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    <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-54701] shardCollection might succesfully write to the config server but end up with missing indexes on the primary Shard</title>
                <link>https://jira.mongodb.org/browse/SERVER-54701</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3eb157099b6a405297bac39168712039751bac8e/src/mongo/db/s/shardsvr_shard_collection.cpp#L329&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;index creation on the shard collection path&lt;/a&gt;&#160;is performed using a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3eb157099b6a405297bac39168712039751bac8e/src/mongo/db/s/shard_key_util.cpp#L227&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;DBClient&lt;/a&gt;, which does not wait for majority write concern. The following scenario might happen:&lt;/p&gt;

&lt;p&gt;1. The shard index is created locally&lt;br/&gt;
2. The writes to config.chunks and config.collections are sent to the config server&lt;br/&gt;
3. A stepdown happens&lt;br/&gt;
4. The index creation is rolled backed&lt;/p&gt;

&lt;p&gt;If the write on step two succeeds then we&apos;ll end up with a sharded collection without the sharded index created on the primary. We should wait for majority write concern of the latest write after the index creation (probably using the same as the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/v4.4/src/mongo/db/s/config/sharding_catalog_manager_database_operations.cpp#L231&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sharding catalog manager&lt;/a&gt;)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1629707">SERVER-54701</key>
            <summary>shardCollection might succesfully write to the config server but end up with missing indexes on the primary Shard</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="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</assignee>
                                    <reporter username="marcos.grillo@mongodb.com">Marcos Jos&#233; Grillo Ramirez</reporter>
                        <labels>
                    </labels>
                <created>Mon, 22 Feb 2021 16:49:22 +0000</created>
                <updated>Sun, 29 Oct 2023 21:57:11 +0000</updated>
                            <resolved>Tue, 23 Mar 2021 13:29:01 +0000</resolved>
                                    <version>4.4.4</version>
                                    <fixVersion>4.4.5</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3678955" author="xgen-internal-githook" created="Tue, 23 Mar 2021 13:22:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ramirez&apos;, &apos;email&apos;: &apos;marcos.grillo@mongodb.com&apos;, &apos;username&apos;: &apos;m4nti5&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54701&quot; title=&quot;shardCollection might succesfully write to the config server but end up with missing indexes on the primary Shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54701&quot;&gt;&lt;del&gt;SERVER-54701&lt;/del&gt;&lt;/a&gt; Wait for majority write concern after shard index creation&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37b8886db6b9e1df473c1b6b90142641b73f87f9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37b8886db6b9e1df473c1b6b90142641b73f87f9&lt;/a&gt;&lt;/p&gt;</comment>
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