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    <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-48566] Shard loader in primary nodes blindly read the version of config.cache.collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-48566</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When the catalog cache loader does a refresh from scratch, it first checks the maximum version that it has from config.cache.collections. This version will be used in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eab3da634bc745c25c7dd38c07e4911e81020e04/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L751&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;query to get the chunk diffs&lt;/a&gt;. It will then combine the result from the diff and config.cache.chunks to form the complete collection metadata. The issue, however, is that the writes in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/eab3da634bc745c25c7dd38c07e4911e81020e04/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L126&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;config.cache.collections&lt;/a&gt; and config.cache.chunks are not atomic. This means that it is possible for the version to be higher than what is contained in the config.cache.chunks. This can make the loader falsely believe that it is a certain version, but the contents of the chunk map does not agree with it.&lt;/p&gt;

&lt;p&gt;One example manifestation is that when a shard key refine happens, then the primary stepped down after it modified the config.cache.collections but before it was able to modify the config.cache.chunks (or was rolled back), the new primary will not be able to find the matching exact bounds when trying to migrate because the in memory metadata will still contain the older shard keys despite having the version of post refine.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1370627">SERVER-48566</key>
            <summary>Shard loader in primary nodes blindly read the version of config.cache.collections</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="randolph@mongodb.com">Randolph Tan</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Wed, 3 Jun 2020 14:57:33 +0000</created>
                <updated>Sun, 29 Oct 2023 22:07:29 +0000</updated>
                            <resolved>Mon, 29 Jun 2020 14:51:26 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3383748" author="xgen-internal-githook" created="Wed, 9 Sep 2020 18:35:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48566&quot; title=&quot;Shard loader in primary nodes blindly read the version of config.cache.collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48566&quot;&gt;&lt;del&gt;SERVER-48566&lt;/del&gt;&lt;/a&gt; Shard loader in primary nodes blindly read the version of config.cache.collections&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 3c9e077b966150d21c3459eeecf4765bee59b2d8)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/590341c7785a78ba6e824564d971cc72ae880d65&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/590341c7785a78ba6e824564d971cc72ae880d65&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3228123" author="xgen-internal-githook" created="Mon, 29 Jun 2020 14:40:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Randolph Tan&apos;, &apos;email&apos;: &apos;randolph@10gen.com&apos;, &apos;username&apos;: &apos;renctan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48566&quot; title=&quot;Shard loader in primary nodes blindly read the version of config.cache.collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48566&quot;&gt;&lt;del&gt;SERVER-48566&lt;/del&gt;&lt;/a&gt; Shard loader in primary nodes blindly read the version of config.cache.collections&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3c9e077b966150d21c3459eeecf4765bee59b2d8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3c9e077b966150d21c3459eeecf4765bee59b2d8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3188149" author="renctan" created="Wed, 3 Jun 2020 17:48:42 +0000"  >&lt;p&gt;Attached test.js that demonstrates this bug.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="973141">SERVER-44105</issuekey>
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                            <attachment id="265798" name="test.js" size="1674" author="randolph@mongodb.com" created="Thu, 11 Jun 2020 20:25:10 +0000"/>
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