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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-84243] Separate Shard-Role Catalog Cache and Loader</title>
                <link>https://jira.mongodb.org/browse/SERVER-84243</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Today, mongod uses a single &lt;tt&gt;CatalogCache&lt;/tt&gt; and &lt;tt&gt;CatalogCacheLoader&lt;/tt&gt; for both it&apos;s shard-role responsibilities (i.e. updating the filtering metadata), and it&apos;s bespoke router-role support (i.e. routing cross-shard $lookup queries).&lt;/p&gt;

&lt;p&gt;As we give mongod &apos;proper&apos; routing support equivalent to the routing facilities mongos provides, we want to allow the routing layer to use a separate CatalogCache that is backed by a ConfigServerCatalogCacheLoader, so that routing operations do not need to stall waiting for replication. However, the shard-role use of the CatalogCache needs to continue to use CatalogCache backed by ShardServerCatalogCacheLoader, to ensure that the routing table view is consistent between primaries and secondaries on refresh.&lt;/p&gt;

&lt;p&gt;To achieve this goal, we&apos;ll support two CatalogCache and CatalogCacheLoader instances in each mongod: one used for routing, and the other for shard-role activities. The use of the shard-role implementation should be very limited; essentially, only to filtering metadata updating. To implement this, we&apos;ll introduce a new CatalogCacheAndLoaderBackingShardRole object that encapsulates the shard-role state, and clarify that the CatalogCache available on the grid should be used exclusively for routing.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2526210">SERVER-84243</key>
            <summary>Separate Shard-Role Catalog Cache and Loader</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="3" iconUrl="https://jira.mongodb.org/images/icons/statuses/inprogress.png" description="This issue is being actively worked on at the moment by the assignee.">In Progress</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="antonio.fuschetto@mongodb.com">Antonio Fuschetto</assignee>
                                    <reporter username="george.wangensteen@mongodb.com">George Wangensteen</reporter>
                        <labels>
                            <label>pm-635-milestone-1</label>
                    </labels>
                <created>Fri, 15 Dec 2023 17:11:36 +0000</created>
                <updated>Tue, 6 Feb 2024 14:03:42 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="6063251" author="JIRAUSER1253399" created="Fri, 2 Feb 2024 17:56:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84548&quot; title=&quot;Using ShardServerCatalogCacheLoader on configsvr causes excessive WT data handles / memory usage&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84548&quot;&gt;SERVER-84548&lt;/a&gt; is a temporary fix for this issue in 7.x versions while &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84243&quot; title=&quot;Separate Shard-Role Catalog Cache and Loader&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84243&quot;&gt;SERVER-84243&lt;/a&gt; is a more permanent fix for 8.0.&lt;/p&gt;</comment>
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            <issuekey id="2549723">SERVER-85370</issuekey>
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            <issuekey id="2552732">SERVER-85525</issuekey>
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            <issuekey id="2485800">SERVER-82588</issuekey>
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