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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-53643] Startup can see old version of featureCompatibilityVersion document</title>
                <link>https://jira.mongodb.org/browse/SERVER-53643</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;During startup, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/9a7261e0e0fb5eacc5d3354c244e43bd27545819/src/mongo/db/commands/feature_compatibility_version.cpp#L360-L372&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the featureCompatibilityVersion document is checked to ensure a valid FCV&lt;/a&gt;. However, it may be the case that the document was recently updated and this updated version needs to be recovered from the oplog through by replication recovery (as opposed to being able to recover it through WT journal recovery). If this occurs, this FCV validity check could fail even if the FCV had been set to a valid value.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1583622">SERVER-53643</key>
            <summary>Startup can see old version of featureCompatibilityVersion document</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="13201">Fixed</resolution>
                                        <assignee username="matthew.russotto@mongodb.com">Matthew Russotto</assignee>
                                    <reporter username="gregory.noma@mongodb.com">Gregory Noma</reporter>
                        <labels>
                            <label>post-rc0</label>
                    </labels>
                <created>Thu, 7 Jan 2021 23:17:55 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:03 +0000</updated>
                            <resolved>Thu, 27 May 2021 15:15:22 +0000</resolved>
                                                    <fixVersion>4.2.15</fixVersion>
                    <fixVersion>4.4.7</fixVersion>
                    <fixVersion>4.0.26</fixVersion>
                    <fixVersion>5.0.0-rc3</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="4108122" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 18:57:40 +0000"  >&lt;p&gt;Updating the fixversion since branching activities occurred yesterday. This ticket will be in rc0 when it&#8217;s been triggered. For more active release information, please keep an eye on #server-release. Thank you!&lt;/p&gt;</comment>
                            <comment id="3911102" author="xgen-internal-githook" created="Wed, 30 Jun 2021 21:26:11 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53643&quot; title=&quot;Startup can see old version of featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53643&quot;&gt;&lt;del&gt;SERVER-53643&lt;/del&gt;&lt;/a&gt; Wait for FCV to be majority committed before reporting it.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f34d72aed2861b91fdd2907058d1fbec7f66e328)&lt;br/&gt;
Branch: v4.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e0987d2383a8146cb49ef9a01bbe9195a48af27b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e0987d2383a8146cb49ef9a01bbe9195a48af27b&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3910603" author="xgen-internal-githook" created="Wed, 30 Jun 2021 17:54:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53643&quot; title=&quot;Startup can see old version of featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53643&quot;&gt;&lt;del&gt;SERVER-53643&lt;/del&gt;&lt;/a&gt; Wait for FCV to be majority committed before reporting it.&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/736134ae7f00ea8046b43a5e4382289cda33393e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/736134ae7f00ea8046b43a5e4382289cda33393e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3910547" author="xgen-internal-githook" created="Wed, 30 Jun 2021 17:39:13 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53643&quot; title=&quot;Startup can see old version of featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53643&quot;&gt;&lt;del&gt;SERVER-53643&lt;/del&gt;&lt;/a&gt; Wait for FCV to be majority committed before reporting it.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit f34d72aed2861b91fdd2907058d1fbec7f66e328)&lt;br/&gt;
Branch: v4.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d7fd78dead621a539c20791a93abec34bb1be385&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d7fd78dead621a539c20791a93abec34bb1be385&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3881392" author="xgen-internal-githook" created="Wed, 16 Jun 2021 15:11:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53643&quot; title=&quot;Startup can see old version of featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53643&quot;&gt;&lt;del&gt;SERVER-53643&lt;/del&gt;&lt;/a&gt; Wait for FCV to be majority committed before reporting it.&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 11b41d28993c539b2b383d44f7969e6dd8e3f968)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/746d05d3154cfa1f583b91bc2b177c918f59cb8d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/746d05d3154cfa1f583b91bc2b177c918f59cb8d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3844991" author="xgen-internal-githook" created="Thu, 27 May 2021 15:12:33 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Matthew Russotto&apos;, &apos;email&apos;: &apos;matthew.russotto@mongodb.com&apos;, &apos;username&apos;: &apos;mtrussotto&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53643&quot; title=&quot;Startup can see old version of featureCompatibilityVersion document&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53643&quot;&gt;&lt;del&gt;SERVER-53643&lt;/del&gt;&lt;/a&gt; Wait for FCV to be majority committed before reporting it.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/11b41d28993c539b2b383d44f7969e6dd8e3f968&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/11b41d28993c539b2b383d44f7969e6dd8e3f968&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3842624" author="matthew.russotto" created="Wed, 26 May 2021 18:50:49 +0000"  >&lt;p&gt;To be effective this has to be implemented in the version being upgraded from.&lt;/p&gt;</comment>
                            <comment id="3793100" author="matthew.russotto" created="Wed, 19 May 2021 20:15:20 +0000"  >&lt;p&gt;Attached &quot;breakupgrade.js&quot; which reproduces the failure in 5.0.&lt;/p&gt;</comment>
                            <comment id="3791822" author="matthew.russotto" created="Wed, 19 May 2021 15:01:57 +0000"  >&lt;p&gt;I believe it would not be safe to skip this check; the oplog entries we are applying were applied using a 4.0 binary under a 3.6 FCV, and it is not necessarily safe to apply those same oplog entries using a 4.0 FCV and 4.2 binary.&lt;/p&gt;

&lt;p&gt;We may need a change to the upgrade procedure, or perhaps special case getParameter for FCV to wait for the FCV to become stable.&lt;/p&gt;</comment>
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                            <attachment id="315746" name="breakupgrade.js" size="6088" author="matthew.russotto@mongodb.com" created="Wed, 19 May 2021 20:14:47 +0000"/>
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