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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-22209] Collection creation during final phase of checkpoint holds database lock for extended time</title>
                <link>https://jira.mongodb.org/browse/SERVER-22209</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/105476/105476_create-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;At B we see an operation acquring the db lock (acquireCount)&lt;/li&gt;
	&lt;li&gt;Apparently that operation blocks because we see many threads queuing up behind it (timeAcquiringMicros), resulting in a complete stall in this case (single db)&lt;/li&gt;
	&lt;li&gt;This has occurred during the final phase of a checkpoint (range of IDs pinned), and ends at the end of the checkpoint&lt;/li&gt;
	&lt;li&gt;In the same app (not shown above) we see other create collections during a checkpoint, but not during the final phase, that do not cause a similar stall, so this appears to be specific to the final phase of a checkpoint.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Stack traces collected during the stall show that the blocked operation is a create collection (this was not evident from the stats and required stack traces because this was an implicit create and we don&apos;t have a counter for that), and that it is blocked in __wt_session_create:&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;

&lt;p&gt;Stack traces also confirm multiple threads queued up behind db lock:&lt;/p&gt;
&lt;p/&gt;
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			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="258996">SERVER-22209</key>
            <summary>Collection creation during final phase of checkpoint holds database lock for extended time</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-and-test</label>
                    </labels>
                <created>Sat, 16 Jan 2016 12:21:33 +0000</created>
                <updated>Wed, 7 Dec 2016 22:50:11 +0000</updated>
                            <resolved>Mon, 4 Apr 2016 02:02:59 +0000</resolved>
                                                    <fixVersion>3.2.5</fixVersion>
                    <fixVersion>3.3.4</fixVersion>
                                    <component>WiredTiger</component>
                                        <votes>2</votes>
                                    <watches>18</watches>
                                                                                                                <comments>
                            <comment id="1244671" author="adq" created="Sat, 23 Apr 2016 08:17:22 +0000"  >&lt;p&gt;You&apos;re right. Thanks for looking into it though!&lt;/p&gt;</comment>
                            <comment id="1244428" author="ramon.fernandez" created="Fri, 22 Apr 2016 20:59:48 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=adq%40tvsquared.com&quot; class=&quot;user-hover&quot; rel=&quot;adq@tvsquared.com&quot;&gt;adq@tvsquared.com&lt;/a&gt;, a backport to the 3.0 series is not feasible, but that should not affect you: I&apos;d recommend you upgrade to 3.0+MMPAv1, and move to 3.2+WiredTiger from there &amp;#8211; that way you avoid the configuration affected by this issue (3.0 + WiredTiger).&lt;/p&gt;</comment>
                            <comment id="1154193" author="ramon.fernandez" created="Tue, 26 Jan 2016 17:38:34 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=adq&quot; class=&quot;user-hover&quot; rel=&quot;adq&quot;&gt;adq&lt;/a&gt;, we need to wait and see how the fix looks for the development branch before we can decide if it&apos;s safe to backport to older branches. The decision will be reflected in changes to the &quot;fixVersion&quot; field. Until then I&apos;m requesting a backport to v3.0 on your behalf.&lt;/p&gt;</comment>
                            <comment id="1154173" author="adq" created="Tue, 26 Jan 2016 17:22:28 +0000"  >&lt;p&gt;Will this fix be backported to the 3.0 series as well? &lt;/p&gt;

&lt;p&gt;We&apos;re still on 2.6, so we need to upgrade to 3.0, and then on to 3.2. If this fix isn&apos;t backported, there&apos;s a window when we&apos;ll be running a pure 3.0 system on live at risk of these long lock times.&lt;/p&gt;</comment>
                            <comment id="1151332" author="ajax@tvsquared.com" created="Fri, 22 Jan 2016 17:02:40 +0000"  >&lt;p&gt;Hi Ramon, thanks for getting back so quickly.&lt;br/&gt;
I understand that this is WT rather than mongo3+. We are on mongo2.6 and were looking at mongo3+WT for the performance improvements.&lt;br/&gt;
We have a high volume (~2000/sec, 4-6k mongo ops/sec) web hit tracking infrastructure, so the write performance improvements in WT where the main appeal of moving - the use case is very simple queries so the other 3.2 improvements weren&apos;t immediately relevant.&lt;br/&gt;
However we dynamically create collections, and this lock was causing unacceptable delays (it also appears to occur on index creation). We also ran into &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19768&quot; title=&quot;Failed applyOps command does not create an oplog entry even with some successful writes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19768&quot;&gt;&lt;del&gt;SERVER-19768&lt;/del&gt;&lt;/a&gt; on mongo3.2.&lt;br/&gt;
We&apos;ve temporarily increased the infrastructure under 2.6 and are considering 3.0-MMap for the collection level concurrency, but otherwise we&apos;ll have to wait.&lt;/p&gt;</comment>
                            <comment id="1151311" author="ramon.fernandez" created="Fri, 22 Jan 2016 16:49:54 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ajax%40tvsquared.com&quot; class=&quot;user-hover&quot; rel=&quot;ajax@tvsquared.com&quot;&gt;ajax@tvsquared.com&lt;/a&gt;, this issue only affects the WiredTiger storage engine. If you&apos;re considering upgrading note you can still upgrade to MongoDB 3.2 and continue to use the MMAPv1 storage engine. This will allow you to use all the new features in 3.2 (document validation, partial indexes, aggregation improvements) and set the stage for a transition to the WiredTiger storage engine once this issue is resolved.&lt;/p&gt;</comment>
                            <comment id="1151170" author="ajax@tvsquared.com" created="Fri, 22 Jan 2016 14:58:10 +0000"  >&lt;p&gt;This issue (and possibly related index creation locks that behave identically) is currently keeping us on mongodb 2.6.&lt;/p&gt;</comment>
                            <comment id="1150649" author="alexander.gorrod" created="Thu, 21 Jan 2016 22:51:25 +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; We are actively pursuing a fix for this problem. We have isolated and understand the cause for the problem. We have created a reproducing case inside WiredTiger (see &lt;a href=&quot;https://jira.mongodb.org/browse/WT-2342&quot; title=&quot;Enhance wtperf to support background create and drop operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-2342&quot;&gt;&lt;del&gt;WT-2342&lt;/del&gt;&lt;/a&gt;), and are working on a fix. Once the fix is complete and tested we will work on back porting it to 3.2.&lt;/p&gt;</comment>
                            <comment id="1149824" author="michael@aorato.com" created="Thu, 21 Jan 2016 14:35:27 +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>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
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                            <issuelinktype id="10010">
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