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<channel>
    <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-12554] Count queries negatively impact concurrency</title>
                <link>https://jira.mongodb.org/browse/SERVER-12554</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;My query concurrency tests showed up a clear regression when different kind of queries are executed concurrently.&lt;br/&gt;
I relied on git bisect to find out where the problem was, starting from&lt;/p&gt;
&lt;p/&gt;
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					&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;Good revision: 06851f4859a61019a17147ea96c4e6d9462f354b&lt;/span&gt;&lt;/pre&gt;
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					&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;Bad revision: f2ece186b189b2b9d09636c708f768fb3822b511&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The commit that caused the regression is:&lt;/p&gt;
&lt;p/&gt;
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					&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;# git bisect good 2bee3f018b8d4351f8261c405adcdff44c7f9a70&lt;/span&gt;&lt;/pre&gt;
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						&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;3b3c25e571852893373ae2e2b361397b260687c9 is the first bad commit&lt;/span&gt;&lt;/pre&gt;
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					&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;commit 3b3c25e571852893373ae2e2b361397b260687c9&lt;/span&gt;&lt;/pre&gt;
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					&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;Author: Hari Khalsa &amp;lt;hkhalsa@10gen.com&amp;gt;&lt;/span&gt;&lt;/pre&gt;
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						&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;Date:   Mon Jan 27 18:01:26 2014 -0500&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&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;    SERVER-12460 faster count for simple queries&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;I more carefully looked at the server logs and realized there&apos;s something unusual:&lt;/p&gt;
&lt;p/&gt;
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&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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						&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;2014-01-30T14:48:52.824-0500 [conn133] command test1.$cmd command: { count: &quot;QA408&quot;, query: { timestamp: { $gte: new Date(1388927893439), $lte: new Date(1388999113439) } }, limit: 1 } keyUpdates:0 numYields:22 locks(micros) r:5722 reslen:48 111ms&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2014-01-30T14:48:52.835-0500 [conn129] command test1.$cmd command: { count: &quot;QA408&quot;, query: { timestamp: { $gte: new Date(1389166093427), $lte: new Date(1389327733427) } }, limit: 1 } keyUpdates:0 numYields:50 locks(micros) r:6720 reslen:48 129ms&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;2014-01-30T14:48:52.847-0500 [conn119] command test1.$cmd command: { count: &quot;QA408&quot;, query: { timestamp: { $gte: new Date(1390298233437), $lte: new Date(1390424353437) } }, limit: 1 } keyUpdates:0 numYields:40 locks(micros) r:6359 reslen:48 136ms&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Lots of yields &amp;#8211; apparently this didn&apos;t happen before the change.&lt;br/&gt;
CPU profiling via gperftools confirmsthe suspects, FWIW.&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;
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					&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;[...]&lt;/span&gt;&lt;/pre&gt;
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					&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;     .      .   79:         for (;;) {&lt;/span&gt;&lt;/pre&gt;
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						&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;     .      .   80:             // Yield, if we can yield ourselves.&lt;/span&gt;&lt;/pre&gt;
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						&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;    76    337   81:             if (NULL != _yieldPolicy.get() &amp;amp;&amp;amp; _yieldPolicy-&amp;gt;shouldYield()) {&lt;/span&gt;&lt;/pre&gt;
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						&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;     .    166   82:                 saveState();&lt;/span&gt;&lt;/pre&gt;
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						&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;    23   4884   83:                 _yieldPolicy-&amp;gt;yield();&lt;/span&gt;&lt;/pre&gt;
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						&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;     4      8   84:                 if (_killed) { return Runner::RUNNER_DEAD; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;</description>
                <environment>Linux ip-10-232-37-146.ec2.internal 2.6.32-358.14.1.el6.x86_64 #1 SMP Mon Jun 17 15:54:20 EDT 2013 x86_64 x86_64 x86_64 GNU/Linux</environment>
        <key id="108454">SERVER-12554</key>
            <summary>Count queries negatively impact concurrency</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="davide.italiano">Davide Italiano</assignee>
                                    <reporter username="davide.italiano">Davide Italiano</reporter>
                        <labels>
                            <label>26qa</label>
                    </labels>
                <created>Thu, 30 Jan 2014 20:44:30 +0000</created>
                <updated>Mon, 11 Jul 2016 17:16:52 +0000</updated>
                            <resolved>Tue, 18 Feb 2014 02:28:24 +0000</resolved>
                                    <version>2.5.5</version>
                                    <fixVersion>2.6.0-rc0</fixVersion>
                                    <component>Concurrency</component>
                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="522842" author="xgen-internal-githook" created="Tue, 25 Mar 2014 15:11:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hkhalsa&apos;, u&apos;name&apos;: u&apos;Hari Khalsa&apos;, u&apos;email&apos;: u&apos;hkhalsa@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13336&quot; title=&quot;Count with no results, never yields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13336&quot;&gt;&lt;del&gt;SERVER-13336&lt;/del&gt;&lt;/a&gt; count should always yield&lt;/p&gt;

&lt;p&gt;Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12554&quot; title=&quot;Count queries negatively impact concurrency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12554&quot;&gt;&lt;del&gt;SERVER-12554&lt;/del&gt;&lt;/a&gt; Lazily yield on count queries.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 2850cc7253344c639bc9a01bc6dff3ffd2cca422.&lt;br/&gt;
Branch: v2.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f77427bddf29b2f07dcd2620abffa57b1f7c2655&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f77427bddf29b2f07dcd2620abffa57b1f7c2655&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="522840" author="xgen-internal-githook" created="Tue, 25 Mar 2014 15:10:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;hkhalsa&apos;, u&apos;name&apos;: u&apos;Hari Khalsa&apos;, u&apos;email&apos;: u&apos;hkhalsa@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-13336&quot; title=&quot;Count with no results, never yields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-13336&quot;&gt;&lt;del&gt;SERVER-13336&lt;/del&gt;&lt;/a&gt; count should always yield&lt;/p&gt;

&lt;p&gt;Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12554&quot; title=&quot;Count queries negatively impact concurrency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12554&quot;&gt;&lt;del&gt;SERVER-12554&lt;/del&gt;&lt;/a&gt; Lazily yield on count queries.&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 2850cc7253344c639bc9a01bc6dff3ffd2cca422.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/1f762a3478bb2f794e72670d333f35c6b7e6cfa7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/1f762a3478bb2f794e72670d333f35c6b7e6cfa7&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="500410" author="xgen-internal-githook" created="Tue, 18 Feb 2014 02:26:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dcci&apos;, u&apos;name&apos;: u&apos;Davide Italiano&apos;, u&apos;email&apos;: u&apos;davide.italiano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12554&quot; title=&quot;Count queries negatively impact concurrency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12554&quot;&gt;&lt;del&gt;SERVER-12554&lt;/del&gt;&lt;/a&gt; Lazily yield on count queries.&lt;/p&gt;

&lt;p&gt;This avoids a regression when scanning a small set of documents.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/2850cc7253344c639bc9a01bc6dff3ffd2cca422&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/2850cc7253344c639bc9a01bc6dff3ffd2cca422&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="497774" author="xgen-internal-githook" created="Wed, 12 Feb 2014 14:40:32 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;IanWhalen&apos;, u&apos;name&apos;: u&apos;Ian Whalen&apos;, u&apos;email&apos;: u&apos;ian@mongodb.com&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12554&quot; title=&quot;Count queries negatively impact concurrency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12554&quot;&gt;&lt;del&gt;SERVER-12554&lt;/del&gt;&lt;/a&gt; Mimic 2.4 behaviour and lazily yield in order to&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit d6873ccb663a07de47738af913fd25ceff23296f.&lt;/p&gt;

&lt;p&gt;Reverting because commit broke counttests.cpp in core suite on all platforms&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4de0fdb367ee24a1551989815ac8bff58d064118&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4de0fdb367ee24a1551989815ac8bff58d064118&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="497481" author="xgen-internal-githook" created="Tue, 11 Feb 2014 23:06:38 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dcci&apos;, u&apos;name&apos;: u&apos;Davide Italiano&apos;, u&apos;email&apos;: u&apos;davide.italiano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12554&quot; title=&quot;Count queries negatively impact concurrency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12554&quot;&gt;&lt;del&gt;SERVER-12554&lt;/del&gt;&lt;/a&gt; Mimic 2.4 behaviour and lazily yield in order to&lt;br/&gt;
avoid a regression whne scanning a small set of documents.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d6873ccb663a07de47738af913fd25ceff23296f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d6873ccb663a07de47738af913fd25ceff23296f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="497466" author="xgen-internal-githook" created="Tue, 11 Feb 2014 22:53:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dcci&apos;, u&apos;name&apos;: u&apos;Davide Italiano&apos;, u&apos;email&apos;: u&apos;davide.italiano@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12554&quot; title=&quot;Count queries negatively impact concurrency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12554&quot;&gt;&lt;del&gt;SERVER-12554&lt;/del&gt;&lt;/a&gt; There&apos;s no need to iterate all over the runner if limit&lt;br/&gt;
is set, because this is really expensive (the scan it done under&lt;br/&gt;
lock scope).&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d8332443b6737565e32dc8d28317ed245173fa46&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d8332443b6737565e32dc8d28317ed245173fa46&lt;/a&gt;&lt;/p&gt;</comment>
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