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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-34460] Mongos will not pick up database versions for database entries it already has cached after setFCV 4.0</title>
                <link>https://jira.mongodb.org/browse/SERVER-34460</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is because mongos will only refresh an entry it has already cached if it is told the entry is stale.&lt;/p&gt;

&lt;p&gt;However, it will only be told the entry is stale if it receives StaleDbVersion from some shard, which can only happen if it attaches a databaseVersion in the request to the shard (and of course, mongos won&apos;t attach a database version if its cache entry does not have a database version).&lt;/p&gt;</description>
                <environment></environment>
        <key id="526596">SERVER-34460</key>
            <summary>Mongos will not pick up database versions for database entries it already has cached after setFCV 4.0</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Fri, 13 Apr 2018 15:13:08 +0000</created>
                <updated>Fri, 13 Apr 2018 20:28:13 +0000</updated>
                            <resolved>Fri, 13 Apr 2018 20:28:13 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1864175" author="esha.maharishi@10gen.com" created="Fri, 13 Apr 2018 20:27:58 +0000"  >&lt;p&gt;Closing as Won&apos;t Fix. We decided not to handle this in 4.0, since no new features in 4.0 depend on database versioning.&lt;/p&gt;

&lt;p&gt;Database versioning will start working correctly in 4.2, because to upgrade to 4.2, the mongoses must be restarted as v4.2, which clears all of their in-memory state (including the cache of database entries).&lt;/p&gt;

&lt;p&gt;(Note that 4.2 mongoses will always expect database entries to have database versions).&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=schwerin&quot; class=&quot;user-hover&quot; rel=&quot;schwerin&quot;&gt;schwerin&lt;/a&gt;, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kaloian.manassiev&quot; class=&quot;user-hover&quot; rel=&quot;kaloian.manassiev&quot;&gt;kaloian.manassiev&lt;/a&gt;&lt;/p&gt;</comment>
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