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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-37481] Add testing to interleave prepared transactions applyOps oplog entry replay and the corresponding write to the transactions table</title>
                <link>https://jira.mongodb.org/browse/SERVER-37481</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The transaction prepare and following commit logic contains some pretty tricky combination of oplog writes in different WUsOW (i.e., the actual applyOps oplog write, the write which changes the state to prepared and writes down the prepare timestamp and the final commit oplog entry write, which ensures visibility).&lt;/p&gt;

&lt;p&gt;Due to the concurrency of the applier threads on the secondaries, these oplog entries can be applied in different order, potentially causing interesting race conditions.&lt;/p&gt;

&lt;p&gt;We could potentially make this logic more robust by adding some testing flag or replication failpont to the applier logic, to cause different interleaving between the applyOps and the updates to the transactions table.&lt;/p&gt;

&lt;p&gt;The simplest thing would be to make all updates to the transactions table to happen before everything else in one test and after everything else in another. This should be enough to shake out any race condition bugs.&lt;/p&gt;</description>
                <environment></environment>
        <key id="614516">SERVER-37481</key>
            <summary>Add testing to interleave prepared transactions applyOps oplog entry replay and the corresponding write to the transactions table</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="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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>prepare_optional</label>
                            <label>prepare_testing</label>
                    </labels>
                <created>Fri, 5 Oct 2018 07:06:27 +0000</created>
                <updated>Tue, 6 Dec 2022 03:16:28 +0000</updated>
                            <resolved>Fri, 17 May 2019 19:14:45 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2250982" author="greg.mckeon" created="Fri, 17 May 2019 19:14:45 +0000"  >&lt;p&gt;Our concurrency testing gives us similar coverage.&lt;/p&gt;</comment>
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            <issuekey id="585636">SERVER-36538</issuekey>
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