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    <title>MongoDB Jira</title>
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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-35117] Enumerate and remove Storage-related FeatureCompatibilityVersion 3.6-dependent code and tests</title>
                <link>https://jira.mongodb.org/browse/SERVER-35117</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The following needs to be done:&lt;br/&gt;
 1. Create a list of tickets with code and tests to remove and mark them as &#8220;is depended on by&#8221; this ticket. This will assist the Upgrade/Downgrade Team in tracking progress.&lt;br/&gt;
 2. Complete said tickets promptly.&lt;/p&gt;

&lt;p&gt;3.&#160;Create a ticket identifying Storage-related generic upgrade/downgrade references that the Upgrade/Downgrade team should update now that the 3.6-dependent references have been removed.&lt;/p&gt;</description>
                <environment></environment>
        <key id="547126">SERVER-35117</key>
            <summary>Enumerate and remove Storage-related FeatureCompatibilityVersion 3.6-dependent code and tests</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="9">Done</resolution>
                                        <assignee username="maria.vankeulen@mongodb.com">Maria van Keulen</assignee>
                                    <reporter username="blake.oler@mongodb.com">Blake Oler</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Mon, 21 May 2018 15:51:06 +0000</created>
                <updated>Mon, 18 Jun 2018 21:30:18 +0000</updated>
                            <resolved>Mon, 18 Jun 2018 21:30:18 +0000</resolved>
                                                                    <component>Storage</component>
                    <component>Upgrade/Downgrade</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1921529" author="michael.cahill" created="Fri, 15 Jun 2018 06:47:43 +0000"  >&lt;p&gt;I was asked specifically about &lt;tt&gt;WiredTigerKVEngine::cleanShutdown&lt;/tt&gt; and the places where MongoDB configures&#160;&lt;tt&gt;compatibility&lt;/tt&gt; versions for WiredTiger.&lt;/p&gt;

&lt;p&gt;For the purposes of unblocking this work, we should set &lt;tt&gt;compatibility=(require_min=&quot;3.1&quot;)&lt;/tt&gt; (was &lt;del&gt;3.1.0&lt;/del&gt;) to determine whether starting with FCV=4.0.  References to earlier WT versions should be removed.  Since &lt;tt&gt;compatibility&lt;/tt&gt; is omitted to enable the latest behavior in WiredTiger, none of these changes need to wait for the WiredTiger version to be bumped.&lt;/p&gt;

&lt;p&gt;When downgrading (to 4.0) as part of clean shutdown, if downgrading:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;we should remove any &lt;tt&gt;use_timestamp&lt;/tt&gt; configuration to &lt;tt&gt;WT_CONNECTION::close&lt;/tt&gt; (the default behavior should be correct for 4.1 and above)&lt;/li&gt;
	&lt;li&gt;we should remove the loop that calls &lt;tt&gt;WiredTigerUtil::setTableLogging&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;we should not need to close / reopen and then close again.&lt;/li&gt;
	&lt;li&gt;Instead, it should be sufficient to call &lt;tt&gt;_conn-&amp;gt;reconfigure&lt;/tt&gt; with &lt;tt&gt;compatibility=(release=3.1)&lt;/tt&gt; with just one call to &lt;tt&gt;_conn-&amp;gt;close&lt;/tt&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
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