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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-30348] on a cluster, allow initiating downgrade (or continuing upgrade) after a failed upgrade and vice versa</title>
                <link>https://jira.mongodb.org/browse/SERVER-30348</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This ticket only deals with the sharding part of upgrade/downgrade (that is, _configsvrSetFeatureCompatibilityVersion), &lt;b&gt;not&lt;/b&gt; the upgrade/downgrade on a replica set or single mongod (done through setFeatureCompatibilityVersion).&lt;/p&gt;

&lt;p&gt;The cluster upgrade behavior should already ensure UUIDs are persisted in config.collections for all sharded collections, and that shards&apos; notion of a sharded collection&apos;s UUID matches what&apos;s in config.collections.&lt;/p&gt;

&lt;p&gt;This ticket is to test this behavior by inducing a failed upgrade (or downgrade), resuming upgrade (or downgrade) or initiating downgrade (or upgrade) afterwards and ensuring the UUIDs across the cluster are consistent.&lt;/p&gt;</description>
                <environment></environment>
        <key id="408754">SERVER-30348</key>
            <summary>on a cluster, allow initiating downgrade (or continuing upgrade) after a failed upgrade and vice versa</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Wed, 26 Jul 2017 19:33:43 +0000</created>
                <updated>Wed, 4 Oct 2017 21:05:25 +0000</updated>
                            <resolved>Wed, 4 Oct 2017 21:05:25 +0000</resolved>
                                    <version>3.5.10</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1689575" author="esha.maharishi@10gen.com" created="Wed, 4 Oct 2017 21:05:25 +0000"  >&lt;p&gt;Instead, we are disallowing initiating downgrade if partway through upgrade and vice versa. See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-30515&quot; title=&quot;disallow initiating cluster FCV downgrade in the middle of upgrade (and vice versa)&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-30515&quot;&gt;&lt;del&gt;SERVER-30515&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="1655123" author="esha.maharishi@10gen.com" created="Wed, 23 Aug 2017 16:06:42 +0000"  >&lt;p&gt;See this existing jstest for asserting that setFCV succeeds/fails, and checking cluster consistency: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/jstests/sharding/uuid_propagated_to_shards_on_setFCV_3_6.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/jstests/sharding/uuid_propagated_to_shards_on_setFCV_3_6.js&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1655121" author="esha.maharishi@10gen.com" created="Wed, 23 Aug 2017 16:05:28 +0000"  >&lt;p&gt;This ticket should add a failpoint in the server that fails _configsvrSetFeatureCompatibilityVersion partway through sending setFeatureCompatibilityVersion to shards.&lt;/p&gt;

&lt;p&gt;It should add a test that checks four scenarios:&lt;br/&gt;
1) starting with a fcv=3.4 cluster (but with 3.6 binaries), turn on the failpoint, send setFeatureCompatibilityVersion: 3.6 to a mongos, and assert that it fails. then, turn off the failpoint and &quot;resume&quot; upgrade by sending setFeatureCompatibilityVersion: 3.6 to a mongos and assert that it works.&lt;br/&gt;
2) the same as 1, but rather than &quot;resuming&quot; upgrade, &quot;initiate&quot; downgrade by sending setFeatureCompatibilityVersion: 3.4 in the second step&lt;br/&gt;
3) starting with a fcv=3.6 cluster (and 3.6 binaries), turn on the failpoint, send setFeatureCompatibilityVersion: 3.4 to a mongos, and assert that it fails. then, turn off the failpoint and &quot;resume&quot; downgrade by sending setFeatureCompatibilityVersion: 3.4 to a mongos and assert that it works.&lt;br/&gt;
4) the same as 3, but rather than &quot;resuming&quot; downgrade, &quot;initiate&quot; upgrade by sending setFeatureCompatibilityVersion: 3.6 in the second step&lt;/p&gt;

&lt;p&gt;CC &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=cristopher.stauffer&quot; class=&quot;user-hover&quot; rel=&quot;cristopher.stauffer&quot;&gt;cristopher.stauffer&lt;/a&gt;&lt;/p&gt;</comment>
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