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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-72322] The &apos;forceShardFilteringMetadataRefresh&apos; methods don&apos;t synchronise with each other (4.4 and 4.2 only)</title>
                <link>https://jira.mongodb.org/browse/SERVER-72322</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket is a specialization of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-64730&quot; title=&quot;The &amp;#39;forceShardFilteringMetadataRefresh&amp;#39; methods don&amp;#39;t synchronise with each other (5.0 and newer versions)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-64730&quot;&gt;&lt;del&gt;SERVER-64730&lt;/del&gt;&lt;/a&gt;, to track this issue on 4.4 and 4.2 branches.&lt;/p&gt;

&lt;p&gt;The&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/e9c70c962b4fce236da2c85cdfa38635a436cc3d/src/mongo/db/s/shard_filtering_metadata_refresh.h#L81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;forceShardFilteringMetadataRefresh&lt;/tt&gt;&lt;/a&gt;&#160;method is the lowest-level shard version causality utility on the shards, whose purpose is to always move the shard version forward.&lt;/p&gt;

&lt;p&gt;In versions 4.0 and earlier, it used to&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.28/src/mongo/db/s/shard_filtering_metadata_refresh.cpp#L174&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;acquire collection X lock and check that the newly installed version is actually newer than the one on the CSS&lt;/a&gt;&#160;before installing it. Starting from version 4.2 though, as part of the transaction project&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0d07bf5e7a72a5bce3f7d7d681a71d7ecfe7eb8c#diff-19122889349748518415f5a3a503a7028e13b10f1cf41db437806cbc4c471a80L184&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it was changed&lt;/a&gt;&#160;to not acquire collection X-lock.&lt;/p&gt;

&lt;p&gt;This means that two concurrent invocations of&#160;&lt;tt&gt;forceShardFilteringMetadataRefresh&lt;/tt&gt;&#160;could potentially race with each other and install non-monotonous increasing versions (i.e., the shard version on a shard can go back in time).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2216956">SERVER-72322</key>
            <summary>The &apos;forceShardFilteringMetadataRefresh&apos; methods don&apos;t synchronise with each other (4.4 and 4.2 only)</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="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                            <label>shardingemea-qw</label>
                    </labels>
                <created>Wed, 21 Dec 2022 16:58:18 +0000</created>
                <updated>Tue, 6 Feb 2024 14:00:30 +0000</updated>
                                            <version>4.2.0</version>
                    <version>4.4.0</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
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                    <name>Problem/Incident</name>
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            <issuekey id="720542">SERVER-40258</issuekey>
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            <issuekey id="897861">SERVER-42838</issuekey>
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