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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-57262] Allow nodes to vote for candidates with higher config</title>
                <link>https://jira.mongodb.org/browse/SERVER-57262</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently we only allow voting for candidates with &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cd16c8abae3e6afc7bd4a8257a4359df5b4fdd64/src/mongo/db/repl/topology_coordinator.cpp#L3266-L3269&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;same config&lt;/a&gt; as ours, due to the issue stated in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46387&quot; title=&quot;Only vote for candidate with same config version and term as self&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46387&quot;&gt;&lt;del&gt;SERVER-46387&lt;/del&gt;&lt;/a&gt;.&#160; However this causes a liveness issue where if a primary is stuck in catchup/drain mode with a lower config, catchup takeover cannot bail it out because catchup takeover requires vote from primary and primary &lt;a href=&quot;https://github.com/mongodb/mongo/blob/cd16c8abae3e6afc7bd4a8257a4359df5b4fdd64/src/mongo/db/repl/replication_coordinator_impl.cpp#L5426-L5435&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;cannot install a new config during catchup/drain mode&lt;/a&gt;. If that happens, the whole replica set will hang because there will be no writable primary. It should be safe to allow voting for candidates with higher config as we used to do, which was also verified by TLA+, but we need to take care of the issue stated in&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46387&quot; title=&quot;Only vote for candidate with same config version and term as self&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46387&quot;&gt;&lt;del&gt;SERVER-46387&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1759532">SERVER-57262</key>
            <summary>Allow nodes to vote for candidates with higher config</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="wenbin.zhu@mongodb.com">Wenbin Zhu</assignee>
                                    <reporter username="ali.mir@mongodb.com">Ali Mir</reporter>
                        <labels>
                    </labels>
                <created>Thu, 27 May 2021 15:00:08 +0000</created>
                <updated>Sun, 29 Oct 2023 21:53:00 +0000</updated>
                            <resolved>Mon, 2 Aug 2021 20:54:52 +0000</resolved>
                                                    <fixVersion>5.0.3</fixVersion>
                    <fixVersion>4.4.9</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="4107506" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:28:28 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3995830" author="xgen-internal-githook" created="Wed, 11 Aug 2021 19:00:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57262&quot; title=&quot;Allow nodes to vote for candidates with higher config&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57262&quot;&gt;&lt;del&gt;SERVER-57262&lt;/del&gt;&lt;/a&gt; Relax vote constraint to allow voting for candidates with newer config.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e7937256045a2a182c583c7aacaf168e02cf0d06)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d21efd2cc4ac16693589f4d7da1cf229c4d08b8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d21efd2cc4ac16693589f4d7da1cf229c4d08b8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3989333" author="xgen-internal-githook" created="Mon, 9 Aug 2021 18:32:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57262&quot; title=&quot;Allow nodes to vote for candidates with higher config&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57262&quot;&gt;&lt;del&gt;SERVER-57262&lt;/del&gt;&lt;/a&gt; Relax vote constraint to allow voting for candidates with newer config.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit e7937256045a2a182c583c7aacaf168e02cf0d06)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/50b33ca04022dc97b54b379dd89e38593032868b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/50b33ca04022dc97b54b379dd89e38593032868b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3976611" author="xgen-internal-githook" created="Mon, 2 Aug 2021 20:39:57 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Wenbin Zhu&apos;, &apos;email&apos;: &apos;wenbin.zhu@mongodb.com&apos;, &apos;username&apos;: &apos;WenbinZhu&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-57262&quot; title=&quot;Allow nodes to vote for candidates with higher config&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-57262&quot;&gt;&lt;del&gt;SERVER-57262&lt;/del&gt;&lt;/a&gt; Relax vote constraint to allow voting for candidates with newer config.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e7937256045a2a182c583c7aacaf168e02cf0d06&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e7937256045a2a182c583c7aacaf168e02cf0d06&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3963922" author="JIRAUSER1258790" created="Mon, 26 Jul 2021 20:12:37 +0000"  >&lt;p&gt;Updating title and description.&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="1837103">SERVER-58988</issuekey>
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            <issuekey id="1834922">SERVER-58939</issuekey>
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