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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-81155] Use move semantic to avoid copying all chunks in createCollection coordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-81155</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the createCollection coordinator we accidentally &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2fed04292b5e5794eb71f1af9953922d14643535/src/mongo/db/s/create_collection_coordinator.cpp#L413&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;copy all chunks&lt;/a&gt; after we serialize them. To avoid this copy we could simply use move semantic.&lt;/p&gt;

&lt;p&gt;While in versions 6.0+ this is not particularly problematic because we usually do not have a huge number of chunks, in previous versions (&amp;lt;= 5.0) &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2fed04292b5e5794eb71f1af9953922d14643535/src/mongo/db/s/create_collection_coordinator.cpp#L644-L660&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the number of chunks could be very high, on the order of millions.&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2445040">SERVER-81155</key>
            <summary>Use move semantic to avoid copying all chunks in createCollection coordinator</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="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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>car-71-backport-declined</label>
                    </labels>
                <created>Mon, 18 Sep 2023 17:12:08 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:15 +0000</updated>
                            <resolved>Wed, 20 Sep 2023 16:11:56 +0000</resolved>
                                    <version>4.2.24</version>
                    <version>7.0.1</version>
                    <version>4.4.24</version>
                    <version>6.0.10</version>
                    <version>5.0.21</version>
                    <version>7.1.0-rc3</version>
                                    <fixVersion>7.2.0-rc0</fixVersion>
                    <fixVersion>5.0.22</fixVersion>
                    <fixVersion>6.0.11</fixVersion>
                    <fixVersion>7.0.3</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5720705" author="xgen-internal-githook" created="Thu, 21 Sep 2023 11:48:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81155&quot; title=&quot;Use move semantic to avoid copying all chunks in createCollection coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81155&quot;&gt;&lt;del&gt;SERVER-81155&lt;/del&gt;&lt;/a&gt; Use move semantic to avoid copying all chunks in createCollection coordinator&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8f87c384b359af4e684e6a0d41e2e42aeee51c93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8f87c384b359af4e684e6a0d41e2e42aeee51c93&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5720703" author="xgen-internal-githook" created="Thu, 21 Sep 2023 11:48:10 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81155&quot; title=&quot;Use move semantic to avoid copying all chunks in createCollection coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81155&quot;&gt;&lt;del&gt;SERVER-81155&lt;/del&gt;&lt;/a&gt; Use move semantic to avoid copying all chunks in createCollection coordinator&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9a461b6cf632ad26822df320d7cfcf8e516251bd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9a461b6cf632ad26822df320d7cfcf8e516251bd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5720683" author="xgen-internal-githook" created="Thu, 21 Sep 2023 11:38:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81155&quot; title=&quot;Use move semantic to avoid copying all chunks in createCollection coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81155&quot;&gt;&lt;del&gt;SERVER-81155&lt;/del&gt;&lt;/a&gt; Use move semantic to avoid copying all chunks in createCollection coordinator&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/567ad8af7677e908f352b7c17f193c17c6a86ecf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/567ad8af7677e908f352b7c17f193c17c6a86ecf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5718416" author="xgen-internal-githook" created="Wed, 20 Sep 2023 15:55:52 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81155&quot; title=&quot;Use move semantic to avoid copying all chunks in createCollection coordinator&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81155&quot;&gt;&lt;del&gt;SERVER-81155&lt;/del&gt;&lt;/a&gt; Use move semantic to avoid copying all chunks in createCollection coordinator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e36a45d31a6d5f2c1edcd1a4f009a86bd209210&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e36a45d31a6d5f2c1edcd1a4f009a86bd209210&lt;/a&gt;&lt;/p&gt;</comment>
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