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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-71634] mongodb4.2.23 can not downgrade to mongodb4.0.23</title>
                <link>https://jira.mongodb.org/browse/SERVER-71634</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 down to 4.2.23 is ok, but 4.2.23 down 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, 4.0.28 up to 4.2.23, and then 4.2.23 down to 4.0.28 is ok. That is, if not up to 4.4.17,then 4.2.23 can down to 4.0.23.&lt;/p&gt;

&lt;p&gt;Thanks. &#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2195883">SERVER-71634</key>
            <summary>mongodb4.2.23 can not downgrade to mongodb4.0.23</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="1" iconUrl="https://jira.mongodb.org/images/icons/priorities/blocker.svg">Blocker - P1</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>
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                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="chenhuayun@sina.com">nycle chen</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Nov 2022 06:22:43 +0000</created>
                <updated>Mon, 28 Nov 2022 14:14:54 +0000</updated>
                            <resolved>Mon, 28 Nov 2022 14:14:54 +0000</resolved>
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