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            <title>[SERVER-36507] Downgrading WT from FCV 4.2 -&gt; 4.0 requires an &quot;acquiesced&quot; system</title>
                <link>https://jira.mongodb.org/browse/SERVER-36507</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The 4.0 -&amp;gt; 3.6 FCV downgrade path in storage would acquiesce the system by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/aa0062e8aaa5a8273bb33a2afaf8c9cdf5fbede7/src/mongo/db/storage/wiredtiger/wiredtiger_kv_engine.cpp#L665-L670&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;closing/re-opening the WT connection&lt;/a&gt;. That was originally done to facilitate changing table logging settings.&lt;/p&gt;

&lt;p&gt;4.2 development &lt;a href=&quot;https://github.com/mongodb/mongo/commit/013b82bf5f58bd7de8ae2f4d28d24f82afa22e64#diff-8fd4ad8935bb2bf3f91bb01f4785c544L659&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;optimistically removed the close/open along with the table logging changes&lt;/a&gt; under the assumption that changing the file compatibility on reconfigure (which remains in the upgrade/downgrade path) did not need to be acquiesced to the same degree.&lt;/p&gt;</description>
                <environment></environment>
        <key id="585151">SERVER-36507</key>
            <summary>Downgrading WT from FCV 4.2 -&gt; 4.0 requires an &quot;acquiesced&quot; system</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="daniel.gottlieb@mongodb.com">Daniel Gottlieb</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                            <label>nyc</label>
                    </labels>
                <created>Tue, 7 Aug 2018 19:56:20 +0000</created>
                <updated>Sun, 29 Oct 2023 22:29:10 +0000</updated>
                            <resolved>Thu, 27 Dec 2018 16:23:28 +0000</resolved>
                                                    <fixVersion>4.1.7</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2101013" author="xgen-internal-githook" created="Thu, 27 Dec 2018 16:22:55 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;dgottlieb&apos;, &apos;email&apos;: &apos;daniel.gottlieb@mongodb.com&apos;, &apos;name&apos;: &apos;Daniel Gottlieb&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36507&quot; title=&quot;Downgrading WT from FCV 4.2 -&amp;gt; 4.0 requires an &amp;quot;acquiesced&amp;quot; system&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36507&quot;&gt;&lt;del&gt;SERVER-36507&lt;/del&gt;&lt;/a&gt;: Clean WT state before performing a reconfigure for downgrade.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e9ab3a4f84e51e30e95c8e0c8f9ae46237e1a926&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e9ab3a4f84e51e30e95c8e0c8f9ae46237e1a926&lt;/a&gt;&lt;/p&gt;</comment>
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