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        <build-date>13-04-2023</build-date>
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            <title>[SERVER-79881] Integrate WaitForMajorityService with ReplicationCoordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-79881</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/54857a1fef1e3a38160a0a0b1ef8c93c66ed818b/src/mongo/db/repl/wait_for_majority_service.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WaitForMajorityService&lt;/a&gt; was introduced in 4.4 (in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40785&quot; title=&quot;Improve transaction coordinator startup&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40785&quot;&gt;&lt;del&gt;SERVER-40785&lt;/del&gt;&lt;/a&gt;) to allow asynchronously waiting for majority write concern. The service holds a queue of opTimes to wait for and has a background thread that periodically waits for the lowest time.&lt;/p&gt;

&lt;p&gt;As of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43135&quot; title=&quot;Introduce a future-based API for waiting for write concern&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-43135&quot;&gt;&lt;del&gt;SERVER-43135&lt;/del&gt;&lt;/a&gt;, the ReplicationCoordinator has a futures based API to wait for write concern internally, so it&apos;s possible we can refactor the WaitForMajorityService to use that API. This could simplify the service and likely improve its performance, since the current implementation scales poorly with many requests - see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79785&quot; title=&quot;WaitForMajorityService can be a bottleneck for two phase commit transactions&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79785&quot;&gt;&lt;del&gt;SERVER-79785&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2413244">SERVER-79881</key>
            <summary>Integrate WaitForMajorityService with ReplicationCoordinator</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="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="scott.li@mongodb.com">Scott Li</assignee>
                                    <reporter username="jack.mulrow@mongodb.com">Jack Mulrow</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                            <label>repl-shortlist</label>
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                <created>Wed, 9 Aug 2023 15:57:51 +0000</created>
                <updated>Mon, 5 Feb 2024 17:15:49 +0000</updated>
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