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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-40177] Enforce prepare conflicts on secondaries</title>
                <link>https://jira.mongodb.org/browse/SERVER-40177</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-39074&quot; title=&quot;Update outside transaction erasing update from committed prepared transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-39074&quot;&gt;&lt;del&gt;SERVER-39074&lt;/del&gt;&lt;/a&gt; is complete, all operations default to enforcing prepare conflicts. Unfortunately, due to the problem described in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40176&quot; title=&quot;Cursor seekExact should not use WT_CURSOR:search_near to avoid unintentional prepare conflicts&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40176&quot;&gt;&lt;del&gt;SERVER-40176&lt;/del&gt;&lt;/a&gt;, this means that occasionally, prepare conflicts can be encountered when otherwise valid cursor seeks are adjacent to prepared records.&lt;/p&gt;

&lt;p&gt;This is only problematic for &quot;applyOps&quot; entries because &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9acc250dc9b6ce92f1cee13b404a408e17804564/src/mongo/db/repl/oplog.cpp#L1690&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;inserts ops are converted to upserts&lt;/a&gt;. This means a query on a nonexistent record, which uses search_near, can land on an adjacent record that is part of a prepared transaction, introducing a prepare conflict that would not have happened on a primary.&lt;/p&gt;

&lt;p&gt;Transaction use &quot;applyOps&quot;, but all inserts as part of transactions should be able to be applied as inserts instead of upserts. This also means prepare conflicts can be enforced during secondary batch application.&lt;/p&gt;</description>
                <environment></environment>
        <key id="717611">SERVER-40177</key>
            <summary>Enforce prepare conflicts on secondaries</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="louis.williams@mongodb.com">Louis Williams</assignee>
                                    <reporter username="louis.williams@mongodb.com">Louis Williams</reporter>
                        <labels>
                            <label>prepare_optional</label>
                    </labels>
                <created>Fri, 15 Mar 2019 20:55:17 +0000</created>
                <updated>Sun, 29 Oct 2023 22:22:53 +0000</updated>
                            <resolved>Fri, 31 May 2019 19:20:45 +0000</resolved>
                                                    <fixVersion>4.1.14</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="2267095" author="xgen-internal-githook" created="Fri, 31 May 2019 17:27:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Louis Williams&apos;, &apos;email&apos;: &apos;louis.williams@mongodb.com&apos;, &apos;username&apos;: &apos;louiswilliams&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40177&quot; title=&quot;Enforce prepare conflicts on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40177&quot;&gt;&lt;del&gt;SERVER-40177&lt;/del&gt;&lt;/a&gt; Enforce prepare conflicts on secondaries&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/0c99d93518b8647a16897a3bf1bb318221a2ccec&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/0c99d93518b8647a16897a3bf1bb318221a2ccec&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2182425" author="judah.schvimer" created="Sat, 16 Mar 2019 22:16:50 +0000"  >&lt;p&gt;IIUC, this is optional for &quot;prepare&quot; completion, but recommended for long term code safety. We are effectively relaxing a constraint during secondary oplog application that we should not have to relax.&lt;/p&gt;</comment>
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            <issuekey id="717608">SERVER-40176</issuekey>
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