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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-38754] Add optimizations for change streams using speculative majority</title>
                <link>https://jira.mongodb.org/browse/SERVER-38754</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We want to add optimizations for change stream queries using speculative majority to reduce unnecessary waiting. These optimizations include waiting on the most recent scanned timestamp in an oplog batch as opposed to waiting on the most recent system-wide lastApplied optime. Such optimizations are only permissible if an updateLookup query is not being done locally on the node in addition to an oplog read.&lt;/p&gt;</description>
                <environment></environment>
        <key id="660315">SERVER-38754</key>
            <summary>Add optimizations for change streams using speculative majority</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="william.schultz@mongodb.com">William Schultz</assignee>
                                    <reporter username="william.schultz@mongodb.com">William Schultz</reporter>
                        <labels>
                    </labels>
                <created>Fri, 21 Dec 2018 21:52:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:25:28 +0000</updated>
                            <resolved>Wed, 23 Jan 2019 19:41:03 +0000</resolved>
                                                    <fixVersion>4.1.8</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="2124631" author="xgen-internal-githook" created="Wed, 23 Jan 2019 19:39:31 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;william.schultz@mongodb.com&apos;, &apos;name&apos;: &apos;William Schultz&apos;, &apos;username&apos;: &apos;will62794&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-38754&quot; title=&quot;Add optimizations for change streams using speculative majority&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-38754&quot;&gt;&lt;del&gt;SERVER-38754&lt;/del&gt;&lt;/a&gt; Make speculative majority change stream reads wait on optimized optimes&lt;/p&gt;

&lt;p&gt;Speculative majority change stream oplog reads now only wait on the latest scanned oplog timestamp when possible, as opposed to always waiting on the latest system-wide lastApplied optime. If a document post-image lookup occurs locally for a change stream read, then this optimization is not safe, since the document lookup may reflect data at some unknown timestamp. In this case, we revert to waiting on the node&apos;s lastApplied optime.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ffb19c17927a5a0a07a7cd7cd7744cea80ab3e26&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ffb19c17927a5a0a07a7cd7cd7744cea80ab3e26&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="616765">SERVER-37560</issuekey>
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