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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-30515] disallow initiating cluster FCV downgrade in the middle of upgrade (and vice versa)</title>
                <link>https://jira.mongodb.org/browse/SERVER-30515</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;we can do this by checking the &lt;tt&gt;targetVersion&lt;/tt&gt; on the config server at the beginning of configsvrSetFCV&lt;/p&gt;

&lt;p&gt;if push comes to shove, you will be able to manually change the &lt;tt&gt;version&lt;/tt&gt; and &lt;tt&gt;targetVersion&lt;/tt&gt; fields in the featureCompatibilityVersion document to allow initiating downgrade in the middle of upgrade (and vice versa)&lt;/p&gt;

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

&lt;p&gt;this is to prevent the following case:&lt;/p&gt;

&lt;p&gt;the config server&apos;s configsvrSetFCV sends setFCV to all shards.&lt;/p&gt;

&lt;p&gt;if multiple configsvrSetFCV&apos;s were allowed to run concurrently (and were trying to set different versions), their setFCV&apos;s to shards could be interleaved, leaving shards with inconsistent FCVs, though both configsvrSetFCV calls return success. to protect against this, we can allow only one configsvrSetFCV to run at a time.&lt;/p&gt;

&lt;p&gt;however, if the config server fails over during a configsvrSetFCV, its setFCV calls to shards may still be in flight. a follow-up configsvrSetFCV&apos;s setFCV calls to shards can then still race with the in-flight setFCV calls from the first configsvrSetFCV.&lt;/p&gt;</description>
                <environment></environment>
        <key id="412591">SERVER-30515</key>
            <summary>disallow initiating cluster FCV downgrade in the middle of upgrade (and vice versa)</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="3">Duplicate</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 3 Aug 2017 22:11:48 +0000</created>
                <updated>Mon, 2 Oct 2017 20:03:28 +0000</updated>
                            <resolved>Mon, 2 Oct 2017 20:03:28 +0000</resolved>
                                    <version>3.5.11</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1686982" author="esha.maharishi@10gen.com" created="Mon, 2 Oct 2017 20:03:28 +0000"  >&lt;p&gt;Will be fixed as part of &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30793&quot; title=&quot;merge setFeatureCompatibilityVersion and _configsvrSetFeatureCompatibilityVersion&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30793&quot;&gt;&lt;del&gt;SERVER-30793&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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