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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-39926] Migrations may not transfer writes from prepared transactions committed during cloning phase</title>
                <link>https://jira.mongodb.org/browse/SERVER-39926</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;If a transaction commits during the cloning phase of a chunk migration on the donor shard, any writes from the transaction are added to the transfer mods buffer &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2fccb141496d8580735de6e05f7d0985c4f5dbd0/src/mongo/db/s/op_observer_sharding_impl.cpp#L169-L199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;by an op observer that registers onCommit handlers&lt;/a&gt; on the WriteUnitOfWork of the opCtx given to the observer.&lt;/p&gt;

&lt;p&gt;This relies on the WUOW committing and its handlers running before the locks associated with the transaction are dropped, so the donor shard can&apos;t enter the critical section without seeing the writes (which requires an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2fccb141496d8580735de6e05f7d0985c4f5dbd0/src/mongo/db/s/collection_sharding_runtime.cpp#L183-L189&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;X lock on the migrating collection&lt;/a&gt;).&lt;/p&gt;

&lt;p&gt;This is true for transactions that commit without prepare, but when committing a prepared transaction, the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/df3f76da935a45302d7b24b0abe618af6dd34744/src/mongo/db/transaction_participant.cpp#L1159&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;transaction is committed to storage and its locks are dropped&lt;/a&gt; &lt;em&gt;before&lt;/em&gt; the transaction commit &lt;a href=&quot;https://github.com/mongodb/mongo/blob/df3f76da935a45302d7b24b0abe618af6dd34744/src/mongo/db/transaction_participant.cpp#L1165-L1166&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;op observer runs with a new WUOW&lt;/a&gt;. This allows the donor shard to enter the critical section and finish the migration without transferring the transaction&apos;s writes to the recipient, losing data.&lt;/p&gt;</description>
                <environment></environment>
        <key id="707621">SERVER-39926</key>
            <summary>Migrations may not transfer writes from prepared transactions committed during cloning phase</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="blake.oler@mongodb.com">Blake Oler</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 Mar 2019 20:56:49 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:21 +0000</updated>
                            <resolved>Fri, 8 Mar 2019 11:26:17 +0000</resolved>
                                                    <fixVersion>4.1.9</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2175536" author="xgen-internal-githook" created="Fri, 8 Mar 2019 11:25:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Blake Oler&apos;, &apos;username&apos;: &apos;BlakeIsBlake&apos;, &apos;email&apos;: &apos;blake.oler@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39926&quot; title=&quot;Migrations may not transfer writes from prepared transactions committed during cloning phase&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39926&quot;&gt;&lt;del&gt;SERVER-39926&lt;/del&gt;&lt;/a&gt; Observe prepared transactions on prepare for migration to guarantee collection locking&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/52f41f0a7aeaac855ce088387d1d82148bfba6e0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/52f41f0a7aeaac855ce088387d1d82148bfba6e0&lt;/a&gt;&lt;/p&gt;</comment>
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