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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-46288] Reconfig in 4.2 style with the current config on FCV downgrade</title>
                <link>https://jira.mongodb.org/browse/SERVER-46288</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Safe reconfig introduces a new field on the config which will make 4.2 binary to fail to start up. Now that we allow 4.4 binary to use and store a config with the new field. We cannot just remove the extra field on downgrade on each node as in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-45092&quot; title=&quot;Remove &#8220;term&#8221; field of config document on downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-45092&quot;&gt;&lt;del&gt;SERVER-45092&lt;/del&gt;&lt;/a&gt;, since in mixed version replset, a reconfig can propagate the config with the extra field to 4.4 binary with FCV 4.2. That will fail 4.2 binary after downgrade.&lt;/p&gt;

&lt;p&gt;Instead, we&apos;ll do a reconfig with a higher config version but no term if the last config has a term field with the same configuration and wait for it to replicate to all nodes before downgrading FCV.&lt;/p&gt;

&lt;p&gt;Also remove the FCV check in&#160;ReplSetHeartbeatArgsV1::addToBSON, we don&apos;t need to check FCV to decide whether to include &quot;configTerm&quot; in heartbeats.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1166925">SERVER-46288</key>
            <summary>Reconfig in 4.2 style with the current config on FCV downgrade</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="siyuan.zhou@mongodb.com">Siyuan Zhou</assignee>
                                    <reporter username="siyuan.zhou@mongodb.com">Siyuan Zhou</reporter>
                        <labels>
                            <label>sharding-csrs-stepdown-only</label>
                    </labels>
                <created>Thu, 20 Feb 2020 22:12:03 +0000</created>
                <updated>Sun, 29 Oct 2023 22:11:57 +0000</updated>
                            <resolved>Mon, 2 Mar 2020 18:39:37 +0000</resolved>
                                                    <fixVersion>4.3.4</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="2922796" author="xgen-internal-githook" created="Mon, 2 Mar 2020 15:14:59 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;William Schultz&apos;, &apos;username&apos;: &apos;will62794&apos;, &apos;email&apos;: &apos;william.schultz@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46288&quot; title=&quot;Reconfig in 4.2 style with the current config on FCV downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46288&quot;&gt;&lt;del&gt;SERVER-46288&lt;/del&gt;&lt;/a&gt; Only drop snapshots on replica set reconfig if the config content changed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f3c6ff922842d56abb15a39e64a27fc6ae087298&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f3c6ff922842d56abb15a39e64a27fc6ae087298&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2921733" author="xgen-internal-githook" created="Mon, 2 Mar 2020 05:39:25 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;username&apos;: &apos;visualzhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46288&quot; title=&quot;Reconfig in 4.2 style with the current config on FCV downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46288&quot;&gt;&lt;del&gt;SERVER-46288&lt;/del&gt;&lt;/a&gt; Fix TODO after safe reconfig downgrade work.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a5582fa42435116ab05efcabddf17219fbd573d6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a5582fa42435116ab05efcabddf17219fbd573d6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2921578" author="xgen-internal-githook" created="Sun, 1 Mar 2020 18:47:00 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;visualzhou&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46288&quot; title=&quot;Reconfig in 4.2 style with the current config on FCV downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46288&quot;&gt;&lt;del&gt;SERVER-46288&lt;/del&gt;&lt;/a&gt; Fix uninitialized argument in unit tests.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/303a937de008fcaabb12204fde38beb4747126a2&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/303a937de008fcaabb12204fde38beb4747126a2&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="2919387" author="xgen-internal-githook" created="Sat, 29 Feb 2020 00:02:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;visualzhou&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46288&quot; title=&quot;Reconfig in 4.2 style with the current config on FCV downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46288&quot;&gt;&lt;del&gt;SERVER-46288&lt;/del&gt;&lt;/a&gt; Reconfig in 4.2 style with the current config on FCV downgrade&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Refactoring doReplSetConfig to accept a callback.&lt;/li&gt;
	&lt;li&gt;Use replset tag system to wait for config replication.&lt;/li&gt;
	&lt;li&gt;Revert kConfigMajority write concern.&lt;/li&gt;
	&lt;li&gt;Include all nodes including arbiters in config replication quorum.&lt;/li&gt;
	&lt;li&gt;Reconfig with term -1 using the current config on downgrade.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6c0645af5999ef52579c04f1b6fff422bd89da3c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6c0645af5999ef52579c04f1b6fff422bd89da3c&lt;/a&gt;&lt;/li&gt;
&lt;/ul&gt;
</comment>
                            <comment id="2919386" author="xgen-internal-githook" created="Sat, 29 Feb 2020 00:02:46 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;username&apos;: &apos;visualzhou&apos;, &apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46288&quot; title=&quot;Reconfig in 4.2 style with the current config on FCV downgrade&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46288&quot;&gt;&lt;del&gt;SERVER-46288&lt;/del&gt;&lt;/a&gt; Fix reconfig audit tests.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mongo-enterprise-modules/commit/e8a636d0772027ae619873f8a20679b3ba7846eb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mongo-enterprise-modules/commit/e8a636d0772027ae619873f8a20679b3ba7846eb&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10011">
                    <name>Depends</name>
                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1143646">SERVER-46089</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                                                <inwardlinks description="is documented by">
                                        <issuelink>
            <issuekey id="1212032">DOCS-13482</issuekey>
        </issuelink>
                            </inwardlinks>
                                    </issuelinktype>
                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1198457">SERVER-46473</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1210361">SERVER-46516</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1217006">SERVER-46571</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1289195">SERVER-47091</issuekey>
        </issuelink>
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