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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>
    </build-info>


<item>
            <title>[SERVER-26425] Top entries may remain if write conflict occurs during dropDatabase</title>
                <link>https://jira.mongodb.org/browse/SERVER-26425</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a database is dropped, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.3.15/src/mongo/db/catalog/database.cpp#L659-L661&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;dropDatabase()&lt;/tt&gt; removes each collection from Top&lt;/a&gt;. If a write conflict exception occurs before or during this loop, entries may remain in Top even after &lt;tt&gt;dropDatabase()&lt;/tt&gt; finishes successfully.&lt;/p&gt;</description>
                <environment></environment>
        <key id="320200">SERVER-26425</key>
            <summary>Top entries may remain if write conflict occurs during dropDatabase</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="9">Done</resolution>
                                        <assignee username="kyle.suarez@mongodb.com">Kyle Suarez</assignee>
                                    <reporter username="kyle.suarez@mongodb.com">Kyle Suarez</reporter>
                        <labels>
                    </labels>
                <created>Fri, 30 Sep 2016 19:30:27 +0000</created>
                <updated>Mon, 31 Oct 2016 13:31:21 +0000</updated>
                            <resolved>Tue, 25 Oct 2016 15:43:09 +0000</resolved>
                                    <version>3.3.15</version>
                                    <fixVersion>3.4.0-rc2</fixVersion>
                                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1416958" author="xgen-internal-githook" created="Tue, 25 Oct 2016 15:42:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;ksuarz&apos;, u&apos;name&apos;: u&apos;Kyle Suarez&apos;, u&apos;email&apos;: u&apos;kyle.suarez@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-26425&quot; title=&quot;Top entries may remain if write conflict occurs during dropDatabase&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-26425&quot;&gt;&lt;del&gt;SERVER-26425&lt;/del&gt;&lt;/a&gt; perform dropDatabase in WriteConflictException retry loop&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1e6fe6df6941e97c73db086e6ec7ebb24bc7dec9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1e6fe6df6941e97c73db086e6ec7ebb24bc7dec9&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1400795" author="kyle.suarez" created="Wed, 5 Oct 2016 15:02:52 +0000"  >&lt;p&gt;In my attempts to reproduce this, I enabled the &lt;tt&gt;WTWriteConflictException&lt;/tt&gt; failpoint and introduced a sleep &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.3.15/src/mongo/db/catalog/database.cpp#L660&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;when &lt;tt&gt;Database::dropDatabase()&lt;/tt&gt; clears entries from Top&lt;/a&gt;. Unfortunately, I&apos;ve hit something unexpected &amp;#8211; in debug builds, background jobs run every second instead of every minute. If we sleep for too long, we hit the cursor timeout limit; the job that does this timing out acquires a read lock on the collection. Once &lt;tt&gt;dropDatabase()&lt;/tt&gt; relinquishes its lock, the read lock is acquired, and an entry for the collection is logged into Top when &lt;tt&gt;AutoGetCollectionForRead&lt;/tt&gt; goes out of scope. Here is a stack trace:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; src/mongo/db/stats/top.cpp:96:0: mongo::Top::record(mongo::OperationContext*, mongo::StringData, mongo::LogicalOp, int, long long, bool, mongo::Command::ReadWriteType)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; src/mongo/db/db_raii.cpp:121:0: mongo::AutoGetCollectionForRead::~AutoGetCollectionForRead()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; src/mongo/db/catalog/cursor_manager.cpp:278:0: mongo::GlobalCursorIdCache::timeoutCursors(mongo::OperationContext*, int)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; src/mongo/db/catalog/cursor_manager.cpp:291:0: mongo::CursorManager::timeoutCursorsGlobal(mongo::OperationContext*, int)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; src/mongo/db/clientcursor.cpp:271:0: mongo::ClientCursorMonitor::run()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; src/mongo/util/background.cpp:151:0: mongo::BackgroundJob::jobBody()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I am still confident that adding a retry loop to &lt;tt&gt;KVStorageEngine::dropDatabase()&lt;/tt&gt; is a needed improvement, but in addition, we should update &lt;tt&gt;top_drop.js&lt;/tt&gt; to be more resilient against unexpected entries being added to Top because of other threads.&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is depended on by">
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="326415">SERVER-26750</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                <attachments>
                            <attachment id="140173" name="repro.patch" size="1182" author="kyle.suarez@mongodb.com" created="Fri, 30 Sep 2016 19:31:45 +0000"/>
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&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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