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    <title>MongoDB Jira</title>
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    <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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            <title>[DOCS-3177] The per-database RW-lock is not yielded when searching an index</title>
                <link>https://jira.mongodb.org/browse/DOCS-3177</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;The docs at &lt;a href=&quot;http://smalldatum.blogspot.com/2014/04/mongodb-tokumx-and-innodb-for-disk-io_15.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://smalldatum.blogspot.com/2014/04/mongodb-tokumx-and-innodb-for-disk-io_15.html&lt;/a&gt; were not clear to me on three issues:&lt;br/&gt;
1) the per-db RW-lock is not yielded from page faults while searching an index.&lt;br/&gt;
2) this is only done for &quot;predicted page faults&quot;, not real page faults. And I am not suggesting that it should be done on real page faults.&lt;br/&gt;
3) a pending write lock request prevents new read requests when the per-db RW-lock is currently locked in read-mode. The FAQ states that W has precedence over read but I think that you should also mention this behavior.&lt;/p&gt;

&lt;p&gt;See &lt;a href=&quot;http://smalldatum.blogspot.com/2014/04/mongodb-tokumx-and-innodb-for-disk-io_15.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://smalldatum.blogspot.com/2014/04/mongodb-tokumx-and-innodb-for-disk-io_15.html&lt;/a&gt; for performance results and a brief description of the code. &lt;/p&gt;</description>
                <environment></environment>
        <key id="131341">DOCS-3177</key>
            <summary>The per-database RW-lock is not yielded when searching an index</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="mdcallag">Mark Callaghan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Apr 2014 20:13:42 +0000</created>
                <updated>Mon, 16 Mar 2015 23:56:25 +0000</updated>
                            <resolved>Thu, 26 Jun 2014 19:09:02 +0000</resolved>
                                                    <fixVersion>v1.3.7</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="635335" author="xgen-internal-githook" created="Thu, 26 Jun 2014 19:08:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-3177&quot; title=&quot;The per-database RW-lock is not yielded when searching an index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3177&quot;&gt;&lt;del&gt;DOCS-3177&lt;/del&gt;&lt;/a&gt; concurency FAQ updates&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/e06b57ff6cca21fda63bd58429e035d3c7b9c065&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/e06b57ff6cca21fda63bd58429e035d3c7b9c065&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="550723" author="mdcallag" created="Tue, 15 Apr 2014 20:50:33 +0000"  >&lt;p&gt;First link should be &lt;a href=&quot;http://docs.mongodb.org/manual/faq/concurrency/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/manual/faq/concurrency/&lt;/a&gt;&lt;/p&gt;</comment>
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