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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-47872] Move the Database class&apos; epoch into the CollectionCatalog</title>
                <link>https://jira.mongodb.org/browse/SERVER-47872</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/db1fae33b7835bc1cae5b3f54365b860e40ac7c1/src/mongo/db/catalog/database_impl.cpp#L134&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Database _epoch field is initialized on instantiation of a DatabaseImpl&lt;/a&gt;. It is never reset, so it can only change by dropping and recreating the database. The only user is RequiresCollectionStage, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/db1fae33b7835bc1cae5b3f54365b860e40ac7c1/src/mongo/db/exec/requires_collection_stage.cpp#L74-L76&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;checks that the db epoch has not changed&lt;/a&gt; on restore after a query yield.&lt;/p&gt;

&lt;p&gt;RequiresCollectionStage also &lt;a href=&quot;https://github.com/mongodb/mongo/blob/db1fae33b7835bc1cae5b3f54365b860e40ac7c1/src/mongo/db/exec/requires_collection_stage.cpp#L54-L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;tracks collection UUID to check on restore&lt;/a&gt;. Therefore, checking the db epoch is superfluous. If the database is dropped and recreated, then the collection is dropped and recreated, which means the UUID changes.&lt;/p&gt;

&lt;p&gt;However, the database epoch also changes when the catalog is closed and reopened, recreating the Database objects. Therefore, we can safely move tracking to the CollectionCatalog class.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1335686">SERVER-47872</key>
            <summary>Move the Database class&apos; epoch into the CollectionCatalog</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="dianna.hohensee@mongodb.com">Dianna Hohensee</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Fri, 1 May 2020 13:30:09 +0000</created>
                <updated>Sun, 29 Oct 2023 22:08:50 +0000</updated>
                            <resolved>Tue, 12 May 2020 03:02:23 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3080008" author="xgen-internal-githook" created="Tue, 12 May 2020 02:56:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dianna Hohensee&apos;, &apos;email&apos;: &apos;dianna.hohensee@mongodb.com&apos;, &apos;username&apos;: &apos;DiannaHohensee&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47872&quot; title=&quot;Move the Database class&amp;#39; epoch into the CollectionCatalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47872&quot;&gt;&lt;del&gt;SERVER-47872&lt;/del&gt;&lt;/a&gt; Move the Database class&apos; epoch into the CollectionCatalog&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/3de4762514cee3507f77efd7b46b20c4362c041a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/3de4762514cee3507f77efd7b46b20c4362c041a&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1330152">SERVER-47803</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1343642">SERVER-48019</issuekey>
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