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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <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-42994] Minimize and move tryToGoLiveAsASecondary</title>
                <link>https://jira.mongodb.org/browse/SERVER-42994</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This free function in sync_tail.cpp is called several layers deep in the oplog application code. It is called before applying each batch, and it attempts to transition the member state to SECONDARY by calling several ReplicationCoordinator methods. I think the member state is typically RECOVERING or SECONDARY when this function is called.&lt;/p&gt;

&lt;p&gt;Judah theorizes that this function is practically obsolete and is typically a no-op, except in enableMajorityReadConcern false mode, where we do rollback via refetch. (Note from Jesse: yes this seems to be true. There&apos;s also forceRollbackViaRefetch but it can be removed, &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-41931&quot; title=&quot;Remove forceRollbackViaRefetch flag&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-41931&quot;&gt;SERVER-41931&lt;/a&gt;.)&lt;/p&gt;

&lt;p&gt;Changing member state should be the responsibility of the ReplicationCoordinator, not SyncTail. Remove obsolete code from tryToGoLiveAsASecondary(), then convert it to a method in the ReplicationCoordinator. If possible, reverse control: the ReplicationCoordinator should trigger changes in oplog application after it decides to become a secondary, not vice-versa. However, it may not be possible: ReplicationCoordinator needs the applier to signal it when it is the right time to transition its state, just like signalDrainComplete, where we transition to Primary. If it&apos;s not possible to reverse control this way, then at least the code will be moved to the right class.&lt;/p&gt;</description>
                <environment></environment>
        <key id="904791">SERVER-42994</key>
            <summary>Minimize and move tryToGoLiveAsASecondary</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="13201">Fixed</resolution>
                                        <assignee username="jesse@mongodb.com">A. Jesse Jiryu Davis</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                    </labels>
                <created>Fri, 23 Aug 2019 14:18:46 +0000</created>
                <updated>Sun, 29 Oct 2023 22:17:45 +0000</updated>
                            <resolved>Fri, 13 Sep 2019 01:40:39 +0000</resolved>
                                                    <fixVersion>4.3.1</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2418838" author="xgen-internal-githook" created="Thu, 12 Sep 2019 22:13:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42994&quot; title=&quot;Minimize and move tryToGoLiveAsASecondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42994&quot;&gt;&lt;del&gt;SERVER-42994&lt;/del&gt;&lt;/a&gt; Add finishRecoveryIfEligible to ReplCoordinator&lt;/p&gt;

&lt;p&gt;This logic was in a free function tryToGoLiveAsASecondary in sync_tail.cpp, but belongs with other&lt;br/&gt;
state-change methods on ReplicationCoordinator.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6922691bee2575455d666b5d6d13ff73fc315c53&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6922691bee2575455d666b5d6d13ff73fc315c53&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2418761" author="xgen-internal-githook" created="Thu, 12 Sep 2019 21:25:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;ajdavis&apos;, &apos;email&apos;: &apos;jesse@mongodb.com&apos;, &apos;name&apos;: &apos;A. Jesse Jiryu Davis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42994&quot; title=&quot;Minimize and move tryToGoLiveAsASecondary&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42994&quot;&gt;&lt;del&gt;SERVER-42994&lt;/del&gt;&lt;/a&gt; Add finishRecoveryIfEligible to ReplCoordinatorNoOp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/80f1ab4a271fc09e903d5bfe2e70b878c1729711&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/80f1ab4a271fc09e903d5bfe2e70b878c1729711&lt;/a&gt;&lt;/p&gt;</comment>
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