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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-77332] Reevaulate migration destination session usage</title>
                <link>https://jira.mongodb.org/browse/SERVER-77332</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The session is &lt;a href=&quot;https://github.com/10gen/mongo/blob/2c11ff69a7c7c475d2c356fc184a2ccffccdfc15/src/mongo/db/s/migration_destination_manager.cpp#L1131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checked out&lt;/a&gt; at the beginning and we &quot;yield&quot; from time to time (&lt;a href=&quot;https://github.com/10gen/mongo/blob/2c11ff69a7c7c475d2c356fc184a2ccffccdfc15/src/mongo/db/s/migration_destination_manager.cpp#L1332&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;example&lt;/a&gt;) during the course of the migration. The main purpose of this session + txnNumber is to prevent older primaries from running the _migrateClone on the destination. However, it also had run into issues (for ex, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76720&quot; title=&quot;Chunk Migration migrates the session history for the migrating session leading to a deadlock&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76720&quot;&gt;&lt;del&gt;SERVER-76720&lt;/del&gt;&lt;/a&gt;) because the session is held for almost the entire duration.&lt;/p&gt;

&lt;p&gt;Some ideas:&lt;br/&gt;
1. Perhaps make migration destination manager a primary only service + possibly additional checks to prevent old instances trying to rerun migrateClone and possibly trigger range deleter on non-orphaned data.&lt;br/&gt;
2. Keep the session + txnNumber but only hold it at the very beginning when checking if it is allowed to continue running. This way we can also get rid of the &quot;yielding&quot; code and won&apos;t have to worry about not forgetting to yield when adding new blocking code.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2345928">SERVER-77332</key>
            <summary>Reevaulate migration destination session usage</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-cluster-scalability">Backlog - Cluster Scalability</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                            <label>ShardingTechDebt</label>
                    </labels>
                <created>Fri, 19 May 2023 18:03:16 +0000</created>
                <updated>Tue, 12 Dec 2023 15:44:10 +0000</updated>
                                                                                                <votes>0</votes>
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