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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-76801] Make MovePrimaryDonor::onBeganBlockingWrites() Idempotent</title>
                <link>https://jira.mongodb.org/browse/SERVER-76801</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;It&apos;s possible for the ShardingDDLCoordinator to receive a PrimarySteppedDown error and &lt;a href=&quot;https://github.com/10gen/mongo/blob/793343a30bc55a30457a9a45c4b189c1af5f0d7f/src/mongo/db/s/sharding_ddl_coordinator.cpp#L378-L387&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;retry&lt;/a&gt; before its stepdown token is cancelled to prevent the retry. If this happens while the MovePrimaryCoordinator is in the &lt;a href=&quot;https://github.com/10gen/mongo/blob/793343a30bc55a30457a9a45c4b189c1af5f0d7f/src/mongo/db/s/move_primary_coordinator.cpp#L226&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;kCatchup phase&lt;/a&gt;, it is possible that it calls MovePrimaryDonor::onBeganBlockingWrites() multiple times, triggering an invariant by &lt;a href=&quot;https://github.com/10gen/mongo/blob/793343a30bc55a30457a9a45c4b189c1af5f0d7f/src/mongo/db/s/move_primary/move_primary_donor_service.cpp#L644-L646&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;setting the promise twice&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Similarly to &lt;a href=&quot;https://github.com/10gen/mongo/blob/793343a30bc55a30457a9a45c4b189c1af5f0d7f/src/mongo/db/s/move_primary/move_primary_donor_service.cpp#L648-L654&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MovePrimaryDonor::onReadyToForget()&lt;/a&gt;, MovePrimaryDonor::onBeganBlockingWrites() should do nothing if the promise was already set.&lt;/p&gt;

&lt;p&gt;Despite the fact that the critical section is taken by the coordinator &lt;a href=&quot;https://github.com/10gen/mongo/blob/793343a30bc55a30457a9a45c4b189c1af5f0d7f/src/mongo/db/s/move_primary_coordinator.cpp#L747-L748&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;with local write concern&lt;/a&gt;, the donor does not transition to blocking writes until it &lt;a href=&quot;https://github.com/10gen/mongo/blob/793343a30bc55a30457a9a45c4b189c1af5f0d7f/src/mongo/db/s/move_primary/move_primary_donor_service.cpp#L683-L698&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;persists the blocking timestamp with majority write concern&lt;/a&gt;. In other words, there is no risk that acquiring the critical section is rolled back while the donor believes that it is still held because both the coordinator and donor are running on the same node.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2331286">SERVER-76801</key>
            <summary>Make MovePrimaryDonor::onBeganBlockingWrites() Idempotent</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="brett.nawrocki@mongodb.com">Brett Nawrocki</assignee>
                                    <reporter username="brett.nawrocki@mongodb.com">Brett Nawrocki</reporter>
                        <labels>
                            <label>sharding-nyc-subteam1</label>
                    </labels>
                <created>Wed, 3 May 2023 18:12:10 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:03 +0000</updated>
                            <resolved>Thu, 4 May 2023 19:32:12 +0000</resolved>
                                    <version>7.0.0-rc0</version>
                    <version>7.1.0-rc0</version>
                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5401937" author="xgen-internal-githook" created="Thu, 4 May 2023 19:29:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Brett Nawrocki&apos;, &apos;email&apos;: &apos;brett.nawrocki@mongodb.com&apos;, &apos;username&apos;: &apos;brettnawrocki&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76801&quot; title=&quot;Make MovePrimaryDonor::onBeganBlockingWrites() Idempotent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76801&quot;&gt;&lt;del&gt;SERVER-76801&lt;/del&gt;&lt;/a&gt; Make MovePrimaryDonor::onBeganBlockingWrites() Idempotent&lt;/p&gt;

&lt;p&gt;(cherry picked from commit aed68b23fdcf10abdf242e4351c140705026f626)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6356d1e29db503ac68a31c8d61624ba4881f5a97&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6356d1e29db503ac68a31c8d61624ba4881f5a97&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5399274" author="xgen-internal-githook" created="Wed, 3 May 2023 22:48:06 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Brett Nawrocki&apos;, &apos;email&apos;: &apos;brett.nawrocki@mongodb.com&apos;, &apos;username&apos;: &apos;brettnawrocki&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76801&quot; title=&quot;Make MovePrimaryDonor::onBeganBlockingWrites() Idempotent&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76801&quot;&gt;&lt;del&gt;SERVER-76801&lt;/del&gt;&lt;/a&gt; Make MovePrimaryDonor::onBeganBlockingWrites() Idempotent&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aed68b23fdcf10abdf242e4351c140705026f626&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aed68b23fdcf10abdf242e4351c140705026f626&lt;/a&gt;&lt;/p&gt;</comment>
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