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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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<item>
            <title>[SERVER-33238] Prevent WiredTiger read ticket count from going negative</title>
                <link>https://jira.mongodb.org/browse/SERVER-33238</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;div class=&quot;panel&quot; style=&quot;background-color: #EEEEEE;border-color: #ccc;border-width: 1px;&quot;&gt;&lt;div class=&quot;panelHeader&quot; style=&quot;border-bottom-width: 1px;border-bottom-color: #ccc;background-color: #6CB33F;&quot;&gt;&lt;b&gt;Issue Status as of Feb 09, 2018&lt;/b&gt;&lt;/div&gt;&lt;div class=&quot;panelContent&quot; style=&quot;background-color: #EEEEEE;&quot;&gt;
&lt;p&gt;&lt;b&gt;ISSUE SUMMARY&lt;/b&gt;&lt;br/&gt;
MongoDB 3.4.12 contains a bug that may cause WiredTiger read ticket count to become negative.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;ISSUE IMPACT&lt;/b&gt;  &lt;br/&gt;
Users may observe erroneous metric reporting. In particular, read queue metrics, which are derived from read tickets, will appear much larger than they actually are.&lt;/p&gt;

&lt;p&gt;The default limit of 128 available read tickets becomes effectively larger, thus allowing more readers into the system. Workloads which hit the maximum read ticket limits and rely on this mechanism for back pressure may suffer performance degradation.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AFFECTED VERSIONS&lt;/b&gt;&lt;br/&gt;
Only MongoDB 3.4.12 is affected, and only when using the WiredTiger storage engine.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;FIXED VERSIONS&lt;/b&gt;&lt;br/&gt;
A fix is included in MongoDB 3.4.13.&lt;/p&gt;
&lt;/div&gt;&lt;/div&gt;</description>
                <environment></environment>
        <key id="495860">SERVER-33238</key>
            <summary>Prevent WiredTiger read ticket count from going negative</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="ramon.fernandez@mongodb.com">Ramon Fernandez Marina</assignee>
                                    <reporter username="kelsey.schubert@mongodb.com">Kelsey Schubert</reporter>
                        <labels>
                    </labels>
                <created>Fri, 9 Feb 2018 18:52:39 +0000</created>
                <updated>Sun, 29 Oct 2023 22:34:53 +0000</updated>
                            <resolved>Fri, 9 Feb 2018 22:57:27 +0000</resolved>
                                                    <fixVersion>3.4.13</fixVersion>
                                    <component>Concurrency</component>
                    <component>Diagnostics</component>
                                        <votes>0</votes>
                                    <watches>10</watches>
                                                                                                                <comments>
                            <comment id="1802195" author="ramon.fernandez" created="Sun, 11 Feb 2018 14:45:12 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aqueen&quot; class=&quot;user-hover&quot; rel=&quot;aqueen&quot;&gt;aqueen&lt;/a&gt;, 3.4.13 is now &lt;a href=&quot;https://www.mongodb.com/download-center#community&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;available for download&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1801639" author="thomas.schubert" created="Fri, 9 Feb 2018 23:02:42 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=aqueen&quot; class=&quot;user-hover&quot; rel=&quot;aqueen&quot;&gt;aqueen&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;I&apos;ve updated the ticket description to include more details about this issue and its severity.  To reiterate the new description, I expect most users running on MongoDB 3.4.12 will only observe reporting irregularities that may cause false alarm. However, workloads which hit the maximum read ticket limits and rely on this mechanism for back pressure may suffer, since the server will not enforce this limit.&lt;/p&gt;

&lt;p&gt;We expect MongoDB 3.4.13 to be released soon, so I&apos;d suggest waiting for it regardless of whether or not it&apos;s a significant issue for your workload.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1801557" author="xgen-internal-githook" created="Fri, 9 Feb 2018 21:51:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;ramon@mongodb.com&apos;, &apos;name&apos;: &apos;Ramon Fernandez&apos;}
&lt;p&gt;Message: &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; Revert the change that kept ftdc from stalling with no tickets&lt;/p&gt;

&lt;p&gt;This reverts commit 4fa890fa8b6ba3b438213efcfab07b588fd58e63.&lt;br/&gt;
Branch: v3.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/fbdef2ccc53e0fcc9afb570063633d992b2aae42&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/fbdef2ccc53e0fcc9afb570063633d992b2aae42&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1801410" author="aqueen" created="Fri, 9 Feb 2018 20:34:14 +0000"  >&lt;p&gt;I had planned on upgrading some production servers soon to 3.4.12 and I&apos;m worried about a potential issue. What is the severity of this problem? Is this issue something that could cause issues in production in 3.4.12 and should I hold off on upgrading until 3.4.13 is released with the change reverted or the underlying issue resolved?&lt;/p&gt;</comment>
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