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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-71938] Avoid applying commitTransaction entry individually if it refers to a prepare entry in the same batch</title>
                <link>https://jira.mongodb.org/browse/SERVER-71938</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;With the current design, when the oplog batcher decides a commitTransaction oplog entry needs to be applied individually (&lt;tt&gt;OplogBatcher::mustProcessIndividually&lt;/tt&gt;), it will check if the commitTransaction entry refers to a session in the &lt;tt&gt;SplitPrepareSessionManager&lt;/tt&gt;, and will process it individually if not. However if the commitTransaction entry and the prepare entry it refers to come from the same batch, this check will always fail since we have yet called &lt;tt&gt;SplitPrepareSessionManager&lt;/tt&gt; to split the session at this point.&lt;/p&gt;

&lt;p&gt;This results in us unnecessarily apply certain commitTransaction entries in their own batch, although it&apos;s not very common to have the commitTransaction entry and the prepare entry it refers to coming from the same batch because the prepare must be majority committed before the commit command is run.&lt;/p&gt;

&lt;p&gt;To avoid this, the oplog batcher needs save some state (either setting in itself or in SplitPrepareSessionManager) when it sees a prepare entry to indicate that there is a prepare to be split, and later when it sees a following commitTransaction entry in the same batch, it knows that it refers to a to-be-split prepare and that we can put it in the same batch with the prepare entry.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2205355">SERVER-71938</key>
            <summary>Avoid applying commitTransaction entry individually if it refers to a prepare entry in the same batch</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="wenbin.zhu@mongodb.com">Wenbin Zhu</reporter>
                        <labels>
                    </labels>
                <created>Wed, 7 Dec 2022 19:50:45 +0000</created>
                <updated>Thu, 30 Mar 2023 15:50:08 +0000</updated>
                            <resolved>Thu, 30 Mar 2023 15:50:08 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5312452" author="JIRAUSER1258790" created="Thu, 30 Mar 2023 15:50:08 +0000"  >&lt;p&gt;We are not going to group commits/aborts with other prepares, closing.&lt;/p&gt;</comment>
                            <comment id="5122396" author="JIRAUSER1258790" created="Wed, 18 Jan 2023 22:42:55 +0000"  >&lt;p&gt;There is an additional caveat: once this is done, we could have multiple prepares for the same session in the same batch, e.g. &lt;span class=&quot;error&quot;&gt;&amp;#91;prepare, commit, prepare, commit&amp;#93;&lt;/span&gt;. When we dispatch the ops to the writer vectors, we need to call SplitPrepareSessionManager to create split sessions. However it currently disallows an already split top-level session to be split again without releasing. If we do this, we need to change that behavior to allow multiple splits on the same top-level session as long as they refer to different txnNumber&apos;s.&lt;/p&gt;</comment>
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            <issuekey id="2223446">SERVER-72502</issuekey>
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