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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-38082] replica between different version in 3.X</title>
                <link>https://jira.mongodb.org/browse/SERVER-38082</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I try to upgrade/downgrade MongoDB version using replica set (rs.add command)&lt;br/&gt;
I tried many test&#160;but I am not sure if below method are correct method&lt;/p&gt;

&lt;p&gt;I try to find official Doc but I did not find&lt;/p&gt;


&lt;p&gt;in situation&lt;/p&gt;

&lt;p&gt;master member : 3.4 binary (with featureCompatibilityVersion 3.4)&lt;/p&gt;

&lt;p&gt;test 1: rs.add (with 3.6 binary (with featureCompatibilityVersion 3.4)&lt;br/&gt;
test 2: rs.add (with 3.2 binary )&lt;/p&gt;


&lt;p&gt;master member : 3.2 binary (with featureCompatibilityVersion 3.2)&lt;/p&gt;

&lt;p&gt;test 1: rs.add (with 3.4 binary (with featureCompatibilityVersion 3.2)&lt;br/&gt;
test 2: rs.add (with 3.6 binary (with featureCompatibilityVersion 3.2)&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="632372">SERVER-38082</key>
            <summary>replica between different version in 3.X</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</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="daniel.hatcher@mongodb.com">Danny Hatcher</assignee>
                                    <reporter username="mingyu.lee@linecorp.com">lee mingyu</reporter>
                        <labels>
                    </labels>
                <created>Mon, 12 Nov 2018 11:55:06 +0000</created>
                <updated>Tue, 16 Nov 2021 18:29:43 +0000</updated>
                            <resolved>Mon, 12 Nov 2018 14:44:05 +0000</resolved>
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                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2058658" author="daniel.hatcher" created="Mon, 12 Nov 2018 14:43:58 +0000"  >&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;Our documentation has the upgrade process for every version. For example, here is the documentation for &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/3.6-upgrade-replica-set/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;upgrading a Replica Set to 3.6&lt;/a&gt;. Please note that you *&lt;b&gt;must not&lt;/b&gt;* skip major versions while upgrading. In order to upgrade from 3.2 to 3.6, you need to first upgrade everything from 3.2 to 3.4 and then upgrade from 3.4 to 3.6.&lt;/p&gt;

&lt;p&gt;Thank you very much,&lt;/p&gt;

&lt;p&gt;Danny&lt;/p&gt;</comment>
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