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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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<item>
            <title>[SERVER-64506] Unify replication back-end of TransactionParticipant and WUOW</title>
                <link>https://jira.mongodb.org/browse/SERVER-64506</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Background:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;At the time of writing, a WUOW does not replicate transactionally: a WUOW involving multiple document writes generates one oplog entry (and timestamp) per write. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55909&quot; title=&quot;Prevent a single WUOW from writing multiple oplog entries by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55909&quot;&gt;SERVER-55909&lt;/a&gt; aims to address this issue, and make WUOW&apos;s replicate much like multi-document transactions.&lt;/li&gt;
	&lt;li&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-63047&quot; title=&quot;Make delete batches fully transactional&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-63047&quot;&gt;&lt;del&gt;SERVER-63047&lt;/del&gt;&lt;/a&gt; implements &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55909&quot; title=&quot;Prevent a single WUOW from writing multiple oplog entries by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55909&quot;&gt;SERVER-55909&lt;/a&gt; for a specific use case - batching large deletions efficiently. It does so by introducing a BatchedWriteContext and plugging the WUOW commit into the OpObserver multi-document transaction commit logic.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;We should unify the BatchedWriteContext and TransactionParticipant replication logic. This may also simplify the work needed for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55909&quot; title=&quot;Prevent a single WUOW from writing multiple oplog entries by default&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55909&quot;&gt;SERVER-55909&lt;/a&gt;.&lt;br/&gt;
Proposal: the TransactionParticipant should be using BatchedWriteContext to store operation state, rather than keeping it as private context on its own type, and then when we&apos;re stashing transactions between statements, we should be stashing the BWC as well. With this approach, we should also be in a position to unify the OpObserverImpl::onUnpreparedTransactionCommit and OpObserverImpl::onBatchedWriteCommit functions.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2001210">SERVER-64506</key>
            <summary>Unify replication back-end of TransactionParticipant and WUOW</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
                            <label>techdebt</label>
                    </labels>
                <created>Tue, 15 Mar 2022 09:27:10 +0000</created>
                <updated>Tue, 6 Dec 2022 00:25:29 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>7</watches>
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            <issuekey id="2115177">SERVER-68860</issuekey>
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            <issuekey id="1674505">SERVER-55909</issuekey>
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            <issuekey id="1972461">SERVER-63047</issuekey>
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