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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-54908] Shard servers with 4.9 binary and 4.4 FCV should be able to use secondaryDelaySecs</title>
                <link>https://jira.mongodb.org/browse/SERVER-54908</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&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;</description>
                <environment></environment>
        <key id="1638107">SERVER-54908</key>
            <summary>Shard servers with 4.9 binary and 4.4 FCV should be able to use secondaryDelaySecs</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="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</assignee>
                                    <reporter username="pavithra.vetriselvan@mongodb.com">Pavithra Vetriselvan</reporter>
                        <labels>
                    </labels>
                <created>Wed, 3 Mar 2021 15:01:40 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:48 +0000</updated>
                            <resolved>Mon, 8 Mar 2021 18:36:33 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3650546" author="xgen-internal-githook" created="Fri, 5 Mar 2021 23:34:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Pavi Vetriselvan&apos;, &apos;email&apos;: &apos;pavithra.vetriselvan@mongodb.com&apos;, &apos;username&apos;: &apos;pvselvan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-54908&quot; title=&quot;Shard servers with 4.9 binary and 4.4 FCV should be able to use secondaryDelaySecs&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54908&quot;&gt;&lt;del&gt;SERVER-54908&lt;/del&gt;&lt;/a&gt; Allow new 4.9 shard servers in FCV 4.4 to use secondaryDelaySecs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/179b832e79916c45916eea111417990065fc003d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/179b832e79916c45916eea111417990065fc003d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1651791">DOCS-14300</issuekey>
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                            <customfieldvalue>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;&gt;http://www.mongodb.org/dochub/core/recover-replica-set-from-invalid-config&lt;/a&gt; so it should be updated accordingly.&lt;br/&gt;
&lt;br/&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 &amp;quot;binary: 4.4&amp;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&amp;#39;ll have to do the following:&lt;br/&gt;
- Restart shard with MDB 4.9 (&amp;quot;binary: 4.9&amp;quot;) / FCV 4.4.&lt;br/&gt;
- Reconfig to change &amp;#39;secondaryDelaySecs&amp;#39; to &amp;#39;slaveDelay&amp;#39;.&lt;br/&gt;
- Downgrade shard binary to MDB 4.4 / FCV 4.4 by restarting shard with &amp;quot;binary: 4.4&amp;quot;. The shard server should successfully start up.&lt;br/&gt;
&lt;br/&gt;
Note: This is specific to downgrading to 4.4 from 5.0. </customfieldvalue>

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