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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>[DOCS-14300] Investigate changes in SERVER-54908: Shard servers with 4.9 binary and 4.4 FCV should be able to use secondaryDelaySecs</title>
                <link>https://jira.mongodb.org/browse/DOCS-14300</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

    &lt;div class=&quot;panel&quot; style=&quot;background-color: #c2d2c2;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;background-color: #239eb0;&quot;&gt;&lt;b&gt;Downstream Change Summary&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #c2d2c2;&quot;&gt;
&lt;p&gt;    We should document the manual downgrade procedure for a shard server binary that attempted to downgrade to 4.4 with the secondaryDelaySecs field still present. We point users to this link: &lt;a href=&quot;http://www.mongodb.org/dochub/core/recover-replica-set-from-invalid-config&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/dochub/core/recover-replica-set-from-invalid-config&lt;/a&gt; so it should be updated accordingly.&lt;/p&gt;

&lt;p&gt;The test goes through the following procedure:&lt;br/&gt;
1. Start up a shard server process with MDB 4.9 / FCV (featureCompatibilityVersion) 4.4 (note: new shard servers will default to the last-LTS FCV until they are added to a sharded cluster via addShard)&lt;br/&gt;
2. Call rs.init() with secondaryDelaySecs in the replica set config.&lt;br/&gt;
3. Downgrade shard binary to MDB 4.4 / FCV 4.4 by stopping the shard server and restarting with &quot;binary: 4.4&quot;. During this step, the shard server will refuse to start up because it sees an unrecognized field (secondaryDelaySecs). In order for the user to get out of this situation, they&apos;ll have to do the following:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Restart shard with MDB 4.9 (&quot;binary: 4.9&quot;) / FCV 4.4.&lt;/li&gt;
	&lt;li&gt;Reconfig to change &apos;secondaryDelaySecs&apos; to &apos;slaveDelay&apos;.&lt;/li&gt;
	&lt;li&gt;Downgrade shard binary to MDB 4.4 / FCV 4.4 by restarting shard with &quot;binary: 4.4&quot;. The shard server should successfully start up.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Note: This is specific to downgrading to 4.4 from 5.0. &lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;

&lt;h2&gt;&lt;a name=&quot;DescriptionofLinkedTicket&quot;&gt;&lt;/a&gt;Description of Linked Ticket&lt;/h2&gt;
&lt;p&gt;    New 4.9 shard servers use the default 4.4 FCV, and therefore reject &lt;tt&gt;secondaryDelaySecs&lt;/tt&gt;, until either:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;they are added to a cluster with 4.9 FCV (via addShard)&lt;/li&gt;
	&lt;li&gt;they are added to a cluster with 4.4 FCV and the FCV is then set to 4.9 for the entire cluster via mongos&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;During this period, we should allow shard servers to initialize with &lt;tt&gt;secondaryDelaySecs&lt;/tt&gt; since they are using the 4.9 binary.&lt;/p&gt;


&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="1651791">DOCS-14300</key>
            <summary>Investigate changes in SERVER-54908: Shard servers with 4.9 binary and 4.4 FCV should be able to use secondaryDelaySecs</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="backlog-server-pm">Backlog - Core Eng Program Management Team</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 Mar 2021 21:02:17 +0000</created>
                <updated>Mon, 13 Nov 2023 17:56:49 +0000</updated>
                                                            <fixVersion>4.9.0</fixVersion>
                    <fixVersion>Server_Docs_20231030</fixVersion>
                    <fixVersion>Server_Docs_20231106</fixVersion>
                    <fixVersion>Server_Docs_20231105</fixVersion>
                    <fixVersion>Server_Docs_20231113</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due>Fri, 28 May 2021 00:00:00 +0000</due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4940339" author="edu.bot" created="Mon, 31 Oct 2022 16:03:53 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                    </comments>
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