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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-72744] Handle commits for split prepared transactions on primary</title>
                <link>https://jira.mongodb.org/browse/SERVER-72744</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After a secondary splits and applies a prepared transaction, it can step up to be a primary. In that case we will need to eventually commit the transaction while it has been split. Primary needs to check if the transaction to commit has been split and take the following actions if so:&lt;/p&gt;

&lt;p&gt;&quot;Committing a split transaction on a primary requires special care to ensure that the operation is atomic in case of failure.&#160; We will take an IX lock on the RSTL, and we will reserve an oplog slot for the commit prior to attempting to commit any of the split transactions.&#160; We will loop through the splits, set the session/transaction information on the opCtx to each split, and commit each split (&lt;b&gt;commitPreparedTransaction&lt;/b&gt;) through the TransactionParticipant in an &lt;b&gt;UnreplicatedWritesBlock&lt;/b&gt;.&#160; This will cause the splits to commit as if they are on a secondary with no oplog writes.&#160; When this is complete we will restore the original session/transaction information and call &lt;b&gt;commitPreparedTransaction&lt;/b&gt; on the top level transaction, passing in the reserved optime.&#160; The TransactionParticipant normally rejects commits with reserved optimes on primary, but if the participant is in &quot;splitPrepare&quot; state, it will accept only such commits.&#160; It will skip actually trying to commit the transaction (because no transaction exists), but will write the commit oplog entry (which will update the transaction table) and update statistics as normal.&#160; Any failure in this process after reserving the optime must crash the server.&quot;&lt;/p&gt;

&lt;p&gt;Note that normally when calling &lt;b&gt;CommitTransaction&lt;/b&gt; on the transactionParticipant, the session is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d65e291d0bbf97b60e97203b446c3d309dfbb606/src/mongo/db/service_entry_point_common.cpp#L982&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;already checked out&lt;/a&gt;, but in the split case, only the top-level session will be checked out before calling &lt;b&gt;CommitTransaction&lt;/b&gt;&#160;on the transactionParticipant, so we need to manually checkout the split sessions when committing the splits.&lt;/p&gt;

&lt;p&gt;This ticket handles commits for split transactions, while &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72745&quot; title=&quot;Handle aborts for split prepared transactions on primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72745&quot;&gt;&lt;del&gt;SERVER-72745&lt;/del&gt;&lt;/a&gt; will add handling for aborts.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2230595">SERVER-72744</key>
            <summary>Handle commits for split prepared transactions on primary</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="wenbin.zhu@mongodb.com">Wenbin Zhu</reporter>
                        <labels>
                    </labels>
                <created>Wed, 11 Jan 2023 18:27:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:28:24 +0000</updated>
                            <resolved>Mon, 6 Feb 2023 18:19:02 +0000</resolved>
                                                    <fixVersion>6.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5171229" author="xgen-internal-githook" created="Mon, 6 Feb 2023 17:00:03 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;username&apos;: &apos;dgottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72744&quot; title=&quot;Handle commits for split prepared transactions on primary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72744&quot;&gt;&lt;del&gt;SERVER-72744&lt;/del&gt;&lt;/a&gt;: Introduce code path for a primary to commit a split prepared transaction.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a7b6c12cd6975e17148a7effa7d964936619f0b5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a7b6c12cd6975e17148a7effa7d964936619f0b5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5106826" author="JIRAUSER1258790" created="Wed, 11 Jan 2023 18:37:52 +0000"  >&lt;p&gt;At this point, we don&apos;t have secondary logic to split the prepared transactions, so we are not able to write jstests for this ticket, so for this tickets we will probably only write unit tests for TransactionParticipant.&lt;/p&gt;</comment>
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            <issuekey id="2230597">SERVER-72745</issuekey>
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