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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-22116] Memory limit of MigrationSourceManager is too big</title>
                <link>https://jira.mongodb.org/browse/SERVER-22116</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MigrationSourceManger is caching the document id of modification during moving chunk. &lt;/p&gt;

&lt;p&gt;But I think the threshold of memory usage is too big. &lt;br/&gt;
According to the source code, current limit is 5TB. Move chunk command is checking whether the memory usage is greater than 500*1024*1024, but MigrationSourceManager::mbUsed() already return MB not Bytes. So eventually MoveChunkCommand will be aborted when memory usage is greater than 5TB.&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/move_chunk_command.cpp#L397&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/move_chunk_command.cpp#L397&lt;/a&gt;&lt;br/&gt;
            if (shardingState-&amp;gt;migrationSourceManager()-&amp;gt;mbUsed() &amp;gt; (500 * 1024 * 1024)) {&lt;br/&gt;
                // This is too much memory for us to use so we&apos;re going to abort the migration&lt;br/&gt;
                ...&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/migration_source_manager.cpp#L557&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/s/migration_source_manager.cpp#L557&lt;/a&gt;&lt;br/&gt;
long long MigrationSourceManager::mbUsed() const &lt;/p&gt;
{
    stdx::lock_guard&amp;lt;stdx::mutex&amp;gt; lk(_mutex);
    return _memoryUsed / (1024 * 1024);
}</description>
                <environment></environment>
        <key id="246482">SERVER-22116</key>
            <summary>Memory limit of MigrationSourceManager is too big</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="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="sunguck.lee@gmail.com">&#50500;&#45208; &#54616;&#47532;</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Jan 2016 08:24:55 +0000</created>
                <updated>Wed, 8 Feb 2023 15:39:07 +0000</updated>
                            <resolved>Mon, 9 Dec 2019 15:49:45 +0000</resolved>
                                    <version>3.0.8</version>
                    <version>3.2.0</version>
                                    <fixVersion>3.4.23</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1130945" author="ramon.fernandez" created="Mon, 11 Jan 2016 13:55:41 +0000"  >&lt;p&gt;Thanks for your report &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=matt.lee&quot; class=&quot;user-hover&quot; rel=&quot;matt.lee&quot;&gt;matt.lee&lt;/a&gt;, sending it to the Sharding team for evaluation.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="265890">SERVER-22656</issuekey>
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