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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-54829] Stepdown can interrupt setFCV before reconfig completes</title>
                <link>https://jira.mongodb.org/browse/SERVER-54829</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When setting the FCV to 4.4 from 4.9, we first &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fec9518d618512254f61afa94129241874eb7b19/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L373-L380&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;update to the FCV document&lt;/a&gt;, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fec9518d618512254f61afa94129241874eb7b19/src/mongo/db/commands/feature_compatibility_version.cpp#L138-L140&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;sets the targetVersion to 4.4&lt;/a&gt;. Before we complete the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/fec9518d618512254f61afa94129241874eb7b19/src/mongo/db/commands/set_feature_compatibility_version_command.cpp#L400&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reconfig&lt;/a&gt; to change `secondaryDelaySecs` back to `slaveDelay` in the replica set config, stepdown can interrupt the setFCV command. This means that the FCV is effectively 4.4, but the replica set config contains `secondaryDelaySecs` instead of `slaveDelay`. If the node steps back up again (or another node that also has FCV set to 4.4 steps up), then the associated reconfig will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/35a6a97338930d75a7f5cfd89671ae9af65aaf85/src/mongo/db/repl/repl_set_config_checks.cpp#L123-L143&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fassert because the config is invalid&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1634895">SERVER-54829</key>
            <summary>Stepdown can interrupt setFCV before reconfig completes</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="samy.lanka@mongodb.com">Samyukta Lanka</reporter>
                        <labels>
                            <label>sharding-csrs-stepdown-only</label>
                    </labels>
                <created>Fri, 26 Feb 2021 18:50:50 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:57 +0000</updated>
                            <resolved>Thu, 8 Apr 2021 18:14:00 +0000</resolved>
                                                    <fixVersion>4.9.0-rc1</fixVersion>
                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="3727936" author="xgen-internal-githook" created="Tue, 20 Apr 2021 15:44:18 +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-54829&quot; title=&quot;Stepdown can interrupt setFCV before reconfig completes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54829&quot;&gt;&lt;del&gt;SERVER-54829&lt;/del&gt;&lt;/a&gt; Avoid crashing during kUpgrading/kDowngrading state if config has incompatible field name&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f1ac83b03c330d1ef59dd13e55aeddf3c6d41b4b)&lt;br/&gt;
Branch: v4.9&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e71e821acd084d3010b59bb65a2d82ef7a7fdba4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e71e821acd084d3010b59bb65a2d82ef7a7fdba4&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3727935" author="xgen-internal-githook" created="Tue, 20 Apr 2021 15:44:16 +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-54829&quot; title=&quot;Stepdown can interrupt setFCV before reconfig completes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54829&quot;&gt;&lt;del&gt;SERVER-54829&lt;/del&gt;&lt;/a&gt; consolidate validateConfigForReconfig paths into a single one&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f3a6c48b49f8c66d2442bc6e5061129b00b85fef)&lt;br/&gt;
Branch: v4.9&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/be75f9d33d8cb3c258fbd375a3fb1861dd9af93c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/be75f9d33d8cb3c258fbd375a3fb1861dd9af93c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3708612" author="xgen-internal-githook" created="Thu, 8 Apr 2021 18:26:02 +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-54829&quot; title=&quot;Stepdown can interrupt setFCV before reconfig completes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54829&quot;&gt;&lt;del&gt;SERVER-54829&lt;/del&gt;&lt;/a&gt; Avoid crashing during kUpgrading/kDowngrading state if config has incompatible field name&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f1ac83b03c330d1ef59dd13e55aeddf3c6d41b4b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f1ac83b03c330d1ef59dd13e55aeddf3c6d41b4b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3698754" author="xgen-internal-githook" created="Fri, 2 Apr 2021 15:39:45 +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-54829&quot; title=&quot;Stepdown can interrupt setFCV before reconfig completes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-54829&quot;&gt;&lt;del&gt;SERVER-54829&lt;/del&gt;&lt;/a&gt; consolidate validateConfigForReconfig paths into a single one&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f3a6c48b49f8c66d2442bc6e5061129b00b85fef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f3a6c48b49f8c66d2442bc6e5061129b00b85fef&lt;/a&gt;&lt;/p&gt;</comment>
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