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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47511] Prevent comparison of member indexes from different config versions</title>
                <link>https://jira.mongodb.org/browse/SERVER-47511</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46667&quot; title=&quot;Avoid invariant from invalid candidateIndex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46667&quot;&gt;&lt;del&gt;SERVER-46667&lt;/del&gt;&lt;/a&gt; and other bugs are the result of comparing member indexes from different replica set configs, or using a member index from one config as an array index in a different config.&lt;/p&gt;

&lt;p&gt;Devise a way to avoid repeating these sorts of bugs. Two ideas:&lt;/p&gt;

&lt;p&gt;1. Minimize all use of member indexes from configs, ReplSetMetadata, OplogQueryMetadata, etc. Try to find alternative means of accomplishing the same goals.&lt;br/&gt;
2. Anywhere that member indexes are compared, include the config version and term. Perhaps create a MemberIndex class that has an index, version, and term. Two MemberIndexes cannot be compared unless their versions and terms agree. The name MemberIndex may be too similar to MemberId, so let&apos;s ponder the name.&lt;br/&gt;
3. Hide member indexes behind safe interfaces. E.g., instead of using &lt;tt&gt;OplogQueryMetadata.getSyncSourceIndex()&lt;/tt&gt; directly, create safer methods like &lt;tt&gt;hasSyncSourceIndex()&lt;/tt&gt; or &lt;tt&gt;isSameSyncSourceIndex(MemberIndex i)&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1313441">SERVER-47511</key>
            <summary>Prevent comparison of member indexes from different config versions</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="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="jesse@mongodb.com">A. Jesse Jiryu Davis</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Mon, 13 Apr 2020 19:02:28 +0000</created>
                <updated>Tue, 6 Dec 2022 02:29:57 +0000</updated>
                                                                            <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3042703" author="jesse" created="Thu, 16 Apr 2020 15:24:29 +0000"  >&lt;p&gt;In &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47125&quot; title=&quot;Require ReplSetMetadata.isPrimary, remove OplogQueryMetadata.primaryIndex&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47125&quot;&gt;&lt;del&gt;SERVER-47125&lt;/del&gt;&lt;/a&gt;, I plan to replace OplogQueryMetadata::getPrimaryIndex() with hasPrimaryIndex(). The only information we need is whether the primary index is -1. Changing the accessor method from int to bool prevents future bugs where we try to compare the primary index with a member index from a different config. We should do the same with OplogQueryMetadata::getSyncSourceIndex().&lt;/p&gt;</comment>
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