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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-59866] Stop FCV from waiting for majority when currentCommittedSnapshot is dropped</title>
                <link>https://jira.mongodb.org/browse/SERVER-59866</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;To avoid breaking the system during a binary upgrade/downgrade, we make &lt;/p&gt;
{getParameter: 1 featureCompatibilityVersion: 1}
&lt;p&gt; wait for the FCV change to make it into the stable checkpoint using the waitForMajority mechanism to wait for the currentCommittedSnapshot, which is usually the same as the stable checkpoint.&lt;/p&gt;

&lt;p&gt;These diverge if we do a config change which either changes the writeConcernMajorityJournalDefault, or is a force config which changes the contents of the set.  At those times the currentCommittedSnapshot is cleared.  This would be inconsequential if it weren&apos;t for another bug: configs with split horizons are erroneously determined to be different when they are not.  This means that a config change brought about by an election, which is a force config on 4.4, can clear the currentCommittedSnapshot.  If we never get a majority write after that point (e.g. because the other nodes were shut down), we will never be able to read the FCV.    Unfortunately Cloud Backup has a procedure which commonly triggers this.&lt;/p&gt;

&lt;p&gt;We can fix this by clearing the lastFCVUpdateSnapshot when we dropAllSnapshots (4.4) or clearCommittedSnapshot (5.0) in ReplicationCoordinatorExternImpl.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1871094">SERVER-59866</key>
            <summary>Stop FCV from waiting for majority when currentCommittedSnapshot is dropped</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="matthew.russotto@mongodb.com">Matthew Russotto</reporter>
                        <labels>
                    </labels>
                <created>Thu, 9 Sep 2021 20:13:20 +0000</created>
                <updated>Sun, 29 Oct 2023 21:48:46 +0000</updated>
                            <resolved>Thu, 23 Sep 2021 14:25:41 +0000</resolved>
                                                    <fixVersion>4.4.10</fixVersion>
                    <fixVersion>5.0.4</fixVersion>
                    <fixVersion>5.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="4106321" author="JIRAUSER1259052" created="Wed, 6 Oct 2021 17:21:50 +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="4102211" author="xgen-internal-githook" created="Tue, 5 Oct 2021 14:15:55 +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-59866&quot; title=&quot;Stop FCV from waiting for majority when currentCommittedSnapshot is dropped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59866&quot;&gt;&lt;del&gt;SERVER-59866&lt;/del&gt;&lt;/a&gt; Stop FCV from waiting for majority when currentCommitted&#8230;&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7e5e6088eaf3ff2e01740cb52efa16c1fb8d360b)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b3cc5b18bda3cd24465126f1603fa54b2ea7926e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b3cc5b18bda3cd24465126f1603fa54b2ea7926e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4099984" author="xgen-internal-githook" created="Mon, 4 Oct 2021 16:35:07 +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-59866&quot; title=&quot;Stop FCV from waiting for majority when currentCommittedSnapshot is dropped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59866&quot;&gt;&lt;del&gt;SERVER-59866&lt;/del&gt;&lt;/a&gt; Stop FCV from waiting for majority when currentCommitted&#8230;&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 7e5e6088eaf3ff2e01740cb52efa16c1fb8d360b)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/bda9de9adfb1b290b59d9787c24d1751a1d3883c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/bda9de9adfb1b290b59d9787c24d1751a1d3883c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4069425" author="xgen-internal-githook" created="Fri, 17 Sep 2021 19:50:17 +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-59866&quot; title=&quot;Stop FCV from waiting for majority when currentCommittedSnapshot is dropped&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-59866&quot;&gt;&lt;del&gt;SERVER-59866&lt;/del&gt;&lt;/a&gt; Stop FCV from waiting for majority when currentCommitted&#8230;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7e5e6088eaf3ff2e01740cb52efa16c1fb8d360b&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7e5e6088eaf3ff2e01740cb52efa16c1fb8d360b&lt;/a&gt;&lt;/p&gt;</comment>
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