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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>
    </build-info>


<item>
            <title>[SERVER-32590] RTT 3.6&lt;-&gt;4.0 upgrade/downgrade.</title>
                <link>https://jira.mongodb.org/browse/SERVER-32590</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;On clean shutdown when in FCV 3.6 a 4.0 binary must:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;Set the WT &quot;recovery timestamp&quot; to 0&lt;/li&gt;
	&lt;li&gt;Take an unstable checkpoint&lt;/li&gt;
	&lt;li&gt;Enable WT logging for all tables&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Additionally, a 4.0 binary running in FCV 3.6 should persist some state such that a 3.6 binary cannot startup on the datafiles following a crash.&lt;/p&gt;</description>
                <environment></environment>
        <key id="480305">SERVER-32590</key>
            <summary>RTT 3.6&lt;-&gt;4.0 upgrade/downgrade.</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>neweng</label>
                            <label>rollback-non-functional</label>
                    </labels>
                <created>Mon, 8 Jan 2018 21:56:20 +0000</created>
                <updated>Mon, 30 Oct 2023 23:09:30 +0000</updated>
                            <resolved>Fri, 18 May 2018 11:09:11 +0000</resolved>
                                                    <fixVersion>4.0.0-rc0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1894910" author="xgen-internal-githook" created="Fri, 18 May 2018 04:03:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32590&quot; title=&quot;RTT 3.6&amp;lt;-&amp;gt;4.0 upgrade/downgrade.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32590&quot;&gt;&lt;del&gt;SERVER-32590&lt;/del&gt;&lt;/a&gt;: WT 3.6 &amp;lt;-&amp;gt; 4.0 upgrade/downgrade.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/180e9e548df8261a919000aa68b9419b9df093f2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/180e9e548df8261a919000aa68b9419b9df093f2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1862855" author="daniel.gottlieb@10gen.com" created="Thu, 12 Apr 2018 18:59:56 +0000"  >&lt;p&gt;With &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3959&quot; title=&quot;Recovery timestamp set on restart scenarios need addressing&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3959&quot;&gt;&lt;del&gt;WT-3959&lt;/del&gt;&lt;/a&gt;, the original intention of this ticket is accomplished; the recovery timestamp will be set to 0 when the checkpoint at shutdown is taken with `use_timestamp=false`.&lt;/p&gt;

&lt;p&gt;I&apos;m repurposing this ticket for changing the log file version back down to the 3.6 compatible version when the server performs a clean shutdown with FCV 3.6. This depends on &lt;a href=&quot;https://jira.mongodb.org/browse/WT-4029&quot; title=&quot;Bump the log file version&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-4029&quot;&gt;&lt;del&gt;WT-4029&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1793084" author="daniel.gottlieb@10gen.com" created="Fri, 2 Feb 2018 14:15:29 +0000"  >&lt;p&gt;I think the way to do this is to unset the &lt;tt&gt;stable_timestamp&lt;/tt&gt; before closing the connection. Some discussion was on the original &lt;a href=&quot;https://jira.mongodb.org/browse/WT-3387&quot; title=&quot;Add support for a stable timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;WT-3387&quot;&gt;&lt;del&gt;WT-3387&lt;/del&gt;&lt;/a&gt; ticket.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="495418">WT-3906</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="533524">WT-4056</issuekey>
        </issuelink>
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                    <name>Duplicate</name>
                                                                <inwardlinks description="is duplicated by">
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            <issuekey id="416875">SERVER-30667</issuekey>
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            <issuelink>
            <issuekey id="416876">SERVER-30668</issuekey>
        </issuelink>
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                            <issuelinktype id="10423">
                    <name>Gantt End to End</name>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="532963">SERVER-34630</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="397599">WT-3387</issuekey>
        </issuelink>
                            </outwardlinks>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="754855">SERVER-40954</issuekey>
        </issuelink>
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