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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-64515] Remove claims of prepare behavior from linearizable reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-64515</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As a premise, 5.0 introduced an optimization for sharded transactions to return to the client after the decision was persisted but before the participating shards commit their local storage transactions. That optimization made it incorrect for linearizable reads to ignore prepare conflicts.&lt;/p&gt;

&lt;p&gt;I have no evidence we actually change the prepare conflict behavior for linearizable reads, but &lt;a href=&quot;https://github.com/mongodb/mongo/blob/e1ab3976f52497cb516b95c752eb81d4a69e3bbf/src/mongo/db/read_concern_mongod.cpp#L474-L482&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;we do have code&lt;/a&gt; that suggests we may have at some point. That code (according to a patch run) can be deleted.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2001848">SERVER-64515</key>
            <summary>Remove claims of prepare behavior from linearizable reads</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="1" iconUrl="https://jira.mongodb.org/images/icons/statuses/open.png" description="">Open</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>repl-shortlist</label>
                    </labels>
                <created>Tue, 15 Mar 2022 15:18:20 +0000</created>
                <updated>Thu, 22 Jun 2023 21:28:06 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4425740" author="daniel.gottlieb@10gen.com" created="Tue, 22 Mar 2022 02:59:59 +0000"  >&lt;blockquote&gt;
&lt;p&gt;Linearizable reads do enforce prepare conflicts at read time, as indicated here. &lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;Yes, I agree that in practice, we do enforce prepared conflicts. Because of the code you linked.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;The linked code in the description changes that prepare conflict behavior for the oplog write at the end of the operation.&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;I am also in agreement with this statement. However, because we are (correctly) enforcing prepared conflicts, it&apos;s unnecessary to change any prepare conflict configuration to do the oplog write at the end. If we did have some bug where we were ignoring prepare conflicts for linearizable reads, the code I linked would mask the bug instead of letting WT raise an error.&lt;/p&gt;</comment>
                            <comment id="4425345" author="judah.schvimer" created="Mon, 21 Mar 2022 21:35:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;, does this suggest there is a bug? Linearizable reads do enforce prepare conflicts at read time, as indicated &lt;a href=&quot;https://github.com/10gen/mongo/blob/22140dacf9c355f702da3c5d4892df709ceead66/src/mongo/db/read_concern_mongod.cpp#L246-L251&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;. The linked code in the description changes that prepare conflict behavior for the oplog write at the end of the operation. &lt;/p&gt;</comment>
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                <issuelinks>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="2375175">SERVER-78365</issuekey>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="611093">SERVER-37364</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1989735">SERVER-63971</issuekey>
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