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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-71635] MongoDB4.2.23 can not downgrade to 4.0.28.</title>
                <link>https://jira.mongodb.org/browse/SERVER-71635</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When I upgrade mongodb3.6.20 replication set, I follow the official instructions completely.&lt;br/&gt;
Then &#160;3.6.20 up to 4.0.28 is ok, &#160;4.0.28 up to 4.2.23 is ok, 4.2.23 up to 4.4.17 is ok.&lt;/p&gt;

&lt;p&gt;When I downgrade the replication set, 4.4.17 downgrade to 4.2.23 is ok, but 4.2.23 downgrade to 4.0.28, then reports errors: &quot;2022-11-22T16:03:49.271+0800 E STORAGE &#160;&lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (-31802) &lt;span class=&quot;error&quot;&gt;&amp;#91;1669104229:271646&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;28181:0x2b6d74d7aa80&amp;#93;&lt;/span&gt;, connection: __log_open_verify, 985: unsupported WiredTiger file version: this build only supports versions up to 3, and the file is version 4: WT_ERROR: non-specific WiredTiger error Raw: &lt;span class=&quot;error&quot;&gt;&amp;#91;1669104229:271646&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;28181:0x2b6d74d7aa80&amp;#93;&lt;/span&gt;, connection: __log_open_verify, 985: unsupported WiredTiger file version: this build only supports versio&quot;&lt;/p&gt;

&lt;p&gt;And I found that: 3.6.20 up to 4.0.28 is ok, 4.0.28 up to 4.2.23 is ok, and then 4.2.23 down to 4.0.28 is ok. That is,&#160; if not up to 4.4.17,then 4.2.23 can down to 4.0.28.&lt;/p&gt;

&lt;p&gt;Thanks. &#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2195887">SERVER-71635</key>
            <summary>MongoDB4.2.23 can not downgrade to 4.0.28.</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="13202">Works as Designed</resolution>
                                        <assignee username="yuan.fang@mongodb.com">Yuan Fang</assignee>
                                    <reporter username="chenhuayun@sina.com">nycle chen</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Nov 2022 06:28:07 +0000</created>
                <updated>Fri, 27 Oct 2023 13:51:49 +0000</updated>
                            <resolved>Fri, 2 Dec 2022 16:19:19 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5025611" author="JIRAUSER1270794" created="Fri, 2 Dec 2022 16:18:28 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=chenhuayun%40sina.com&quot; class=&quot;user-hover&quot; rel=&quot;chenhuayun@sina.com&quot;&gt;chenhuayun@sina.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for reporting the issue that occurred during downgrading. Please note that downgrading multiple major versions (e.g. 4.4 to 4.2 to 4.0) is not supported, thus any techniques that try to fulfill this use-case have no guarantee of working.&#160;&lt;/p&gt;

&lt;p&gt;Additionally, MongoDB version 4.0 &lt;a href=&quot;https://www.mongodb.com/support-policy/legacy&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;reached the end of life in April 2022&lt;/a&gt; and is no longer supported and our general guidance is to avoid downgrading to an unsupported version.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Yuan&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="2195883">SERVER-71634</issuekey>
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            <issuelink>
            <issuekey id="2127214">SERVER-69354</issuekey>
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