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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-66541] Clear the Collection Sharding State map during the setFCV command</title>
                <link>https://jira.mongodb.org/browse/SERVER-66541</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The goal of this task is to clear the Collection Sharding State map (i.e. all collections) during the setFCV upgrade to 6.0.&lt;/p&gt;

&lt;p&gt;The reason to do that is to define a barrier from which all shards must know what they own at all moment. We can do this because since 5.3 we introduced a new migration protocol that guarantees that both donor and recipient update their filtering information as part of the commit phase. Before that, we had a weaker guarantee: the donor for sure knew about the migration but for the recipient we just triggered a best-effort refresh.&lt;/p&gt;

&lt;p&gt;This change should land on 6.0.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2049447">SERVER-66541</key>
            <summary>Clear the Collection Sharding State map during the setFCV command</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="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</assignee>
                                    <reporter username="sergi.mateo-bellido@mongodb.com">Sergi Mateo Bellido</reporter>
                        <labels>
                    </labels>
                <created>Wed, 18 May 2022 12:24:14 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:08 +0000</updated>
                            <resolved>Mon, 20 Jun 2022 08:02:41 +0000</resolved>
                                                    <fixVersion>6.0.0-rc11</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4626444" author="xgen-internal-githook" created="Mon, 20 Jun 2022 07:59:44 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66541&quot; title=&quot;Clear the Collection Sharding State map during the setFCV command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66541&quot;&gt;&lt;del&gt;SERVER-66541&lt;/del&gt;&lt;/a&gt; Rely on a refresh to define the metadata barrier&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f9c9120058d3d5597a282bc72e6bc4ced2517212&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f9c9120058d3d5597a282bc72e6bc4ced2517212&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4626443" author="xgen-internal-githook" created="Mon, 20 Jun 2022 07:59:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66541&quot; title=&quot;Clear the Collection Sharding State map during the setFCV command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66541&quot;&gt;&lt;del&gt;SERVER-66541&lt;/del&gt;&lt;/a&gt; Clear the filtering metadata on setFCV&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 7bc0a21e572227371d79553a3263a142752fae56.&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd97dc5f81ddce5415fedf539b11246910f8f676&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd97dc5f81ddce5415fedf539b11246910f8f676&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4615259" author="xgen-internal-githook" created="Tue, 14 Jun 2022 17:35:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Sergi Mateo Bellido&apos;, &apos;email&apos;: &apos;sergi.mateo-bellido@mongodb.com&apos;, &apos;username&apos;: &apos;smateo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66541&quot; title=&quot;Clear the Collection Sharding State map during the setFCV command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66541&quot;&gt;&lt;del&gt;SERVER-66541&lt;/del&gt;&lt;/a&gt; Clear the filtering metadata on setFCV&lt;/p&gt;

&lt;p&gt;Relying on config.cache.collections to signal secondary nodes&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7bc0a21e572227371d79553a3263a142752fae56&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7bc0a21e572227371d79553a3263a142752fae56&lt;/a&gt;&lt;/p&gt;</comment>
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