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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-48019] Investigate whether queries can continue after a yield when the catalog has been closed and reopened</title>
                <link>https://jira.mongodb.org/browse/SERVER-48019</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Since &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37449&quot; title=&quot;Delete CursorManager&amp;#39;s PlanExecutor registry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37449&quot;&gt;&lt;del&gt;SERVER-37449&lt;/del&gt;&lt;/a&gt;, with &lt;a href=&quot;https://github.com/mongodb/mongo/commit/0c83f08e77642cdf2c303edc05c42059179a48c7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this change&lt;/a&gt;, query will check on restore that the database epoch has not changed since yielding. This was to handle invalidation of catalog pointers when the catalog is closed and reopened. Currently, only rollback closes and reopens the catalog: the restartCatalog command has been removed.&lt;/p&gt;

&lt;p&gt;However, RequiresCollectionStage, which handles restoring the query and checking the database epoch, is supposed to contain all the pointers that the query needs. Therefore, there shouldn&apos;t be an invalid pointers, because RequiresCollectionStage&apos;s restore resets them all with the latest from the reopened catalog.&lt;/p&gt;

&lt;p&gt;So we want to know whether this epoch check is still necessary (something was broken back when &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-37449&quot; title=&quot;Delete CursorManager&amp;#39;s PlanExecutor registry&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-37449&quot;&gt;&lt;del&gt;SERVER-37449&lt;/del&gt;&lt;/a&gt; was committed); or what is no longer valid after closing and reopening the catalog. It could be that storage-level cursors can get invalidated if the catalog has been closed and re-opened.&lt;/p&gt;

&lt;p&gt;(note: &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; will move the epoch from the Database to the CollectionCatalog)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1343642">SERVER-48019</key>
            <summary>Investigate whether queries can continue after a yield when the catalog has been closed and reopened</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="13202">Works as Designed</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="dianna.hohensee@mongodb.com">Dianna Hohensee</reporter>
                        <labels>
                    </labels>
                <created>Thu, 7 May 2020 19:20:09 +0000</created>
                <updated>Fri, 27 Oct 2023 13:52:51 +0000</updated>
                            <resolved>Thu, 7 May 2020 19:34:47 +0000</resolved>
                                                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>0</watches>
                                                                                                                <comments>
                            <comment id="3074597" author="connie.chen" created="Thu, 7 May 2020 19:34:47 +0000"  >&lt;p&gt;Queries should not to survive rollback&lt;/p&gt;</comment>
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