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    <title>MongoDB Jira</title>
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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-74032] MigrationSource manager should emit op entries on the committed request while still blocking user writes</title>
                <link>https://jira.mongodb.org/browse/SERVER-74032</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today, the &lt;tt&gt;MigrationSourceManager&lt;/tt&gt; may emit up to two op entries upon the commit of a chunk migration (&lt;a href=&quot;https://github.com/10gen/mongo/blob/4419eadec02979c6ce26d06c40845ec93a7ce67c/src/mongo/db/s/migration_source_manager.cpp#L442-L443&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;one&lt;/a&gt; to signal the arrival of the first collection chunk on the recipient, &lt;a href=&quot;https://github.com/10gen/mongo/blob/4419eadec02979c6ce26d06c40845ec93a7ce67c/src/mongo/db/s/migration_source_manager.cpp#L623-L624&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;another&lt;/a&gt; to report the eviction of the last collection chunk from the donor).&lt;/p&gt;

&lt;p&gt;For the latter, all the conditions required by change streams are guaranteed:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the op entry generation follows the commit on the config server while user writes are still blocked,&lt;/li&gt;
	&lt;li&gt;at-least-once delivery is &lt;a href=&quot;https://github.com/10gen/mongo/blob/4419eadec02979c6ce26d06c40845ec93a7ce67c/src/mongo/db/s/migration_util.cpp#L698-L701&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;guaranteed&lt;/a&gt; upon stepdown&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;But for the former, it turns out that:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;the op entry generation &lt;a href=&quot;https://github.com/10gen/mongo/blob/4419eadec02979c6ce26d06c40845ec93a7ce67c/src/mongo/db/s/shardsvr_move_range_command.cpp#L265-L267&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;precedes the commit&lt;/a&gt; on the config server&lt;/li&gt;
	&lt;li&gt;at the time of the generation, user writes are &lt;a href=&quot;https://github.com/10gen/mongo/blob/4419eadec02979c6ce26d06c40845ec93a7ce67c/src/mongo/db/s/migration_source_manager.cpp#L458&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;not yet blocked&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;there are no guarantees for at-least-once delivery upon stepdown.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This may lead to potential event loss scenarios within specific time windows.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2265239">SERVER-74032</key>
            <summary>MigrationSource manager should emit op entries on the committed request while still blocking user writes</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="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="paolo.polato@mongodb.com">Paolo Polato</assignee>
                                    <reporter username="paolo.polato@mongodb.com">Paolo Polato</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Feb 2023 09:09:42 +0000</created>
                <updated>Tue, 6 Feb 2024 14:00:39 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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            <issuekey id="2543310">SERVER-84761</issuekey>
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