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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-12472] Fail MoveChunk if an index is needed on TO shard and data exists</title>
                <link>https://jira.mongodb.org/browse/SERVER-12472</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During a moveChunk we ensure all indexes from the source shard. This makes sense if the collection is new or already has all the indexes (since it is a no-op) but in the case of different indexes a movechunk can degrade performance and block other operations because of the &quot;new&quot; indexes.&lt;/p&gt;

&lt;p&gt;It is therefore an improvement to make the operation fail because of the missing index(es) rather than add load and affect performance and availability of the destination shard.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v2.4/src/mongo/s/d_migrate.cpp#L1660&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/v2.4/src/mongo/s/d_migrate.cpp#L1660&lt;/a&gt; for the 2.4.x (currently the same in 2.5.x) behavior.&lt;/p&gt;</description>
                <environment></environment>
        <key id="107554">SERVER-12472</key>
            <summary>Fail MoveChunk if an index is needed on TO shard and data exists</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="9">Done</resolution>
                                        <assignee username="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="scotthernandez">Scott Hernandez</reporter>
                        <labels>
                            <label>moveChunk</label>
                    </labels>
                <created>Fri, 24 Jan 2014 18:59:39 +0000</created>
                <updated>Tue, 27 Oct 2015 14:48:52 +0000</updated>
                            <resolved>Fri, 15 Aug 2014 19:38:00 +0000</resolved>
                                                    <fixVersion>2.6.6</fixVersion>
                    <fixVersion>2.7.6</fixVersion>
                                    <component>Index Maintenance</component>
                    <component>Sharding</component>
                                        <votes>6</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="771825" author="xgen-internal-githook" created="Mon, 24 Nov 2014 23:01:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12472&quot; title=&quot;Fail MoveChunk if an index is needed on TO shard and data exists&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12472&quot;&gt;&lt;del&gt;SERVER-12472&lt;/del&gt;&lt;/a&gt; Fail MoveChunk if an index is needed on TO shard and data exists&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0f7dbe98cd6a4f15eb7a112fbae62383fb3805c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0f7dbe98cd6a4f15eb7a112fbae62383fb3805c6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="692119" author="xgen-internal-githook" created="Fri, 15 Aug 2014 19:29:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;renctan&apos;, u&apos;name&apos;: u&apos;Randolph Tan&apos;, u&apos;email&apos;: u&apos;randolph@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12472&quot; title=&quot;Fail MoveChunk if an index is needed on TO shard and data exists&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12472&quot;&gt;&lt;del&gt;SERVER-12472&lt;/del&gt;&lt;/a&gt; Fail MoveChunk if an index is needed on TO shard and data exists&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/39d5795eab4da921e2c813b3c99ae52a0d913f6b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/39d5795eab4da921e2c813b3c99ae52a0d913f6b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="488460" author="david.hows" created="Mon, 27 Jan 2014 22:29:56 +0000"  >&lt;p&gt;May be worth adding some kind of health check command in the shell (maybe &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-8752&quot; title=&quot;Improve visibility of Balancer operation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-8752&quot;&gt;&lt;del&gt;SERVER-8752&lt;/del&gt;&lt;/a&gt;) so that admins can be aware that migrations have failed due to missing indexes and know what those indexes are.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="171192">SERVER-16316</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="168427">DOCS-4316</issuekey>
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