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    <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-48170] Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-48170</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;tt&gt;Sharding.prototype.upgradeCluster()&lt;/tt&gt; and the related &lt;tt&gt;ReplSetTest.prototype.upgradeSet()&lt;/tt&gt; functions &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7ee768a17cbc78f42c8e8938df2c68635f871bdf/jstests/multiVersion/libs/multi_rs.js#L125-L127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;assert the node which was originally primary before the replica set was being upgrading is still the current primary when trying to step it down&lt;/a&gt;. In a 2-node replica set where both members have a vote, the voting-majority is defined as both members. This means while the secondary is being restarted, the primary may end up stepping down (due to heartbeats not being received) and for the restarted node to run for and win the election. (Configuring a high election timeout or adding a third member to the replica sets are other ways to avoid this issue.)&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;ReplSetTest.prototype.upgradePrimary()&lt;/tt&gt; function already has a concept of &quot;no downtime possible&quot;&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;We should &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7ee768a17cbc78f42c8e8938df2c68635f871bdf/jstests/multiVersion/libs/multi_rs.js#L71&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;plumb &lt;tt&gt;noDowntimePossible&lt;/tt&gt; into &lt;tt&gt;ReplSetTest.prototype.stepdown()&lt;/tt&gt;&lt;/a&gt; to have it skip &lt;a href=&quot;https://github.com/mongodb/mongo/blob/7ee768a17cbc78f42c8e8938df2c68635f871bdf/jstests/multiVersion/libs/multi_rs.js#L127&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this assertion&lt;/a&gt; when &lt;tt&gt;noDowntimePossible === false&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1349065">SERVER-48170</key>
            <summary>Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards</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="tommaso.tocci@mongodb.com">Tommaso Tocci</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                            <label>sharding-wfbf-day</label>
                    </labels>
                <created>Tue, 12 May 2020 22:42:19 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:17 +0000</updated>
                            <resolved>Fri, 2 Oct 2020 14:45:14 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                    <fixVersion>4.4.2</fixVersion>
                                    <component>Testing Infrastructure</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3424079" author="xgen-internal-githook" created="Sat, 3 Oct 2020 06:49:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48170&quot; title=&quot;Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48170&quot;&gt;&lt;del&gt;SERVER-48170&lt;/del&gt;&lt;/a&gt; Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 478bf480ebfad1ab6fee19cb9a199071115f42c8)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c9cb7ecc844b1ea3b14db4afcb8edaedb5a337ce&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c9cb7ecc844b1ea3b14db4afcb8edaedb5a337ce&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3422914" author="xgen-internal-githook" created="Fri, 2 Oct 2020 14:19:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48170&quot; title=&quot;Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48170&quot;&gt;&lt;del&gt;SERVER-48170&lt;/del&gt;&lt;/a&gt; Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/478bf480ebfad1ab6fee19cb9a199071115f42c8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/478bf480ebfad1ab6fee19cb9a199071115f42c8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3422503" author="xgen-internal-githook" created="Fri, 2 Oct 2020 10:37:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48170&quot; title=&quot;Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48170&quot;&gt;&lt;del&gt;SERVER-48170&lt;/del&gt;&lt;/a&gt; Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 8be28ffc901d981b96fff2f378faed007de95e52.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/49e617b554b2c6c144f29c1f3e97d49e4e1a6944&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/49e617b554b2c6c144f29c1f3e97d49e4e1a6944&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3422463" author="tommaso.tocci" created="Fri, 2 Oct 2020 09:38:17 +0000"  >&lt;p&gt;Reverting it because it is causing several failures&lt;/p&gt;</comment>
                            <comment id="3422419" author="xgen-internal-githook" created="Fri, 2 Oct 2020 08:49:07 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tommaso Tocci&apos;, &apos;email&apos;: &apos;tommaso.tocci@mongodb.com&apos;, &apos;username&apos;: &apos;toto-dev&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-48170&quot; title=&quot;Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-48170&quot;&gt;&lt;del&gt;SERVER-48170&lt;/del&gt;&lt;/a&gt; Multiversion tests assume primary stability when using upgradeCluster() with 2-node replica set shards&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8be28ffc901d981b96fff2f378faed007de95e52&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8be28ffc901d981b96fff2f378faed007de95e52&lt;/a&gt;&lt;/p&gt;</comment>
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