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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-63365] Defragmentation action objects are unnecessarily copied while processed by the Balancer</title>
                <link>https://jira.mongodb.org/browse/SERVER-63365</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The logic implemented by the balancer to retrieve, submit and acknowledge defragmentation commands from the policy involves multiple object copies (&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c99e4833db76bba9842cf9ee9add83aaba0c340a/src/mongo/db/s/balancer/balancer.cpp#L412&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;1&lt;/a&gt;, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c99e4833db76bba9842cf9ee9add83aaba0c340a/src/mongo/db/s/balancer/balancer.cpp#L422&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;2&lt;/a&gt;) that could be replaced with {{std::move()}}s.&lt;/p&gt;

&lt;p&gt;The case of &lt;tt&gt;SplitInfo&lt;/tt&gt; is particularly problematic, as it might involve the copy of a &lt;tt&gt;std::vector&amp;lt;BSONObjs&amp;gt;&lt;/tt&gt; containing thousands of elements.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1978528">SERVER-63365</key>
            <summary>Defragmentation action objects are unnecessarily copied while processed by the Balancer</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="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Mon, 7 Feb 2022 15:46:21 +0000</created>
                <updated>Sun, 29 Oct 2023 21:42:56 +0000</updated>
                            <resolved>Tue, 8 Feb 2022 10:39:58 +0000</resolved>
                                                    <fixVersion>5.3.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4341420" author="xgen-internal-githook" created="Tue, 8 Feb 2022 09:16:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Paolo Polato&apos;, &apos;email&apos;: &apos;paolo.polato@mongodb.com&apos;, &apos;username&apos;: &apos;ppolato&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63365&quot; title=&quot;Defragmentation action objects are unnecessarily copied while processed by the Balancer&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63365&quot;&gt;&lt;del&gt;SERVER-63365&lt;/del&gt;&lt;/a&gt; Reduce number of object copy in balancer secondary thread&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d41c79fa781942f55c55eac302fd472f3169857d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d41c79fa781942f55c55eac302fd472f3169857d&lt;/a&gt;&lt;/p&gt;</comment>
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