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    <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-53697] Directory per DB broken when enableMajorityReadConcern=false is set</title>
                <link>https://jira.mongodb.org/browse/SERVER-53697</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When enableMajorityReadConcern=false it set dropping collections is not using the ident reaper and is dropped in a commit handler for the storage transaction dropping the collection.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0ce2fa7273aa7f4c7170c1bba3944efe46b4f043/src/mongo/db/storage/storage_util.cpp#L111&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/0ce2fa7273aa7f4c7170c1bba3944efe46b4f043/src/mongo/db/storage/storage_util.cpp#L111&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53535&quot; title=&quot;Rename with dropTarget must be done atomically in the catalog to prevent a lock free reader to observe intermediate invalid state&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53535&quot;&gt;&lt;del&gt;SERVER-53535&lt;/del&gt;&lt;/a&gt; added proper isolation for collection drops and they are now committed into the catalog as the last commit handler that executes on the recovery unit. This causes the code that checks if we need to delete an empty directory to run too early as the collection hasn&apos;t been removed from the catalog yet.&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/0ce2fa7273aa7f4c7170c1bba3944efe46b4f043/src/mongo/db/storage/storage_util.cpp#L54-L58&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/0ce2fa7273aa7f4c7170c1bba3944efe46b4f043/src/mongo/db/storage/storage_util.cpp#L54-L58&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This code can have its RecoveryUnit moved from one OperationContext to another so it is not safe to capture the&#160;OperationContext in the lambda for the commit handler. That makes it not possible to check if the last Collection in the catalog is about to be dropped by looking at UncommittedCatalogUpdates for this OperationContext.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Another possible solution would be to allow for registering Callbacks that run &lt;em&gt;after&lt;/em&gt; the special RecoveryUnit Change that is responsible for catalog visibility. However that comes with its own issues and such Callbacks would have to adhere to their own set of special rules (no further modification of writable collections)&lt;/p&gt;</description>
                <environment></environment>
        <key id="1586032">SERVER-53697</key>
            <summary>Directory per DB broken when enableMajorityReadConcern=false is set</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="henrik.edin@mongodb.com">Henrik Edin</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Mon, 11 Jan 2021 19:32:06 +0000</created>
                <updated>Sun, 29 Oct 2023 21:58:56 +0000</updated>
                            <resolved>Tue, 12 Jan 2021 14:15:28 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3559094" author="xgen-internal-githook" created="Tue, 12 Jan 2021 03:12:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53697&quot; title=&quot;Directory per DB broken when enableMajorityReadConcern=false is set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53697&quot;&gt;&lt;del&gt;SERVER-53697&lt;/del&gt;&lt;/a&gt; Fix deleting of empty directories when using directoryPerDb and enableMajorityReadConcern=false&lt;/p&gt;

&lt;p&gt;The callback with the logic is running before the collection is removed from the catalog. Blindly attempt to delete the empty directory in this case.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a534ed2ab5494aceb713b7505a973f4446231426&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a534ed2ab5494aceb713b7505a973f4446231426&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1578209">SERVER-53535</issuekey>
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