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    <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-76741] Split-prepare transactions are aborted before reserving abort oplog entry</title>
                <link>https://jira.mongodb.org/browse/SERVER-76741</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Primary &lt;a href=&quot;https://github.com/mongodb/mongo/blob/07efe95e998e3f8305c4ec215761e0ec7b9e8012/src/mongo/db/transaction/transaction_participant.cpp#L2174-L2184&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;aborts the split-prepared transactions&lt;/a&gt;&#160;before&#160;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/07efe95e998e3f8305c4ec215761e0ec7b9e8012/src/mongo/db/transaction/transaction_participant.cpp#L2197-L2200&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;it reserves the abort oplog entry&lt;/a&gt;. This is a bug as it violates the assumption noted in the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/07efe95e998e3f8305c4ec215761e0ec7b9e8012/src/mongo/db/transaction/transaction_participant.cpp#L2197-L2199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;comment&lt;/a&gt;.&lt;/p&gt;



&lt;p&gt;This bug would enable a sequence like the following - Let&apos;s say we have Txn1 and Txn2 that write to the same set of documents:&lt;br/&gt;
1. Txn1 is split and prepared on a node when the node was a secondary&lt;br/&gt;
2. The node steps up as a primary&lt;br/&gt;
3. The node aborts Txn1&apos;s split prepared transaction&lt;br/&gt;
4. Now, the node is able to prepare Txn2 with prepareOptime T1 since Txn1 is effectively aborted&lt;br/&gt;
5. The node reserves and writes abort oplog entry for Txn1 with optime T2&lt;/p&gt;

&lt;p&gt;In this case, secondaries would see prepare of Txn2 before abort of Txn1, resulting in prepare conflicts when applying Txn2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2329492">SERVER-76741</key>
            <summary>Split-prepare transactions are aborted before reserving abort oplog entry</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="wenbin.zhu@mongodb.com">Wenbin Zhu</assignee>
                                    <reporter username="lingzhi.deng@mongodb.com">Lingzhi Deng</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 May 2023 01:51:49 +0000</created>
                <updated>Sun, 29 Oct 2023 21:22:10 +0000</updated>
                            <resolved>Wed, 3 May 2023 22:07:17 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="5401822" author="xgen-internal-githook" created="Thu, 4 May 2023 18:52:59 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76741&quot; title=&quot;Split-prepare transactions are aborted before reserving abort oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76741&quot;&gt;&lt;del&gt;SERVER-76741&lt;/del&gt;&lt;/a&gt; Split prepared transactions should be aborted after reserving abort oplog slot.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 9cf95efcbd37df83bcd9af4593e79c51ea4062ea)&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/771fb1554b7ea624570ad0aeb317c5f2411719b4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/771fb1554b7ea624570ad0aeb317c5f2411719b4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5399162" author="xgen-internal-githook" created="Wed, 3 May 2023 22:04:20 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-76741&quot; title=&quot;Split-prepare transactions are aborted before reserving abort oplog entry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-76741&quot;&gt;&lt;del&gt;SERVER-76741&lt;/del&gt;&lt;/a&gt; Split prepared transactions should be aborted after reserving abort oplog slot.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/9cf95efcbd37df83bcd9af4593e79c51ea4062ea&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/9cf95efcbd37df83bcd9af4593e79c51ea4062ea&lt;/a&gt;&lt;/p&gt;</comment>
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