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    <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-34601] dassert rather than invarianting when attempting to access uninitialized featureCompatibilityVersion</title>
                <link>https://jira.mongodb.org/browse/SERVER-34601</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Presently, our featureCompatibilityVersion getter will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/r3.7.5/src/mongo/db/server_options.h#L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;invariant&lt;/a&gt; that the parameter has been explicitly initialized. However, given the possibility of un-tested featureCompatibilityVersion access scenarios (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-34600&quot; title=&quot;getParameter for featureCompatibilityVersion on uninitialized replica set member causes crash on MongoDB 3.7.5&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-34600&quot;&gt;&lt;del&gt;SERVER-34600&lt;/del&gt;&lt;/a&gt;), it might be better to dassert instead so a user cannot crash non-debug servers when accessing the fCV.&lt;/p&gt;</description>
                <environment></environment>
        <key id="531882">SERVER-34601</key>
            <summary>dassert rather than invarianting when attempting to access uninitialized featureCompatibilityVersion</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="maria.vankeulen@mongodb.com">Maria van Keulen</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Apr 2018 20:51:28 +0000</created>
                <updated>Tue, 6 Dec 2022 03:31:41 +0000</updated>
                            <resolved>Tue, 24 Apr 2018 15:30:24 +0000</resolved>
                                                                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1872692" author="maria.vankeulen" created="Tue, 24 Apr 2018 15:30:24 +0000"  >&lt;p&gt;Per a discussion with &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=milkie&quot; class=&quot;user-hover&quot; rel=&quot;milkie&quot;&gt;milkie&lt;/a&gt;, I will close this ticket as Won&apos;t Fix. We would like to keep the invariant because it helps avoid misuse of getVersion() to read the fCV before it is initialized, and we believe it is unlikely this invariant will cause enough of a usability problem to justify its removal.&lt;/p&gt;</comment>
                            <comment id="1871830" author="schwerin" created="Mon, 23 Apr 2018 19:49:11 +0000"  >&lt;p&gt;Seems suspicious. If it&apos;s OK to observe uninitialized FCV, it shouldn&apos;t crash debug builds. Also, people tend to forget that dasserts don&apos;t equate to runtime guarantees on release builds.&lt;/p&gt;</comment>
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