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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-50174] Multiple concurrent migration recoveries after step-up can race for the fixed Lsid/TxnNumber</title>
                <link>https://jira.mongodb.org/browse/SERVER-50174</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;All &lt;a href=&quot;https://github.com/mongodb/mongo/blob/72d104ca45461075fc7a4deb11d3522ff24c62f6/src/mongo/db/s/migration_coordinator.cpp#L70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;MigrationCoordinator&lt;/tt&gt;(s)&lt;/a&gt; started from a single MongoD instance share &lt;a href=&quot;https://github.com/mongodb/mongo/blob/72d104ca45461075fc7a4deb11d3522ff24c62f6/src/mongo/db/s/migration_coordinator.cpp#L57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the same logical session id&lt;/a&gt; for any operations that they perform (for the lifetime of that instance). Because of this, it is never correct that two migration coordinators exist at the same time.&lt;/p&gt;

&lt;p&gt;Under normal circumstances, this is guaranteed by the acquisition of the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/21d5a8e5bd822e71e5fb8feb2f9e71a7e8cf25f9/src/mongo/db/s/active_migrations_registry.h#L178&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;MigrationBlockingGuard&lt;/tt&gt;&lt;/a&gt; at the beginning of each migration. However, in the case where an incomplete migration needs to be recovered, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b5120d585bcc3f00b3378466b1db5277efe48320/src/mongo/db/s/migration_util.cpp#L798&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;don&apos;t take it&lt;/a&gt;. Because of this, it is possible that a migration for a completely unrelated collection can start while a different collection is still running recovery.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1434852">SERVER-50174</key>
            <summary>Multiple concurrent migration recoveries after step-up can race for the fixed Lsid/TxnNumber</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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>PM-1645-Milestone-1</label>
                    </labels>
                <created>Fri, 7 Aug 2020 11:13:25 +0000</created>
                <updated>Sun, 29 Oct 2023 22:04:42 +0000</updated>
                            <resolved>Sat, 8 Aug 2020 07:09:38 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3328498" author="xgen-internal-githook" created="Fri, 7 Aug 2020 19:48:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50174&quot; title=&quot;Multiple concurrent migration recoveries after step-up can race for the fixed Lsid/TxnNumber&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50174&quot;&gt;&lt;del&gt;SERVER-50174&lt;/del&gt;&lt;/a&gt; Make MigrationCoordinator recovery acquire the MigrationBlockingGuard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2931f3c764f8e093ae31adb4b2b62c1ce01d7421&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2931f3c764f8e093ae31adb4b2b62c1ce01d7421&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1955958">SERVER-62245</issuekey>
        </issuelink>
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