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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-68522] Prevent 5.0 binary from starting in FCV 4.4 with misconfigured TTL index</title>
                <link>https://jira.mongodb.org/browse/SERVER-68522</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;TTL indexes configured with a NaN for the &lt;a href=&quot;https://www.mongodb.com/docs/manual/tutorial/expire-data/#expire-documents-after-a-specified-number-of-seconds&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;expireAfterSeconds&lt;/a&gt; options are handled differently in 5.0+ binaries by the TTL Monitor for the purposes of calculating an expiration date for the indexed documents. To avoid a mix of 5.0 and 4.4 behaviors for these misconfigured TTL indexes, we should detect these indexes during the upgrade and downgrade steps and fail accordingly.&lt;/p&gt;

&lt;p&gt;With this fix, MongoDB 5.0.11 will:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Log an error and crash on start-up if it&apos;s running in FCV 4.4 and detects a bad index. In addition to clusters upgrading directly from version 4.4, &lt;em&gt;this includes clusters running featureCompatibilityVersion (FCV) 4.4 in versions 5.0.0 - 5.0.10.&lt;/em&gt;&lt;/li&gt;
	&lt;li&gt;Fail to create a new misconfigured TTL index (either via user operation or initial sync) when running FCV 4.4.&lt;/li&gt;
	&lt;li&gt;Start properly and allow the creation of new misconfigured TTL indexes when running FCV 5.0, and treat this configuration as &lt;tt&gt;expireAfterSeconds: 0&lt;/tt&gt;, preserving behavior from versions 5.0.0-5.0.10.&lt;/li&gt;
	&lt;li&gt;Fail to downgrade to FCV 4.4 if a misconfigured TTL index exists.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;To avoid any of these problematic behaviors, do not use &lt;tt&gt;expireAfterSeconds: NaN.&lt;/tt&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2105169">SERVER-68522</key>
            <summary>Prevent 5.0 binary from starting in FCV 4.4 with misconfigured TTL index</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="benety.goh@mongodb.com">Benety Goh</assignee>
                                    <reporter username="dan.larkin-york@mongodb.com">Dan Larkin-York</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Aug 2022 21:48:23 +0000</created>
                <updated>Sun, 29 Oct 2023 21:35:00 +0000</updated>
                            <resolved>Mon, 8 Aug 2022 22:18:30 +0000</resolved>
                                                    <fixVersion>5.0.11</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4736395" author="benety.goh" created="Mon, 8 Aug 2022 22:14:29 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Benety Goh&apos;, &apos;email&apos;: &apos;benety@mongodb.com&apos;, &apos;username&apos;: &apos;benety&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-68522&quot; title=&quot;Prevent 5.0 binary from starting in FCV 4.4 with misconfigured TTL index&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-68522&quot;&gt;&lt;del&gt;SERVER-68522&lt;/del&gt;&lt;/a&gt; Prevent 5.0 binary from starting in FCV 4.4 with misconfigured TTL index&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/abdedd367e2f331816354563f8ae95f6bb35c51d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/abdedd367e2f331816354563f8ae95f6bb35c51d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1702374">SERVER-56676</issuekey>
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            <issuekey id="2104134">SERVER-68477</issuekey>
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