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    <title>MongoDB Jira</title>
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    <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-40010] Shard secondaries with 4.0 binary and 3.6 FCV are calling `_flushDatabaseCacheUpdates` </title>
                <link>https://jira.mongodb.org/browse/SERVER-40010</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, shard secondaries with 4.0 binary and 3.6 FCV call `_flushDatabaseCacheUpdates` against the primary node. This is wrong because the primary might be running a 3.6 binary, which doesn&apos;t have this command. As a result, in partial-upgrade cases, where a secondary node is on 4.0 and the primary is on 3.6 (with FCV 3.6), queries against the secondary will always fail with an error saying &quot;CommandNotFound: no such command: &apos;_flushDatabaseCacheUpdates&apos;&quot;.&lt;/p&gt;

&lt;p&gt;For some context:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;3.6 - introduced the versioned secondary reads and the &lt;tt&gt;forceRoutingTableRefresh/_flushRoutingTableCacheUpdates&lt;/tt&gt; commands&lt;/li&gt;
	&lt;li&gt;4.0 - introduced the database version concept, which ensures that all commands which read/write database and collection metadata are routed appropriately after a &lt;tt&gt;movePrimary&lt;/tt&gt; or drop/recreate. This logic introduced the &lt;tt&gt;_flushDatabaseCacheUpdates&lt;/tt&gt; command, which is only on 4.0, but is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r4.0.6/src/mongo/db/s/shard_server_catalog_cache_loader.cpp#L313&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unconditionally called&lt;/a&gt; if the catalog cache is accessed on a secondary node.&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="712247">SERVER-40010</key>
            <summary>Shard secondaries with 4.0 binary and 3.6 FCV are calling `_flushDatabaseCacheUpdates` </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="kaloian.manassiev@mongodb.com">Kaloian Manassiev</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 Mar 2019 12:45:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:23:12 +0000</updated>
                            <resolved>Tue, 12 Mar 2019 20:25:22 +0000</resolved>
                                    <version>4.0.6</version>
                                    <fixVersion>4.0.7</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="2178886" author="xgen-internal-githook" created="Tue, 12 Mar 2019 20:24:30 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Kaloian Manassiev&apos;, &apos;email&apos;: &apos;kaloian.manassiev@mongodb.com&apos;, &apos;username&apos;: &apos;kaloianm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-40010&quot; title=&quot;Shard secondaries with 4.0 binary and 3.6 FCV are calling `_flushDatabaseCacheUpdates` &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-40010&quot;&gt;&lt;del&gt;SERVER-40010&lt;/del&gt;&lt;/a&gt; Make only FCV 4.0 secondaries ask the primary to flush the database cache&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6df770b3a6dc44170389050a4063ffb027357b46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6df770b3a6dc44170389050a4063ffb027357b46&lt;/a&gt;&lt;/p&gt;</comment>
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