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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-66327] Remove the setFeatureCompatibilityVersion code in the run_validate_collections.js hook</title>
                <link>https://jira.mongodb.org/browse/SERVER-66327</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4deeaf72d5791abbc83b9c2784f759de7a2faabb/jstests/hooks/run_validate_collections.js#L42-L80&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This code&lt;/a&gt; was added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36718&quot; title=&quot;Validation hook should upgrade before validating index consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36718&quot;&gt;&lt;del&gt;SERVER-36718&lt;/del&gt;&lt;/a&gt; because it was expected that a big index key inserted in FCV 4.2 causes the index validation in FCV 4.0 to fail.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;validate&lt;/tt&gt; should no longer fail because of the server running with an FCV less than the latest version.&lt;/p&gt;

&lt;p&gt;There&apos;s also a build failure where the fuzzer creates a measurement index on a time-series collection and cannot complete a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/4deeaf72d5791abbc83b9c2784f759de7a2faabb/jstests/hooks/run_validate_collections.js#L70-L73&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;previously failed FCV downgrade&lt;/a&gt;, causing the hook to fail.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2042725">SERVER-66327</key>
            <summary>Remove the setFeatureCompatibilityVersion code in the run_validate_collections.js hook</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="13201">Fixed</resolution>
                                        <assignee username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Mon, 9 May 2022 18:31:54 +0000</created>
                <updated>Sun, 29 Oct 2023 21:38:26 +0000</updated>
                            <resolved>Mon, 23 May 2022 17:17:11 +0000</resolved>
                                    <version>6.0.0-rc4</version>
                                    <fixVersion>6.0.0-rc8</fixVersion>
                    <fixVersion>6.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4569951" author="xgen-internal-githook" created="Tue, 24 May 2022 16:39:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66327&quot; title=&quot;Remove the setFeatureCompatibilityVersion code in the run_validate_collections.js hook&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66327&quot;&gt;&lt;del&gt;SERVER-66327&lt;/del&gt;&lt;/a&gt; Omit forceValidationWithFeatureCompatibilityVersion in the jstestfuzz yaml configs&lt;br/&gt;
Branch: v6.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/27921f09fb1f2125a9c2da1b36bde75993c21100&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/27921f09fb1f2125a9c2da1b36bde75993c21100&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4566956" author="xgen-internal-githook" created="Mon, 23 May 2022 17:16:50 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-66327&quot; title=&quot;Remove the setFeatureCompatibilityVersion code in the run_validate_collections.js hook&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-66327&quot;&gt;&lt;del&gt;SERVER-66327&lt;/del&gt;&lt;/a&gt; Omit forceValidationWithFeatureCompatibilityVersion in the jstestfuzz yaml configs&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/c18c0dd8ddfc6cfbd54f8dd095488dd391ea026e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/c18c0dd8ddfc6cfbd54f8dd095488dd391ea026e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4536941" author="max.hirschhorn@10gen.com" created="Mon, 9 May 2022 23:16:33 +0000"  >&lt;blockquote&gt;
&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/4deeaf72d5791abbc83b9c2784f759de7a2faabb/jstests/hooks/run_validate_collections.js#L42-L80&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This code&lt;/a&gt; was added in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-36718&quot; title=&quot;Validation hook should upgrade before validating index consistency&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-36718&quot;&gt;&lt;del&gt;SERVER-36718&lt;/del&gt;&lt;/a&gt; because it was expected that a big index key inserted in FCV 4.2 causes the index validation in FCV 4.0 to fail.&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;validate&lt;/tt&gt; should no longer fail because of the server running with an FCV less than the latest version.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;I&apos;m confused about the &quot;validate should no longer fail&quot; part of this description. For some historical context, going back to decimal128 in MongoDB 3.4 (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-25889&quot; title=&quot;Collection validation should fail if featureCompatibilityVersion is 3.2 and the collection contains NumberDecimal values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-25889&quot;&gt;&lt;del&gt;SERVER-25889&lt;/del&gt;&lt;/a&gt;), the server has typically had the &lt;tt&gt;validate&lt;/tt&gt; command report an error in the lower FCV for any data format which the lower binVersion would be unable to process. This gives a path for customers who are extra cautious and willing to spend the time to know what additional work is needed to safely downgrade their binaries beyond running setFeatureCompatibilityVersion.&lt;/p&gt;

&lt;p&gt;As mentioned in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-43627?focusedCommentId=2433439&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-2433439&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;this comment on SERVER-43627&lt;/a&gt;, if the &lt;tt&gt;validate&lt;/tt&gt; command has the same behavior in both lower FCV and higher FCV then we can have the jstestfuzz&amp;#42;.yml files omit &lt;tt&gt;TestData.forceValidationWithFeatureCompatibilityVersion = latestFCV&lt;/tt&gt;.&lt;/p&gt;</comment>
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