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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-26260] downgrade_replset.js and minor_version_downgrade_replset.js can fail due to v:2 index</title>
                <link>https://jira.mongodb.org/browse/SERVER-26260</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;These tests downgrade a replica set after running &lt;tt&gt;setFeatureCompatibiliityVersion:&quot;3.2&quot;&lt;/tt&gt;. The sFCV command returns &quot;ok&quot; after dropping a v:2 index on &lt;tt&gt;admin.system.version&lt;/tt&gt; with &quot;majority&quot; writeConcern. This means that after receiving &quot;ok&quot;, the index drop will not roll back, and all nodes will &lt;em&gt;eventually&lt;/em&gt; become downgrade-able (since a node can only be downgraded until after the v:2 index is dropped). However, not all nodes are immediately downgrade-able. The test can attempt to downgrade a secondary that has not yet applied the dropIndex command. The node fails to start up with an error such as the following:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;[js_test:minor_version_downgrade_replset] 2016-09-22T04:55:49.573+0000 d20011| 2016-09-22T04:55:49.572+0000 F INDEX    [initandlisten] Found an invalid index { v: 2, key: { version: 1 }, name: &quot;incompatible_with_version_32&quot;, ns: &quot;admin.system.version&quot; } on the admin.system.version collection: this version of mongod cannot build new indexes of version number 2&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;In order to fix, the test should wait for the secondaries to catch up to the primary before attempting to downgrade.&lt;/p&gt;

&lt;p&gt;If an operator encounters this situation in practice, the intention is that she or he restarts the node as 3.4 and tries to downgrade again once it has caught up.&lt;/p&gt;</description>
                <environment></environment>
        <key id="318260">SERVER-26260</key>
            <summary>downgrade_replset.js and minor_version_downgrade_replset.js can fail due to v:2 index</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="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Thu, 22 Sep 2016 21:41:55 +0000</created>
                <updated>Sat, 19 Nov 2016 00:06:30 +0000</updated>
                            <resolved>Fri, 23 Sep 2016 20:53:14 +0000</resolved>
                                                    <fixVersion>3.3.15</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1392392" author="xgen-internal-githook" created="Fri, 23 Sep 2016 20:52:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26260&quot; title=&quot;downgrade_replset.js and minor_version_downgrade_replset.js can fail due to v:2 index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26260&quot;&gt;&lt;del&gt;SERVER-26260&lt;/del&gt;&lt;/a&gt; make tests await replication of FCV before downgrade&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2009fc942491098a4bd17001a2278af471e3cb08&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2009fc942491098a4bd17001a2278af471e3cb08&lt;/a&gt;&lt;/p&gt;</comment>
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