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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-26750] Don&apos;t log a Top entry in ~AutoGetCollectionForRead() if database is dropped</title>
                <link>https://jira.mongodb.org/browse/SERVER-26750</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We expect that Top does not contain entries for collections which no longer exist. When a database is dropped, we clear all of the collections in that database from Top. However, consider the following scenario:&lt;/p&gt;

&lt;ol&gt;
	&lt;li&gt;We drop some database; say &lt;tt&gt;test&lt;/tt&gt;. &lt;tt&gt;dropDatabase&lt;/tt&gt; acquires a database lock in mode X.&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;dropDatabase&lt;/tt&gt; takes a while, and the cursor timeout thread runs on a collection in &lt;tt&gt;test&lt;/tt&gt;.&lt;/li&gt;
	&lt;li&gt;The cursor timeout thread uses &lt;tt&gt;AutoGetCollectionForRead&lt;/tt&gt; and acquires a database lock in mode IS.&lt;/li&gt;
	&lt;li&gt;The cursor timeout thread blocks until &lt;tt&gt;dropDatabase&lt;/tt&gt; succeeds. After completing its work, the destructor of &lt;tt&gt;AutoGetCollectionForRead&lt;/tt&gt; logs an entry in Top, even though the namespace no longer exists.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We should &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/db/db_raii.cpp#L114-L121&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;fix the destructor of &lt;tt&gt;AutoGetCollectionForRead&lt;/tt&gt;&lt;/a&gt; so that this logging does not occur if the database has been dropped. Note that the trivial fix of only calling &lt;tt&gt;Top::record()&lt;/tt&gt; if &lt;tt&gt;_autoColl-&amp;gt;getDb() != nullptr&lt;/tt&gt; is not sufficient because this breaks Top recording for views. (Specifically, &lt;tt&gt;AutoGetCollectionOrViewForRead&lt;/tt&gt; destroys its &lt;tt&gt;_autoColl&lt;/tt&gt; when &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.4.0-rc1/src/mongo/db/db_raii.cpp#L169&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;releasing its locks after resolving a view&lt;/a&gt;.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="326415">SERVER-26750</key>
            <summary>Don&apos;t log a Top entry in ~AutoGetCollectionForRead() if database is dropped</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                            <label>open_todo_in_code</label>
                    </labels>
                <created>Mon, 24 Oct 2016 18:37:41 +0000</created>
                <updated>Tue, 6 Dec 2022 04:13:24 +0000</updated>
                                                                            <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                    <issuelinks>
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                                                                <inwardlinks description="is related to">
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            <issuekey id="320200">SERVER-26425</issuekey>
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