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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-51753] Handle applyOps during tenant migrations</title>
                <link>https://jira.mongodb.org/browse/SERVER-51753</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;First, we need to decide if applyOps needs to be synchronized with tenant migrations. applyOps is not supported in &lt;a href=&quot;https://docs.google.com/document/d/10heZ18gZQw3x4MFPaTcY1Pwb0XCW7aSsEX5-cSe-nvs/edit#heading=h.d2pgvnubdq8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;API Version 1&lt;/a&gt;, but MongoMirror uses it. So, we should check if MongoMirror and a tenant migration could ever be run simultaneously against a serverless replica set.&lt;/p&gt;

&lt;p&gt;My guess is we should synchronize applyOps with tenant migrations, to be on the safe side.&lt;/p&gt;

&lt;p&gt;&amp;#8211;&lt;/p&gt;

&lt;p&gt;When we&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b4cd12f6dddc0d84ca1396176b39260c1777fba8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;made&lt;/a&gt; TenantMigrationConflict include the shared_ptr&amp;lt;TenantMigrationAccessBlocker&amp;gt;, we noticed that if TenantMigrationConflict was thrown in the op observer for applyOps, the shared_ptr got lost somewhere on the way back up to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/5d0c679c5c890d6baa2960511f62adb5a8ad0c70/src/mongo/db/repl/tenant_migration_donor_util.h#L102-L111&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;migrationConflictHandler&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Therefore, we disabled making applyOps wait for the migration to commit or abort.&lt;/p&gt;

&lt;p&gt;This ticket is to:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;make applyOps wait for the migration to commit or abort at the point where it catches the TenantMigrationConflict error,&lt;/li&gt;
	&lt;li&gt;confirm that TenantMigrationCommitted/TenantMigrationAborted are reported in line with how other errors are reported for applyOps. In particular, for non-atomic applyOps, it may be possible that some of the operations occurred but others didn&apos;t. Does the applyOps response need to indicate this in some way?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I think for applyOps, the oplog entries are written &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1e8ea257b835c4d8e130205a2fd8297bcccbd47/src/mongo/db/repl/apply_ops.cpp#L189&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; or &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1e8ea257b835c4d8e130205a2fd8297bcccbd47/src/mongo/db/repl/apply_ops.cpp#L254&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;, and TenantMigrationConflict gets caught &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1e8ea257b835c4d8e130205a2fd8297bcccbd47/src/mongo/db/repl/apply_ops.cpp#L257-L265&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1519053">SERVER-51753</key>
            <summary>Handle applyOps during tenant migrations</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="cheahuychou.mao@mongodb.com">Cheahuychou Mao</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>pm-1791_milestone-A</label>
                            <label>pm-1791_non-cloud-blocking</label>
                    </labels>
                <created>Mon, 19 Oct 2020 22:38:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:01:42 +0000</updated>
                            <resolved>Thu, 11 Mar 2021 02:13:53 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="3658326" author="xgen-internal-githook" created="Thu, 11 Mar 2021 02:12:16 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Cheahuychou Mao&apos;, &apos;email&apos;: &apos;mao.cheahuychou@gmail.com&apos;, &apos;username&apos;: &apos;cheahuychou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51753&quot; title=&quot;Handle applyOps during tenant migrations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51753&quot;&gt;&lt;del&gt;SERVER-51753&lt;/del&gt;&lt;/a&gt; Handle applyOps during tenant migrations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d2b168db25d982ca5d3bb62e3d4465f05f797ff5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d2b168db25d982ca5d3bb62e3d4465f05f797ff5&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1683329">SERVER-56188</issuekey>
        </issuelink>
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