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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-25500] Collection drops can cause busy applications to stall</title>
                <link>https://jira.mongodb.org/browse/SERVER-25500</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The reason drops are problematic is that WiredTiger makes a table drop fail if there are any open cursors on the table. MongoDB caches cursors because opening them can be expensive (as we see here). That means the low-level drop operation often fails, and in that case, the MongoDB session cache will close all cached sessions and cursors to allow the drop to succeed.&lt;/p&gt;

&lt;p&gt;A lot of the impact of drops is caused by contention for the mutex in WiredTiger that protects the list of handles, because the new sessions need to acquire that lock to open a cursor on a table for the first time.&lt;/p&gt;

&lt;p&gt;Calling &lt;tt&gt;closeAll&lt;/tt&gt; in the session cache when a drop fails is overly aggressive. There is no need to close all sessions, and in fact only cursors on tables we are trying to drop need to be closed.  Even if we switch to closing all cursors in that case, the impact will be substantially lower, because a WiredTiger session can reopen a cursor on a table it has cached without acquiring any locks.&lt;/p&gt;</description>
                <environment></environment>
        <key id="307478">SERVER-25500</key>
            <summary>Collection drops can cause busy applications to stall</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="michael.cahill@mongodb.com">Michael Cahill</reporter>
                        <labels>
                            <label>code-only</label>
                    </labels>
                <created>Tue, 9 Aug 2016 06:45:08 +0000</created>
                <updated>Wed, 23 Nov 2016 18:44:38 +0000</updated>
                            <resolved>Thu, 11 Aug 2016 02:12:48 +0000</resolved>
                                    <version>3.2.8</version>
                    <version>3.3.10</version>
                                    <fixVersion>3.2.9</fixVersion>
                    <fixVersion>3.3.11</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>22</watches>
                                                                                                                <comments>
                            <comment id="1353646" author="michael.cahill" created="Thu, 11 Aug 2016 02:12:48 +0000"  >&lt;p&gt;We are still waiting for confirmation that this change is sufficient to fix the original problem as reported, but resolving this ticket because the changes considered here have now been committed (and backported to v3.2).&lt;/p&gt;</comment>
                            <comment id="1353643" author="xgen-internal-githook" created="Thu, 11 Aug 2016 02:02:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25500&quot; title=&quot;Collection drops can cause busy applications to stall&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25500&quot;&gt;&lt;del&gt;SERVER-25500&lt;/del&gt;&lt;/a&gt; Close cursors rather than sessions when a drop fails.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fb99b3a9a1ea15e3df1b2545970a47df97703895&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fb99b3a9a1ea15e3df1b2545970a47df97703895&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1352321" author="xgen-internal-githook" created="Wed, 10 Aug 2016 03:34:39 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;michaelcahill&apos;, u&apos;name&apos;: u&apos;Michael Cahill&apos;, u&apos;email&apos;: u&apos;michael.cahill@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25500&quot; title=&quot;Collection drops can cause busy applications to stall&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25500&quot;&gt;&lt;del&gt;SERVER-25500&lt;/del&gt;&lt;/a&gt; If drop fails, close cursors, not sessions.&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/22ec9e93b40c85fc7cae7d56e7d6a02fd811088c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/22ec9e93b40c85fc7cae7d56e7d6a02fd811088c&lt;/a&gt;&lt;/p&gt;</comment>
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