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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-3373] Chunk migrations can build indexes</title>
                <link>https://jira.mongodb.org/browse/DOCS-3373</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The first step in our migration logic is to build all missing indexes on the TO shard (compared to the FROM shard): &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r2.6.1/src/mongo/s/d_migrate.cpp#L1662&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r2.6.1/src/mongo/s/d_migrate.cpp#L1662&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This feature allows our users to add new shards and they don&apos;t have to worry about building indexes there manually. It&apos;s important to note that the index builds are propagated to secondaries.&lt;/p&gt;

&lt;p&gt;We should specifically document this feature, otherwise the implications can be unexpected and.. surprising &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</description>
                <environment>&lt;a href=&quot;https://github.com/mongodb/docs/edit/master/source/core/sharding-balancing.txt&quot;&gt;https://github.com/mongodb/docs/edit/master/source/core/sharding-balancing.txt&lt;/a&gt;</environment>
        <key id="135600">DOCS-3373</key>
            <summary>Chunk migrations can build indexes</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="andrew.aldridge@mongodb.com">Andrew Aldridge</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 May 2014 20:44:44 +0000</created>
                <updated>Mon, 16 Mar 2015 23:56:37 +0000</updated>
                            <resolved>Tue, 23 Sep 2014 19:51:05 +0000</resolved>
                                                    <fixVersion>v1.3.11</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="725432" author="xgen-internal-githook" created="Tue, 23 Sep 2014 19:50:56 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;i80and&apos;, u&apos;name&apos;: u&apos;Andrew Aldridge&apos;, u&apos;email&apos;: u&apos;i80and@foxquill.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3373&quot; title=&quot;Chunk migrations can build indexes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3373&quot;&gt;&lt;del&gt;DOCS-3373&lt;/del&gt;&lt;/a&gt;: Chunk migration builds indexes&lt;/p&gt;

&lt;p&gt;Signed-off-by: Sam Kleinman &amp;lt;samk@10gen.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/69c38732d5992df72b8c3fd38384315287ab5101&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/69c38732d5992df72b8c3fd38384315287ab5101&lt;/a&gt;&lt;/p&gt;</comment>
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