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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-47985] Implement recovery of a shard&apos;s `shardVersion` before it is allowed to perform version checking</title>
                <link>https://jira.mongodb.org/browse/SERVER-47985</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The sharding migration commit protocol does not perform a proper 2-phase commit in order to have the minimum possible latency impact in the steady state. Because of this, the following theoretical sequence of events is possible:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The current primary of a shard is just about to commit migration against the config server&lt;/li&gt;
	&lt;li&gt;A new primary is elected, which refreshes from the config server before the commit from the previous primary has reached it&lt;/li&gt;
	&lt;li&gt;The new primary sees old shardVersion (and as a result also filtering metadata) and incorrectly accepts writes which are supposed to go to a different shard&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The RangeDeleter project implemented a command to bump a chunk&apos;s shard version and also added a check for chunk version equality as part of the migration commit. We should package that logic into an asynchronous task and make sure that forceFilteringMetadataRefresh executes that recovery logic before accepting the shardVersion returned from the config server.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1341956">SERVER-47985</key>
            <summary>Implement recovery of a shard&apos;s `shardVersion` before it is allowed to perform version checking</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="tommaso.tocci@mongodb.com">Tommaso Tocci</reporter>
                        <labels>
                            <label>PM-1645-Milestone-1</label>
                    </labels>
                <created>Wed, 6 May 2020 15:01:40 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:36 +0000</updated>
                            <resolved>Wed, 3 Jun 2020 17:32:23 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3187120" author="xgen-internal-githook" created="Wed, 3 Jun 2020 14:13:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47985&quot; title=&quot;Implement recovery of a shard&amp;#39;s `shardVersion` before it is allowed to perform version checking&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47985&quot;&gt;&lt;del&gt;SERVER-47985&lt;/del&gt;&lt;/a&gt; Implement recovery of a shard&apos;s `shardVersion` before it is allowed to perform version checking&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f7c2b0c472b9c0ed9e12301cc5951ecf9f886722&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f7c2b0c472b9c0ed9e12301cc5951ecf9f886722&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="1341872">SERVER-47974</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1341881">SERVER-47975</issuekey>
        </issuelink>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1372079">SERVER-48589</issuekey>
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            <issuelink>
            <issuekey id="1130311">SERVER-45983</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1341934">SERVER-47982</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1341964">SERVER-47986</issuekey>
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            <issuekey id="1380942">SERVER-48883</issuekey>
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