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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-22199] Collection drop command during checkpoint causes complete stall until end of checkpoint</title>
                <link>https://jira.mongodb.org/browse/SERVER-22199</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Here&apos;s an example:&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/attachment/105419/105419_drop-stall.png&quot; width=&quot;100%&quot; style=&quot;border: 0px solid black&quot; /&gt;&lt;/span&gt;&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Checkpoint from K to N&lt;/li&gt;
	&lt;li&gt;Drop command at L&lt;/li&gt;
	&lt;li&gt;This results in a complete stall from M to N (including the ftdc thread, which explains the lack of ftdc samples from M to N)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Stack traces collected during the stall show why: multiple operations are all stuck in dropAllQueued which in turn is blocked in __wt_session_drop:&lt;/p&gt;
&lt;p/&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The FTDC thread is similarly stuck:&lt;/p&gt;
&lt;p/&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;I believe the sequence is:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;at L the drop command attempts to drop the collection but gets an EBUSY from __wt_session_drop due to the checkpoint, so it queues the drop command for later execution&lt;/li&gt;
	&lt;li&gt;every second from L to M an attempt is made to drop the collection again but again gets an EBUSY from __wt_session_drop so it remains queued and operations continue&lt;/li&gt;
	&lt;li&gt;but starting at M __wt_session_drop no longer returns EBUSY but instead gets stuck waiting on the checkpoint, resulting in the stall&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;It looks like there are two problems:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;due to the logic in dropAllQueued in the integration layer, &lt;em&gt;every&lt;/em&gt; completing operation on all threads attempts to execute the queued drop; this is why the stall is a complete stall, instead of affecting only one thread&lt;/li&gt;
	&lt;li&gt;starting at M, during the critical phase of the check point (coinciding with the &quot;pinned transactions&quot; stat), WT blocks in __wt_session_drop instead of returning EBUSY&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="258884">SERVER-22199</key>
            <summary>Collection drop command during checkpoint causes complete stall until end of checkpoint</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="michael.cahill@mongodb.com">Michael Cahill</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                            <label>WTplaybook</label>
                            <label>code-only</label>
                    </labels>
                <created>Fri, 15 Jan 2016 18:11:38 +0000</created>
                <updated>Fri, 18 Nov 2016 01:38:32 +0000</updated>
                            <resolved>Tue, 2 Feb 2016 05:19:40 +0000</resolved>
                                                    <fixVersion>3.2.3</fixVersion>
                    <fixVersion>3.3.2</fixVersion>
                                    <component>Storage</component>
                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="1180128" author="michael.cahill" created="Mon, 22 Feb 2016 04:40:11 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael%40aorato.com&quot; class=&quot;user-hover&quot; rel=&quot;michael@aorato.com&quot;&gt;michael@aorato.com&lt;/a&gt;, yes, this issue is fixed in 3.2.3.  No changes are required to the application: drops during checkpoints will now return immediately without blocking.  The disk space is reclaimed asynchronously.&lt;/p&gt;</comment>
                            <comment id="1179959" author="michael@aorato.com" created="Sun, 21 Feb 2016 16:46:31 +0000"  >&lt;p&gt;Just to make sure&lt;br/&gt;
This is fixed in 3.2.3?&lt;br/&gt;
If yes, what is fixed mean? we don&apos;t need to do anything and the issue will not appear or do we need to add a flag somewhere for this to be fixed?&lt;/p&gt;</comment>
                            <comment id="1160846" author="ramon.fernandez" created="Tue, 2 Feb 2016 13:33:07 +0000"  >&lt;p&gt;That is correct &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael%40aorato.com&quot; class=&quot;user-hover&quot; rel=&quot;michael@aorato.com&quot;&gt;michael@aorato.com&lt;/a&gt;. We&apos;re working on a 3.2.2-rc0 release candidate, scheduled for the coming days, and it would be useful if you could test it and confirm that the fix produces the desired results in your use case.&lt;/p&gt;</comment>
                            <comment id="1160635" author="michael@aorato.com" created="Tue, 2 Feb 2016 07:56:08 +0000"  >&lt;p&gt;Thanks.&lt;br/&gt;
so this is fixed due to the new flag which by default the drops are now happening in the background? (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-2333&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/WT-2333&lt;/a&gt;)&lt;/p&gt;</comment>
                            <comment id="1160520" author="xgen-internal-githook" created="Tue, 2 Feb 2016 03:43:20 +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-22199&quot; title=&quot;Collection drop command during checkpoint causes complete stall until end of checkpoint&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22199&quot;&gt;&lt;del&gt;SERVER-22199&lt;/del&gt;&lt;/a&gt; Don&apos;t wait for WT locks during drop.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit aa98ee551e0fcface0a1c9d63001c269c068d9ac)&lt;br/&gt;
Branch: v3.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b7bb72efb1e3f96398f1a416de7a102f4eb17f82&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b7bb72efb1e3f96398f1a416de7a102f4eb17f82&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1160517" author="xgen-internal-githook" created="Tue, 2 Feb 2016 03:42:58 +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-22199&quot; title=&quot;Collection drop command during checkpoint causes complete stall until end of checkpoint&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-22199&quot;&gt;&lt;del&gt;SERVER-22199&lt;/del&gt;&lt;/a&gt; Don&apos;t wait for WT locks during drop.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aa98ee551e0fcface0a1c9d63001c269c068d9ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aa98ee551e0fcface0a1c9d63001c269c068d9ac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1150061" author="ramon.fernandez" created="Thu, 21 Jan 2016 16:27:25 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=michael%40aorato.com&quot; class=&quot;user-hover&quot; rel=&quot;michael@aorato.com&quot;&gt;michael@aorato.com&lt;/a&gt;, a short-term fix (&lt;a href=&quot;https://jira.mongodb.org/browse/WT-2333&quot; title=&quot;Add a flag so drop doesn&amp;#39;t block&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2333&quot;&gt;&lt;del&gt;WT-2333&lt;/del&gt;&lt;/a&gt;) is already in code review and should be part of the next stable release. A more comprehensive approach is being investigated in &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2334&quot; title=&quot;Add support for background drops&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2334&quot;&gt;&lt;del&gt;WT-2334&lt;/del&gt;&lt;/a&gt; for later releases. We&apos;ll post updates to this ticket as they become available.&lt;/p&gt;</comment>
                            <comment id="1149823" author="michael@aorato.com" created="Thu, 21 Jan 2016 14:35:18 +0000"  >&lt;p&gt;This is a critical fix for us as we are creating and dropping collections on an hourly basis and due to the stall we could lose data that would otherwise needs to be inserted.&lt;br/&gt;
We ask that this would be prioritized as fast as possible for the next minor release of 3.2.&lt;/p&gt;

&lt;p&gt;Thank you. &lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="105419" name="drop-stall.png" size="107604" author="bruce.lucas@mongodb.com" created="Fri, 15 Jan 2016 18:13:46 +0000"/>
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