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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-34369] LastOpFixer can set Client optime backwards in sessions</title>
                <link>https://jira.mongodb.org/browse/SERVER-34369</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In write_ops_exec.cpp, there is a class called LastOpsFixer, which sets the client&apos;s optime to the system time in the case of a failed or no-op write (e.g. a $set of a field to the value it is already set to).  &lt;/p&gt;

&lt;p&gt;As long as LastOpsFixer runs outside any WriteUnitOfWork (the normal case), this is fine.  However, with sessions we can have a long-lived outer WUOW.  In this case, if we have multiple operations, one of them can succeed and one can be a no-op.  The successful operation will set the client optime to its optime &lt;em&gt;on WUOW commit&lt;/em&gt;.  The no-op will set the client optime to the system optime &lt;em&gt;immediately&lt;/em&gt;.&lt;/p&gt;

&lt;p&gt;If other operations happen in between the successful operation and the no-op, advancing the system optime, this results in the commit setting the client optime backwards (and hitting an invariant).&lt;/p&gt;

&lt;p&gt;This currently happens only when writing in a snapshot read.&lt;/p&gt;</description>
                <environment></environment>
        <key id="523387">SERVER-34369</key>
            <summary>LastOpFixer can set Client optime backwards in sessions</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="13203">Gone away</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Fri, 6 Apr 2018 20:15:18 +0000</created>
                <updated>Fri, 27 Oct 2023 20:43:29 +0000</updated>
                            <resolved>Thu, 12 Apr 2018 18:16:35 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1858116" author="matthew.russotto" created="Fri, 6 Apr 2018 20:17:20 +0000"  >&lt;p&gt;If we&apos;re going to disallow writing in a snapshot read, this might not need fixing; it doesn&apos;t happen with transactions currently (because they write oplog entries only on commit), and shouldn&apos;t happen when we&apos;re logging oplog entries in advance of the commit (because those entries will commit outside the main transaction).&lt;/p&gt;</comment>
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