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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-54874] Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache</title>
                <link>https://jira.mongodb.org/browse/SERVER-54874</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, when the ConfigServerCatalogCache refreshes, it first issues a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/8cfccd21f2f06bf93345ad25b3ca0a9af489b0e2/src/mongo/s/config_server_catalog_cache_loader.cpp#L93&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;majority read on config.collections&lt;/a&gt; and after that it issues a second &lt;a href=&quot;#L133-L140].&quot; target=&quot;_blank&quot; rel=&quot;noopener&quot;&gt;majority read on config.chunks&lt;/a&gt;&#160;Because of this, the collection metadata we read from config.collections may not be consistent with the chunks (and thus collection version) we read from config.chunks.&lt;/p&gt;

&lt;p&gt;To address this we need to ensure that we read config.collections and config.chunks &apos;as a package&apos;. To do so, we can use an aggregation pipeline on config.collections that has a $lookUp stage from config.chunks, and attach a snapshot read concern.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1636832">SERVER-54874</key>
            <summary>Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>PM-234-Catalog-Work</label>
                            <label>sharding-csrs-stepdown-also</label>
                    </labels>
                <created>Tue, 2 Mar 2021 08:15:05 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:52 +0000</updated>
                            <resolved>Mon, 15 Mar 2021 17:04:12 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3663956" author="xgen-internal-githook" created="Mon, 15 Mar 2021 12:11:26 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54874&quot; title=&quot;Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54874&quot;&gt;&lt;del&gt;SERVER-54874&lt;/del&gt;&lt;/a&gt;: Ensure reading consistent config.collections and config.chunks when refreshing the CatalogCache&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 538cb2ff982aab2a60c4f3ab53eb1ba6d1acfeb9)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d22d0058c4f02c7bcd7337af8b1058cac8e26e45&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d22d0058c4f02c7bcd7337af8b1058cac8e26e45&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3654898" author="xgen-internal-githook" created="Tue, 9 Mar 2021 17:00:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54874&quot; title=&quot;Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54874&quot;&gt;&lt;del&gt;SERVER-54874&lt;/del&gt;&lt;/a&gt;: Ensure reading consistent config.collections and config.chunks when refreshing the CatalogCache&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit dc009c5a8d484f6a0db2f357274e14e30ea9f476.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e85a000b214e73783b406dadfb229cde21f3e8c5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e85a000b214e73783b406dadfb229cde21f3e8c5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3652444" author="xgen-internal-githook" created="Mon, 8 Mar 2021 17:21:36 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54874&quot; title=&quot;Ensure reading of consistent config.collections and config.chunks when refreshing the CatalogCache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54874&quot;&gt;&lt;del&gt;SERVER-54874&lt;/del&gt;&lt;/a&gt;: Ensure reading consistent config.collections and config.chunks when refreshing the CatalogCache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dc009c5a8d484f6a0db2f357274e14e30ea9f476&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dc009c5a8d484f6a0db2f357274e14e30ea9f476&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="1578456">SERVER-53539</issuekey>
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            <issuekey id="1683660">SERVER-56190</issuekey>
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            <issuelink>
            <issuekey id="1867938">SERVER-59803</issuekey>
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