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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-75800] Batch prepared commitTransaction/abortTransaction entries when possible</title>
                <link>https://jira.mongodb.org/browse/SERVER-75800</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is a follow-up of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-72502&quot; title=&quot;Implement oplog batcher changes for parallelizing prepared transaction application&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72502&quot;&gt;&lt;del&gt;SERVER-72502&lt;/del&gt;&lt;/a&gt;, which batches prepareTransaction entries, while leaving commitTransaction/abortTransaction entries to be processed individually. Technically commits and aborts can be batched with other non-prepare oplog entries, except for certain edge cases (e.g. the prepareTransaction entries that they refer to are prepared prior to stepdown or prepared during to recovery/rollback, in which cases the prepared transactions have not been split). We cannot use splitSessionManager to check for transaction being split in OplogBatcher since that has race with OplogApplier, we need to investigate and do it in another way.&lt;/p&gt;

&lt;p&gt;EDIT: We ended up only allowing commitTransaction/abortTransaction to be batched with other commitTransaction/abortTransaction entries. This is good enough in terms of performance and introduces less risks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2308893">SERVER-75800</key>
            <summary>Batch prepared commitTransaction/abortTransaction entries when possible</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="13201">Fixed</resolution>
                                        <assignee username="wenbin.zhu@mongodb.com">Wenbin Zhu</assignee>
                                    <reporter username="wenbin.zhu@mongodb.com">Wenbin Zhu</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Apr 2023 16:36:17 +0000</created>
                <updated>Sun, 29 Oct 2023 21:23:28 +0000</updated>
                            <resolved>Tue, 25 Apr 2023 04:18:43 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5372415" author="xgen-internal-githook" created="Mon, 24 Apr 2023 23:40:01 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75800&quot; title=&quot;Batch prepared commitTransaction/abortTransaction entries when possible&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75800&quot;&gt;&lt;del&gt;SERVER-75800&lt;/del&gt;&lt;/a&gt; Allow commitTransaction and abortTransaction entries to be batched with themselves.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/be2b4a191ec938448fb4c5c601fe27955b66605f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/be2b4a191ec938448fb4c5c601fe27955b66605f&lt;/a&gt;&lt;/p&gt;</comment>
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