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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <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-33835] remove hierarchical structure between databases and collections from CatalogCache</title>
                <link>https://jira.mongodb.org/browse/SERVER-33835</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The CatalogCache currently stores databases and collections hierarchically:&lt;/p&gt;

&lt;p&gt;DatabaseInfoEntry -&amp;gt; map&amp;lt;string, CollectionRoutingInfoEntry&amp;gt;&lt;/p&gt;

&lt;p&gt;So, the CatalogCache::getDatabase() method will refresh a single DatabaseInfoEntry, which&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;refreshes from &lt;b&gt;config.databases&lt;/b&gt; for the document representing this database&lt;/li&gt;
	&lt;li&gt;refreshes from &lt;b&gt;config.collections&lt;/b&gt; for the documents representing collections in this database&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The CatalogCache::getDatabase() method additionally marks each collection in the database as needsRefresh=true, so any subsequent calls to CatalogCache::getCollectionRoutingInfo will&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;refresh from &lt;b&gt;config.chunks&lt;/b&gt; for the documents representing chunks in this collection&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This is problematic for the database versioning project, where we would like to do a lightweight refresh just from config.databases on StaleDbVersion, without causing heavyweight refreshes from config.collections and, worse, config.chunks.&lt;/p&gt;

&lt;p&gt;This ticket is to remove the hierarchy from the CatalogCache, so that &lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;CatalogCache::getDatabase() refreshes from just config.databases&lt;/li&gt;
	&lt;li&gt;CatalogCache::getCollection() refreshes from just config.collections and config.chunks&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;This ticket will also remove the CachedCollectionRoutingInfo, which is currently a &quot;package&quot; of both the CachedDatabaseInfo and ChunkManager, in favor of:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;CatalogCache::getDatabase() returning CachedDatabaseInfo&lt;/li&gt;
	&lt;li&gt;CatalogCache::getCollection() returning CachedCollectionInfo&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;The CachedDatabaseInfo/CachedCollectionInfo will be thin wrappers around a shared_ptr to the corresponding DatabaseInfoEntry/CollectionInfoEntry, except they will not expose the ability to mark the entries as needsRefresh=true.&lt;/p&gt;

&lt;p&gt;This ticket will also add the ability to mark a DatabaseInfoEntry as needsRefresh=true.&lt;/p&gt;</description>
                <environment></environment>
        <key id="510104">SERVER-33835</key>
            <summary>remove hierarchical structure between databases and collections from CatalogCache</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="13201">Fixed</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Mar 2018 20:36:51 +0000</created>
                <updated>Sun, 29 Oct 2023 22:33:51 +0000</updated>
                            <resolved>Thu, 29 Mar 2018 19:05:10 +0000</resolved>
                                                    <fixVersion>3.7.4</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1849511" author="xgen-internal-githook" created="Thu, 29 Mar 2018 19:04:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;esha.maharishi@mongodb.com&apos;, &apos;name&apos;: &apos;Esha Maharishi&apos;, &apos;username&apos;: &apos;EshaMaharishi&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33835&quot; title=&quot;remove hierarchical structure between databases and collections from CatalogCache&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33835&quot;&gt;&lt;del&gt;SERVER-33835&lt;/del&gt;&lt;/a&gt; Remove hierarchical structure between databases and collections from CatalogCache&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a4d81c1fe912f51669a8fb8f3e47515d9eab20a7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a4d81c1fe912f51669a8fb8f3e47515d9eab20a7&lt;/a&gt;&lt;/p&gt;</comment>
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