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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-32875] Don&apos;t stall ftdc due to running out of tickets</title>
                <link>https://jira.mongodb.org/browse/SERVER-32875</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description></description>
                <environment></environment>
        <key id="486834">SERVER-32875</key>
            <summary>Don&apos;t stall ftdc due to running out of tickets</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="13201">Fixed</resolution>
                                        <assignee username="bruce.lucas@mongodb.com">Bruce Lucas</assignee>
                                    <reporter username="bruce.lucas@mongodb.com">Bruce Lucas</reporter>
                        <labels>
                    </labels>
                <created>Wed, 24 Jan 2018 17:13:27 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:03 +0000</updated>
                            <resolved>Wed, 31 Jan 2018 19:00:21 +0000</resolved>
                                                    <fixVersion>3.4.12</fixVersion>
                                    <component>Concurrency</component>
                    <component>Diagnostics</component>
                                        <votes>2</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="1940848" author="thomas.schubert" created="Fri, 6 Jul 2018 18:10:00 +0000"  >&lt;p&gt;A correct fix was applied to the 3.4 branch under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33233&quot; title=&quot;Don&amp;#39;t stall ftdc due to running out of tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33233&quot;&gt;&lt;del&gt;SERVER-33233&lt;/del&gt;&lt;/a&gt; in 3.4.14&lt;/p&gt;</comment>
                            <comment id="1803686" author="thomas.schubert" created="Mon, 12 Feb 2018 23:17:34 +0000"  >&lt;p&gt;Reverted this fix in the 3.4 branch under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-33238&quot; title=&quot;Prevent WiredTiger read ticket count from going negative&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-33238&quot;&gt;&lt;del&gt;SERVER-33238&lt;/del&gt;&lt;/a&gt; in 3.4.13.&lt;/p&gt;</comment>
                            <comment id="1803678" author="xgen-internal-githook" created="Mon, 12 Feb 2018 23:12:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kelsey@mongodb.com&apos;, &apos;name&apos;: &apos;Kelsey Schubert&apos;, &apos;username&apos;: &apos;Schubes&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32875&quot; title=&quot;Don&amp;#39;t stall ftdc due to running out of tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32875&quot;&gt;&lt;del&gt;SERVER-32875&lt;/del&gt;&lt;/a&gt; Don&apos;t stall ftdc due to running out of tickets&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit 04600d70a4e4ac85c5f199c5756e0e5acb2a7d05.&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac19d2bd2acbc63ba719bd6ddd3fe10fafdf2385&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac19d2bd2acbc63ba719bd6ddd3fe10fafdf2385&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1803676" author="xgen-internal-githook" created="Mon, 12 Feb 2018 23:09:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;kelsey@mongodb.com&apos;, &apos;name&apos;: &apos;Kelsey Schubert&apos;, &apos;username&apos;: &apos;Schubes&apos;}
&lt;p&gt;Message: Revert &quot;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32875&quot; title=&quot;Don&amp;#39;t stall ftdc due to running out of tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32875&quot;&gt;&lt;del&gt;SERVER-32875&lt;/del&gt;&lt;/a&gt; Don&apos;t stall ftdc due to running out of tickets&quot;&lt;/p&gt;

&lt;p&gt;This reverts commit da5520555faef9a2ba9b6c9ec80539ae95ad88a5.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/37505c95cf5f7ededc83fc6a855a46653ac39383&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/37505c95cf5f7ededc83fc6a855a46653ac39383&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1790951" author="xgen-internal-githook" created="Wed, 31 Jan 2018 19:05:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bruce.lucas@mongodb.com&apos;, &apos;name&apos;: &apos;Bruce Lucas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32875&quot; title=&quot;Don&amp;#39;t stall ftdc due to running out of tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32875&quot;&gt;&lt;del&gt;SERVER-32875&lt;/del&gt;&lt;/a&gt; Don&apos;t stall ftdc due to running out of tickets&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/4fa890fa8b6ba3b438213efcfab07b588fd58e63&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/4fa890fa8b6ba3b438213efcfab07b588fd58e63&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1790948" author="xgen-internal-githook" created="Wed, 31 Jan 2018 19:03:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bruce.lucas@mongodb.com&apos;, &apos;name&apos;: &apos;Bruce Lucas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32875&quot; title=&quot;Don&amp;#39;t stall ftdc due to running out of tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32875&quot;&gt;&lt;del&gt;SERVER-32875&lt;/del&gt;&lt;/a&gt; Don&apos;t stall ftdc due to running out of tickets&lt;br/&gt;
Branch: v3.6&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/04600d70a4e4ac85c5f199c5756e0e5acb2a7d05&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/04600d70a4e4ac85c5f199c5756e0e5acb2a7d05&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1790632" author="xgen-internal-githook" created="Wed, 31 Jan 2018 16:13:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;bruce.lucas@mongodb.com&apos;, &apos;name&apos;: &apos;Bruce Lucas&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32875&quot; title=&quot;Don&amp;#39;t stall ftdc due to running out of tickets&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32875&quot;&gt;&lt;del&gt;SERVER-32875&lt;/del&gt;&lt;/a&gt; Don&apos;t stall ftdc due to running out of tickets&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/da5520555faef9a2ba9b6c9ec80539ae95ad88a5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/da5520555faef9a2ba9b6c9ec80539ae95ad88a5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1786083" author="bruce.lucas@10gen.com" created="Fri, 26 Jan 2018 16:58:40 +0000"  >&lt;p&gt;This is simple to reproduce: start a foreground index build, then start &amp;gt;128 threads trying to read from the collection being indexed. This stalls FTDC.&lt;/p&gt;

&lt;p&gt;Would a possible simple solution be to add a flag to OperationContext that means to opt out of the ticket mechanism for all operations on that context? Attached is a simple POC to do that. As a POC it&apos;s only a few lines of code, although with proper engineering it would be a little larger.&lt;/p&gt;

&lt;p&gt;With this POC FTDC no longer stalls in the above repro.&lt;/p&gt;</comment>
                    </comments>
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                                        <issuelink>
            <issuekey id="470028">SERVER-32236</issuekey>
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            <issuekey id="495689">SERVER-33233</issuekey>
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            <issuekey id="495860">SERVER-33238</issuekey>
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                <attachments>
                            <attachment id="176964" name="poc36.diff" size="2559" author="bruce.lucas@mongodb.com" created="Fri, 26 Jan 2018 17:04:44 +0000"/>
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