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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-49677] RoutingTableHistory::makeUpdated should skip copying chunkMap if it will result in no diffs</title>
                <link>https://jira.mongodb.org/browse/SERVER-49677</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;RoutingTableHistory currently copies the chunkMap unconditionally:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0-rc12/src/mongo/s/chunk_manager.cpp#L600&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.4.0-rc12/src/mongo/s/chunk_manager.cpp#L600&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;And throws it away if it results in no diff:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.4.0-rc12/src/mongo/s/chunk_manager.cpp#L665&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r4.4.0-rc12/src/mongo/s/chunk_manager.cpp#L665&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;In special cases when the size of the changedChunks is 1, we can simply inspect the chunk and compare it to the chunk in the map and skip the copying all together when they are the same. This would save memory and computation in collections with millions of chunks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1412830">SERVER-49677</key>
            <summary>RoutingTableHistory::makeUpdated should skip copying chunkMap if it will result in no diffs</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="allison.easton@mongodb.com">Allison Easton</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Thu, 16 Jul 2020 20:47:07 +0000</created>
                <updated>Sun, 29 Oct 2023 22:05:40 +0000</updated>
                            <resolved>Mon, 10 Aug 2020 13:20:18 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3328758" author="xgen-internal-githook" created="Fri, 7 Aug 2020 21:50:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Allison Easton&apos;, &apos;email&apos;: &apos;allison.easton@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49677&quot; title=&quot;RoutingTableHistory::makeUpdated should skip copying chunkMap if it will result in no diffs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49677&quot;&gt;&lt;del&gt;SERVER-49677&lt;/del&gt;&lt;/a&gt; RoutingTableHistory::makeUpdated should skip copying chunkMap if it will result in no diffs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f0bd888de22307dad1825323cadd3b708f670ae0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f0bd888de22307dad1825323cadd3b708f670ae0&lt;/a&gt;&lt;/p&gt;</comment>
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