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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-27125] Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate</title>
                <link>https://jira.mongodb.org/browse/SERVER-27125</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently in pv1, the use of arbiters can result in unnecessary flapping during certain kinds of network partitions.  Imagine a 3 node replica set with 2 data bearing members and 1 arbiter.  If the data bearing members become isolated from each other, but the arbiter can see both, then whichever node is not primary will call for an election and win, the arbiter will transmit the term change to the old primary, which will step down, and then a few seconds later it will call for a new election, which it too shall win, on and on.  You wind up with the primary changing every few seconds.  Implementing this ticket will prevent that scenario, at the cost of slower failovers for &lt;b&gt;all&lt;/b&gt; failovers when using arbiters.&lt;/p&gt;</description>
                <environment></environment>
        <key id="333037">SERVER-27125</key>
            <summary>Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate</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="9">Done</resolution>
                                        <assignee username="jack.mulrow@mongodb.com">Jack Mulrow</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Nov 2016 23:48:11 +0000</created>
                <updated>Wed, 27 Sep 2017 17:09:07 +0000</updated>
                            <resolved>Wed, 25 Jan 2017 01:08:37 +0000</resolved>
                                                    <fixVersion>3.2.12</fixVersion>
                    <fixVersion>3.4.2</fixVersion>
                    <fixVersion>3.5.2</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>14</watches>
                                                                                                                <comments>
                            <comment id="1484991" author="xgen-internal-githook" created="Wed, 25 Jan 2017 16:05:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27125&quot; title=&quot;Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27125&quot;&gt;&lt;del&gt;SERVER-27125&lt;/del&gt;&lt;/a&gt; Arbiters in PV1 vote no if they can see a healthy primary of equal or greater priority to the candidate&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97718a410d3d40f5c3f01dfae76e7ddd910897af)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ef3e1bc78e997f0d9f22f45aeb1d8e3b6ac14a14&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ef3e1bc78e997f0d9f22f45aeb1d8e3b6ac14a14&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1484549" author="xgen-internal-githook" created="Wed, 25 Jan 2017 00:54:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27125&quot; title=&quot;Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27125&quot;&gt;&lt;del&gt;SERVER-27125&lt;/del&gt;&lt;/a&gt; Arbiters in PV1 vote no if they can see a healthy primary of equal or greater priority to the candidate&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 97718a410d3d40f5c3f01dfae76e7ddd910897af)&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd491eeb54933e88361658ca7d589126397bd289&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd491eeb54933e88361658ca7d589126397bd289&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1484446" author="xgen-internal-githook" created="Tue, 24 Jan 2017 22:41:47 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27125&quot; title=&quot;Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27125&quot;&gt;&lt;del&gt;SERVER-27125&lt;/del&gt;&lt;/a&gt; Arbiters in PV1 vote no if they can see a healthy primary of equal or greater priority to the candidate&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/97718a410d3d40f5c3f01dfae76e7ddd910897af&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/97718a410d3d40f5c3f01dfae76e7ddd910897af&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1483417" author="siyuan.zhou@10gen.com" created="Tue, 24 Jan 2017 00:51:01 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jack.mulrow&quot; class=&quot;user-hover&quot; rel=&quot;jack.mulrow&quot;&gt;jack.mulrow&lt;/a&gt;, I reverted this commit since it failed on replicasets_legacy test suite.&lt;/p&gt;</comment>
                            <comment id="1483416" author="xgen-internal-githook" created="Tue, 24 Jan 2017 00:49:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;visualzhou&apos;, u&apos;name&apos;: u&apos;Siyuan Zhou&apos;, u&apos;email&apos;: u&apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27125&quot; title=&quot;Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27125&quot;&gt;&lt;del&gt;SERVER-27125&lt;/del&gt;&lt;/a&gt; Arbiters in PV1 vote no if they can see a healthy primary of equal or greater priority to the candidate&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit eef6335bbc0eedeb6f50120164ca0f198fb94303.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c169d7bfd38abb845dfa5369a43781742d957d72&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c169d7bfd38abb845dfa5369a43781742d957d72&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1483095" author="xgen-internal-githook" created="Mon, 23 Jan 2017 21:13:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jsmulrow&apos;, u&apos;name&apos;: u&apos;Jack Mulrow&apos;, u&apos;email&apos;: u&apos;jack.mulrow@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-27125&quot; title=&quot;Arbiters in pv1 should vote no in elections if they can see a healthy primary of equal or greater priority to the candidate&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-27125&quot;&gt;&lt;del&gt;SERVER-27125&lt;/del&gt;&lt;/a&gt; Arbiters in PV1 vote no if they can see a healthy primary of equal or greater priority to the candidate&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/eef6335bbc0eedeb6f50120164ca0f198fb94303&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/eef6335bbc0eedeb6f50120164ca0f198fb94303&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1440192" author="milkie" created="Tue, 22 Nov 2016 16:21:34 +0000"  >&lt;p&gt;It should work, but it will increase failover time.  That can be solved via documentation, however.&lt;/p&gt;</comment>
                            <comment id="1440158" author="spencer" created="Tue, 22 Nov 2016 15:58:08 +0000"  >&lt;p&gt;&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; - I updated the title to account for priorities - does that sound safe to you now?&lt;/p&gt;</comment>
                            <comment id="1438934" author="milkie" created="Mon, 21 Nov 2016 13:31:19 +0000"  >&lt;p&gt;I think this will mess up priority takeover in 3 node sets.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="325758">SERVER-26717</issuekey>
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                                        <issuelink>
            <issuekey id="350417">SERVER-27861</issuekey>
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            <issuekey id="433249">SERVER-31274</issuekey>
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