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    <description>This file is an XML representation of an issue</description>
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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-80703] Avoid traversing routing table in MigrationDestinationManager</title>
                <link>https://jira.mongodb.org/browse/SERVER-80703</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the migration destination manager, in order to understand if the destination shard already have some chunk, we call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4fad44a858d8ee2d642566fc8872ef410f6534e4/src/mongo/db/s/migration_destination_manager.cpp#L751-L754&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CollectionMetadata::getChunks().empty()&lt;/tt&gt;&lt;/a&gt;. This function scans the entire routing table and make a partial copy of it that contains only chunks belonging to the destination shard.&lt;/p&gt;

&lt;p&gt;When the routing table for the collection has many chunks, this calls can be extremely expensive.&lt;/p&gt;

&lt;p&gt;To avoid this overhead, we could simply use &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4fad44a858d8ee2d642566fc8872ef410f6534e4/src/mongo/db/s/collection_metadata.h#L228&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CollectionMetadata::currentShardHasAnyChunks()&lt;/tt&gt;&lt;/a&gt; instead.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2433338">SERVER-80703</key>
            <summary>Avoid traversing routing table in MigrationDestinationManager</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>balancer-round-perf</label>
                    </labels>
                <created>Mon, 4 Sep 2023 06:30:15 +0000</created>
                <updated>Sun, 29 Oct 2023 21:16:47 +0000</updated>
                            <resolved>Wed, 6 Sep 2023 12:41:29 +0000</resolved>
                                    <version>4.2.24</version>
                    <version>4.4.24</version>
                    <version>5.0.20</version>
                    <version>6.0.9</version>
                                    <fixVersion>4.4.25</fixVersion>
                    <fixVersion>5.0.22</fixVersion>
                    <fixVersion>6.0.11</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5683392" author="xgen-internal-githook" created="Wed, 6 Sep 2023 15:28:24 +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-80703&quot; title=&quot;Avoid traversing routing table in MigrationDestinationManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80703&quot;&gt;&lt;del&gt;SERVER-80703&lt;/del&gt;&lt;/a&gt; Avoid traversing routing table in MigrationDestinationManager&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c1aaaa719d7a96cf21ba3f22f395a444558e10df)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/35be3826cdd7c5c24772b6374c6af0a4a145a7d4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/35be3826cdd7c5c24772b6374c6af0a4a145a7d4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5683093" author="xgen-internal-githook" created="Wed, 6 Sep 2023 13:59:59 +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-80703&quot; title=&quot;Avoid traversing routing table in MigrationDestinationManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80703&quot;&gt;&lt;del&gt;SERVER-80703&lt;/del&gt;&lt;/a&gt; Avoid traversing routing table in MigrationDestinationManager&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c1aaaa719d7a96cf21ba3f22f395a444558e10df)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f3fd24e6cc6b8c39fbf77fe3ef10d4b2f167f047&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f3fd24e6cc6b8c39fbf77fe3ef10d4b2f167f047&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5682779" author="xgen-internal-githook" created="Wed, 6 Sep 2023 12:40:14 +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-80703&quot; title=&quot;Avoid traversing routing table in MigrationDestinationManager&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80703&quot;&gt;&lt;del&gt;SERVER-80703&lt;/del&gt;&lt;/a&gt; Avoid traversing routing table in MigrationDestinationManager&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/df53d277910175336dda5f27f95a0d8f31948997&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/df53d277910175336dda5f27f95a0d8f31948997&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5677295" author="tommaso.tocci" created="Mon, 4 Sep 2023 06:59:04 +0000"  >&lt;p&gt;In versions 7.0+ this &lt;a href=&quot;https://github.com/mongodb/mongo/commit/8a6a2d094b01b10b735972c894bec9d3397ab16e#diff-17025de01700d636abf5e35f5258719abdee149b6239c1cf0aa304a89a3e9ff7L946-R948&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;have been already fixed&lt;/a&gt; by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76779&quot; title=&quot;moveChunk should wait until in-progress index builds are finished on recipient shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76779&quot;&gt;&lt;del&gt;SERVER-76779&lt;/del&gt;&lt;/a&gt;&lt;/p&gt;</comment>
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