value: 500&lt;/p&gt;

&lt;p&gt;Note that this limits the amount of memory that simultaneous foreground index builds for one collection will temporarily consume.  In 3.4, initial sync clones one collection at a time, so no initial sync index build phase should consume more memory than the limit.&lt;br/&gt;
However, if a user initiates foreground index builds for collections in multiple databases at the same time, each databases&apos; index builds will consume up to the memory limit, per database. (It is not possible to build indexes in the foreground on multiple collections within the same database simultaneously.)&lt;/p&gt;</comment>
                            <comment id="1427762" author="xgen-internal-githook" created="Mon, 7 Nov 2016 13:08:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;milkie&apos;, u&apos;name&apos;: u&apos;Eric Milkie&apos;, u&apos;email&apos;: u&apos;milkie@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25318&quot; title=&quot;Limit total memory utilization for bulk index builds&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25318&quot;&gt;&lt;del&gt;SERVER-25318&lt;/del&gt;&lt;/a&gt; limit total memory consumed by bulk simultaneous index builds&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b20282c5fec7cdedc9ba0d1aaf8439bfcd226753&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b20282c5fec7cdedc9ba0d1aaf8439bfcd226753&lt;/a&gt;&lt;/p&gt;</comment>
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