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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-26885] Possible to complete migration with transferMods buffer not fully drained</title>
                <link>https://jira.mongodb.org/browse/SERVER-26885</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Steps:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Migration initiated.&lt;/li&gt;
	&lt;li&gt;Migration cloneLocs phase complete.&lt;/li&gt;
	&lt;li&gt;Destination finished cloning.&lt;/li&gt;
	&lt;li&gt;New write comes in.&lt;/li&gt;
	&lt;li&gt;New write passes shard version check inside the OpObserver hook.&lt;/li&gt;
	&lt;li&gt;MigrationSourceManager::enterCriticalSection.&lt;/li&gt;
	&lt;li&gt;Donor sends commit command to destination.&lt;/li&gt;
	&lt;li&gt;Destination sends _transferMods and gets an empty response, so it is ready to cleanup and complete the destination side of the migration.&lt;/li&gt;
	&lt;li&gt;Doc _id of write is stored in transferMods buffer.&lt;/li&gt;
	&lt;li&gt;New write returns success.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;I believe the problem is because when we enter the critical section, we take IS lock on the ns:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc2/src/mongo/db/s/migration_source_manager.cpp#L246&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/r3.4.0-rc2/src/mongo/db/s/migration_source_manager.cpp#L246&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;That means that it can run in parallel with the new write that came in since it is compatible with IX.&lt;/p&gt;</description>
                <environment></environment>
        <key id="328915">SERVER-26885</key>
            <summary>Possible to complete migration with transferMods buffer not fully drained</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="9">Done</resolution>
                                        <assignee username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="randolph@mongodb.com">Randolph Tan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Nov 2016 21:17:37 +0000</created>
                <updated>Sat, 19 Nov 2016 00:05:32 +0000</updated>
                            <resolved>Mon, 7 Nov 2016 18:49:40 +0000</resolved>
                                    <version>3.4.0-rc2</version>
                                    <fixVersion>3.4.0-rc3</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1428296" author="xgen-internal-githook" created="Mon, 7 Nov 2016 18:48:54 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;kaloianm&apos;, u&apos;name&apos;: u&apos;Kaloian Manassiev&apos;, u&apos;email&apos;: u&apos;kaloian.manassiev@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26885&quot; title=&quot;Possible to complete migration with transferMods buffer not fully drained&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26885&quot;&gt;&lt;del&gt;SERVER-26885&lt;/del&gt;&lt;/a&gt; Take collection X lock to enter the migration critical section&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/10c5d764eec26b00947ae8e18cfddc5f8b3af629&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/10c5d764eec26b00947ae8e18cfddc5f8b3af629&lt;/a&gt;&lt;/p&gt;</comment>
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