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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-54015] Race condition in the `shardCollectionLegacy` logic due to usage of CatalogCache instead of CSS</title>
                <link>https://jira.mongodb.org/browse/SERVER-54015</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When the legacy shardCollection logic runs, it does an optimistic &lt;a href=&quot;https://github.com/mongodb/mongo/blob/27be7cc893de5b06aea8b8f7551ebf8dd6815921/src/mongo/db/s/shard_collection_legacy.cpp#L538&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;check of whether the collection is already sharded&lt;/a&gt; with the same options using direct reads from the config server. However, later on it &lt;a href=&quot;https://github.com/mongodb/mongo/blob/27be7cc893de5b06aea8b8f7551ebf8dd6815921/src/mongo/db/s/shard_collection_legacy.cpp#L542&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;uses the CatalogCache&lt;/a&gt; in order to return information about the collection.&lt;/p&gt;

&lt;p&gt;If the collection was sharded from another node, the CatalogCache is not guaranteed to be up to date and it is possible that it returns that a collection is unsharded (even though it is sharded on the config server).&lt;/p&gt;

&lt;p&gt;Because of this, the check needs to be done using the CSS instead of direct reads.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1599147">SERVER-54015</key>
            <summary>Race condition in the `shardCollectionLegacy` logic due to usage of CatalogCache instead of CSS</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-1965-Cleanup</label>
                            <label>Sharding-EMEA</label>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Mon, 25 Jan 2021 08:34:24 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:26 +0000</updated>
                            <resolved>Fri, 29 Jan 2021 14:56:44 +0000</resolved>
                                    <version>4.9.0-alpha2</version>
                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3589360" author="xgen-internal-githook" created="Fri, 29 Jan 2021 13:46:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Marcos Jos&#233; Grillo Ram&#237;rez&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-54015&quot; title=&quot;Race condition in the `shardCollectionLegacy` logic due to usage of CatalogCache instead of CSS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54015&quot;&gt;&lt;del&gt;SERVER-54015&lt;/del&gt;&lt;/a&gt; Use catalog cache with a refresh to check if a collection was already created when sharding&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cc088fe029f2da2deb439c4808a6a6eb280c5adf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cc088fe029f2da2deb439c4808a6a6eb280c5adf&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3579748" author="kaloian.manassiev" created="Mon, 25 Jan 2021 08:36:05 +0000"  >&lt;p&gt;I believe this came from &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52616&quot; title=&quot;Create the _shardsvrCreateCollection command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52616&quot;&gt;&lt;del&gt;SERVER-52616&lt;/del&gt;&lt;/a&gt;, so assigning it to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=marcos.grillo&quot; class=&quot;user-hover&quot; rel=&quot;marcos.grillo&quot;&gt;marcos.grillo&lt;/a&gt;.&lt;/p&gt;</comment>
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