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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-3767] Keep Indexes in Memory on Secondary Nodes</title>
                <link>https://jira.mongodb.org/browse/SERVER-3767</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Replica sets provide great automatic failover and redundancy, but the failover in any relatively high traffic database is almost useless since the secondaries don&apos;t seem to keep indexes or recently queried data in memory. We&apos;ve solved this in the interim by writing a script with slaveok to query in the indexes and &quot;warm the cache.&quot; I consider the fact this is necessary is ridiculous in a production server.&lt;/p&gt;

&lt;p&gt;Could MongoDB secondaries please keep hot-data in memory so that in the case of a failover, page faults don&apos;t skyrocket. At the very least, indexes should always be kept in RAM.&lt;/p&gt;</description>
                <environment></environment>
        <key id="21927">SERVER-3767</key>
            <summary>Keep Indexes in Memory on Secondary Nodes</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="backlog-server-repl">Backlog - Replication Team</assignee>
                                    <reporter username="mitchellh">Mitchell Hashimoto</reporter>
                        <labels>
                    </labels>
                <created>Tue, 6 Sep 2011 18:58:44 +0000</created>
                <updated>Thu, 14 Sep 2023 12:15:04 +0000</updated>
                            <resolved>Thu, 14 Sep 2023 12:15:04 +0000</resolved>
                                    <version>1.8.2</version>
                                                    <component>Index Maintenance</component>
                    <component>Performance</component>
                    <component>Replication</component>
                                        <votes>4</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="5703581" author="christopher.harris" created="Thu, 14 Sep 2023 12:15:04 +0000"  >&lt;p&gt;This functionality was delivered via &lt;a href=&quot;https://www.mongodb.com/docs/manual/replication/#mirrored-reads&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Mirrored Reads&lt;/a&gt; which are available beginning in version 4.4&lt;/p&gt;</comment>
                            <comment id="55197" author="dwight_10gen" created="Mon, 19 Sep 2011 21:39:45 +0000"  >&lt;p&gt;typically the application of writes results in things being paged in.  but under certain circumstances (such as a restart and few new writes) nothing would be there.  might make sense for some queries to percolate through that say &quot;touch this&quot; or to prefetch from some indexes if file system cache is not full.&lt;/p&gt;

&lt;p&gt;would be helpful to know how other databases have approached historically.&lt;/p&gt;</comment>
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