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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-56112] [SBE] Remove redundant oplog locking in TransactionHistoryIterator::next() path</title>
                <link>https://jira.mongodb.org/browse/SERVER-56112</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When SBE is on, in &lt;tt&gt;TransactionHistoryIterator::next()&lt;/tt&gt; oplog lock is acquired in &lt;tt&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/bcab4816a1731f9773fa2af7fa76ca35bc1fa23d/src/mongo/db/transaction_history_iterator.cpp#L79&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;findOneOplogEntry()&lt;/a&gt;&lt;/tt&gt; and by SBE in &lt;tt&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/bcab4816a1731f9773fa2af7fa76ca35bc1fa23d/src/mongo/db/exec/sbe/stages/collection_helpers.cpp#L51&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;ScanStage&lt;/a&gt;&lt;/tt&gt;. Remove the redundant oplog locking.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1680805">SERVER-56112</key>
            <summary>[SBE] Remove redundant oplog locking in TransactionHistoryIterator::next() path</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="13203">Gone away</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="mindaugas.malinauskas@mongodb.com">Mindaugas Malinauskas</reporter>
                        <labels>
                            <label>sbe-post-v1</label>
                    </labels>
                <created>Thu, 15 Apr 2021 09:06:33 +0000</created>
                <updated>Fri, 27 Oct 2023 20:46:06 +0000</updated>
                            <resolved>Wed, 23 Jun 2021 16:35:45 +0000</resolved>
                                                                    <component>Query Execution</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="3894487" author="david.storch" created="Wed, 23 Jun 2021 16:35:33 +0000"  >&lt;p&gt;The redundant locking described here no longer exists due to the changes made in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57096&quot; title=&quot;[SBE] Nested (non-lock free) AutoGets lead to invariant failure during stepdown&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57096&quot;&gt;&lt;del&gt;SERVER-57096&lt;/del&gt;&lt;/a&gt;. Namely, SBE &lt;tt&gt;PlanExecutors&lt;/tt&gt; now fully require the external lock policy. This means that the caller is required to hold the appropriate locks, and the SBE scan and ixscan stages no longer acquire any locks themselves. Therefore, the &lt;tt&gt;TransactionHistoryIterator&lt;/tt&gt; needs to keep holding the &lt;tt&gt;AutoGetOplog&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Closing this ticket as &quot;Gone Away&quot;.&lt;/p&gt;</comment>
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