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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-31671] Cancel running elections if the term changes after writing my last vote</title>
                <link>https://jira.mongodb.org/browse/SERVER-31671</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In the real election, the term of dry run election should be used rather than &lt;a href=&quot;https://github.com/mongodb/mongo/blob/367d31e1da549c460ae710a8cc280f4c235ab24f/src/mongo/db/repl/replication_coordinator_impl_elect_v1.cpp#L256&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the term in topology coordinator&lt;/a&gt; because the latter can be updated if another node is also running election. It should be the same one we pass into _onVoteRequestComplete(). Alternatively, we can double check the term is the still same before the real election.&lt;/p&gt;
</description>
                <environment></environment>
        <key id="448925">SERVER-31671</key>
            <summary>Cancel running elections if the term changes after writing my last vote</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                    </labels>
                <created>Sat, 21 Oct 2017 02:57:57 +0000</created>
                <updated>Mon, 30 Oct 2023 23:12:35 +0000</updated>
                            <resolved>Tue, 7 Nov 2017 21:42:08 +0000</resolved>
                                                    <fixVersion>3.4.14</fixVersion>
                    <fixVersion>3.6.0-rc4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1815012" author="xgen-internal-githook" created="Sat, 24 Feb 2018 00:03:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31671&quot; title=&quot;Cancel running elections if the term changes after writing my last vote&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31671&quot;&gt;&lt;del&gt;SERVER-31671&lt;/del&gt;&lt;/a&gt; Cancel running elections if the term changes after writing my last vote&lt;/p&gt;

&lt;p&gt;(cherry picked from commit c8fbc9a23152d707541a5c03c6af0eedb9a83bf9)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5b67d13f3a5c44ea677de10bea9c871a246ca619&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5b67d13f3a5c44ea677de10bea9c871a246ca619&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1719831" author="xgen-internal-githook" created="Tue, 7 Nov 2017 21:41:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;username&apos;: &apos;visualzhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-31671&quot; title=&quot;Cancel running elections if the term changes after writing my last vote&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-31671&quot;&gt;&lt;del&gt;SERVER-31671&lt;/del&gt;&lt;/a&gt; Cancel running elections if the term changes after writing my last vote&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c8fbc9a23152d707541a5c03c6af0eedb9a83bf9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c8fbc9a23152d707541a5c03c6af0eedb9a83bf9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1706371" author="siyuan.zhou@10gen.com" created="Mon, 23 Oct 2017 17:33:27 +0000"  >&lt;p&gt;It&apos;s more of a bug in my opinion, but not a harmful one according to how we handle term change. The candidate may run the real election in a higher term (the term used by VoteRequestor) but want to become primary in a lower term (the term passed in _onVoteRequestComplete). We have a safe guard in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/59cedee3230235f444e5f3675260e36095527158/src/mongo/db/repl/replication_coordinator_impl_elect_v1.cpp#L273&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_onVoteRequestComplete&lt;/a&gt; to check the term change, which masked this issue.&lt;/p&gt;</comment>
                            <comment id="1705692" author="schwerin" created="Sun, 22 Oct 2017 20:11:25 +0000"  >&lt;p&gt;This is a performance optimization, based on the assumption that the term change indicates another candidate has arrived, and that said candidate is likely to win?&lt;/p&gt;</comment>
                    </comments>
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