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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-35420] Remove stable optime candidates list from ReplicationCoordinator</title>
                <link>https://jira.mongodb.org/browse/SERVER-35420</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Once we are allowed to do PIT reads on secondaries that fall in the middle of previous secondary application batches, we&apos;ll be able to get rid of ReplicationCoordinatorImpl::_stableOpTimeCandidates.  At that point the stable timestamp can simply be the min of the lastApplied optime on this node and the replication majority commit point.&lt;/p&gt;</description>
                <environment></environment>
        <key id="554682">SERVER-35420</key>
            <summary>Remove stable optime candidates list from ReplicationCoordinator</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Tue, 5 Jun 2018 20:18:57 +0000</created>
                <updated>Tue, 6 Dec 2022 03:27:28 +0000</updated>
                            <resolved>Tue, 22 Jan 2019 21:20:00 +0000</resolved>
                                                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2699340" author="tess.avitabile" created="Thu, 2 Jan 2020 20:39:19 +0000"  >&lt;p&gt;I believe we also need this list for sets with &lt;tt&gt;enableMajorityReadConcern:false&lt;/tt&gt;. Once we remove that option, I would be interested in exploring removing the candidates list. I think it would be worth testing the perf impact.&lt;/p&gt;</comment>
                            <comment id="2699320" author="judah.schvimer" created="Thu, 2 Jan 2020 20:28:27 +0000"  >&lt;p&gt;From conversation with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt; on the initial sync semantics design: I think we still have candidates for replica sets with only one voting node. The replication commit point can advance ahead of the all_durable timestamp, but the stable timestamp must be less than or equal to the all_durable timestamp. all_durable is not guaranteed to be a timestamp in the oplog, but the stable timestamp must be a timestamp in the oplog. The candidate list is a lot of complexity for what I&apos;d consider an edge case. I think we could make sets with a single voting node hold the replication commit point behind the all_durable timestamp and remove the candidates list. This would add a perf penalty in that edge case, but that&apos;s almost certainly worth the complexity removal and the perf penalty of maintaining the candidates list.&lt;/p&gt;

&lt;p&gt;Looking in the codebase I no longer see any places where we use the candidate list outside of choosing the stable timestamp, so I think it is worth considering removing it in the future.&lt;/p&gt;</comment>
                            <comment id="2123361" author="greg.mckeon" created="Tue, 22 Jan 2019 21:20:00 +0000"  >&lt;p&gt;We now use this list in several places, so we&apos;re leaving it.&lt;/p&gt;</comment>
                            <comment id="2015652" author="judah.schvimer" created="Wed, 26 Sep 2018 22:00:48 +0000"  >&lt;p&gt;This probably has to be the lesser of the &quot;all committed&quot; timestamp and the &quot;majority commit point&quot;, but we must be careful because the &quot;all committed&quot; timestamp can be a timestamp that&apos;s not in the oplog, which is not a valid &quot;stable timestamp&quot;. &lt;/p&gt;</comment>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="527353">SERVER-34489</issuekey>
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                                        <issuelink>
            <issuekey id="552779">SERVER-35344</issuekey>
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            <issuelink>
            <issuekey id="562235">SERVER-35714</issuekey>
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