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    <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-55635] Make the setFCV document updates idempotent in a sharded cluster</title>
                <link>https://jira.mongodb.org/browse/SERVER-55635</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As designed in WRITING-7769, when upgrading FCV in a sharded cluster, the configsvr will invoke the setFCV command twice on shardsvrs: phase-1 and phase-2.&lt;/p&gt;

&lt;p&gt;If a stale retry of a setFCV(phase-1) happened after a shard has already entered phase-2, the shard would be left in the temporary (upgrading/downgrading) state (it would enter phase-1 again). This wasn&apos;t an issue when FCV was a monolithic command, but since now it will consist of two different command invocations to the shards, we need to account for it.&lt;/p&gt;

&lt;p&gt;The proposed solution is to add a &apos;timestamp&apos; field to the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6a7d484401c4b773794f181f4621a1959123da72/src/mongo/db/commands/feature_compatibility_version_document.idl#L38&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;FeatureCompatibilityVersionDocument&lt;/a&gt;. This field will be selected and persisted by the ConfigSvr each time a setFCV sequence starts. When the ConfigSvr invokes setFCV on the shards, it will be passed as part of the command parameters and the shards will use it to decide whether they should initiate each phase by performing a compare-and-swap write checking that the timestamp they receive is newer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1663246">SERVER-55635</key>
            <summary>Make the setFCV document updates idempotent in a sharded cluster</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="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>PM-1965-Milestone-0-Metadata-Format</label>
                    </labels>
                <created>Tue, 30 Mar 2021 15:19:46 +0000</created>
                <updated>Sun, 29 Oct 2023 21:55:37 +0000</updated>
                            <resolved>Tue, 27 Apr 2021 14:13:36 +0000</resolved>
                                                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3740862" author="xgen-internal-githook" created="Tue, 27 Apr 2021 13:03:22 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55635&quot; title=&quot;Make the setFCV document updates idempotent in a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55635&quot;&gt;&lt;del&gt;SERVER-55635&lt;/del&gt;&lt;/a&gt; Make the setFCV document updates idempotent in a sharded cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4bc9377034a98b46b19bf4ca109524e6a407cfa0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4bc9377034a98b46b19bf4ca109524e6a407cfa0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3734894" author="xgen-internal-githook" created="Fri, 23 Apr 2021 08:54:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Antonio Fuschetto&apos;, &apos;email&apos;: &apos;antonio.fuschetto@mongodb.com&apos;, &apos;username&apos;: &apos;afuschetto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55635&quot; title=&quot;Make the setFCV document updates idempotent in a sharded cluster&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55635&quot;&gt;&lt;del&gt;SERVER-55635&lt;/del&gt;&lt;/a&gt; Make the setFCV document updates idempotent in a sharded cluster&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b95494949b10daac02ae9c0da2d492d2e3294f6e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b95494949b10daac02ae9c0da2d492d2e3294f6e&lt;/a&gt;&lt;/p&gt;</comment>
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