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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-31715] createIndexes (and dropIndexes) may not create index (or leave index around) if migration happens concurrently</title>
                <link>https://jira.mongodb.org/browse/SERVER-31715</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;b&gt;Bug #1:&lt;/b&gt; It&apos;s possible to get ok:1 from createIndexes, but not have the index propagated to all shards if a migration happens in between the recipient and donor shards processing the createIndexes.&lt;/p&gt;

&lt;p&gt;In this case, the raw response for the createIndex from each shard will contain either CannotImplicitlyCreateCollection or ok:1, and the overall createIndexes command will return ok:1.&lt;/p&gt;

&lt;p&gt;Today, to remedy this, createIndexes can be re-run against against the mongos. This second createIndexes will return ok:1, since createIndexes is idempotent.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Bug #2:&lt;/b&gt; It&apos;s possible to get ok:1 from dropIndexes, but have the index get created afterwards on some shard if a migration happens in between the recipient and donor shards processing the dropIndexes.&lt;/p&gt;

&lt;p&gt;In this case, the raw responses for the dropIndex from each shard will contain either NamespaceNotFound or ok:1, and the overall dropIndexes command response will be ok:1.&lt;/p&gt;

&lt;p&gt;Today, to remedy this, dropIndexes can be re-run against the mongos. This second dropIndexes will return ok:0, since dropIndexes is not idempotent, but the index will get dropped from any shards that had the index.&lt;/p&gt;</description>
                <environment></environment>
        <key id="451053">SERVER-31715</key>
            <summary>createIndexes (and dropIndexes) may not create index (or leave index around) if migration happens concurrently</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-sharding">[DO NOT USE] Backlog - Sharding Team</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>gm-ack</label>
                    </labels>
                <created>Wed, 25 Oct 2017 18:26:50 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:49 +0000</updated>
                            <resolved>Sun, 1 Nov 2020 17:13:39 +0000</resolved>
                                    <version>3.6.3</version>
                                                    <component>Sharding</component>
                                        <votes>3</votes>
                                    <watches>22</watches>
                                                                                                                <comments>
                            <comment id="3470758" author="esha.maharishi@10gen.com" created="Sun, 1 Nov 2020 17:13:39 +0000"  >&lt;p&gt;This was fixed in 4.4 by the &quot;Each Shard Has Correct Indexes&quot; project.&lt;/p&gt;</comment>
                            <comment id="2335875" author="dzacchi@amadeus.com" created="Mon, 22 Jul 2019 08:47:23 +0000"  >&lt;p&gt;This issue impacts our Production system and prevents having several mongoS targeted by the application which is a single point of failure.&lt;/p&gt;

&lt;p&gt;We need this fixed as soon as possible, thanks !&lt;/p&gt;</comment>
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