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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-47205] Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault</title>
                <link>https://jira.mongodb.org/browse/SERVER-47205</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After a reconfig, we &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b70908c4898c4b02d8c70df3f796fa3e8cfe5bdd/src/mongo/db/repl/replication_coordinator_impl.cpp#L3450&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;drop snapshots&lt;/a&gt;, since the definition of majority-committed can change. However, all this does is &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b70908c4898c4b02d8c70df3f796fa3e8cfe5bdd/src/mongo/db/repl/replication_coordinator_impl.cpp#L5077&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;set &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt; to none&lt;/a&gt;. It does not change the &lt;br/&gt;
 &lt;tt&gt;_lastCommittedOpTimeAndWallTime&lt;/tt&gt; in the &lt;tt&gt;TopologyCoordinator&lt;/tt&gt;. This means that the next time we set &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt;, either due to the &lt;tt&gt;JournalFlusher&lt;/tt&gt; or &lt;tt&gt;replSetUpdatePosition&lt;/tt&gt;, we will &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b70908c4898c4b02d8c70df3f796fa3e8cfe5bdd/src/mongo/db/repl/topology_coordinator.cpp#L2791-L2800&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refuse to set &lt;tt&gt;_lastCommittedOpTimeAndWallTime&lt;/tt&gt; backward&lt;/a&gt;, so &lt;tt&gt;_currentCommittedSnapshot&lt;/tt&gt; can be set to its previous value from before the reconfig. This means that dropping snapshots after reconfig doesn&#8217;t accomplish anything.&lt;/p&gt;

&lt;p&gt;The safe reconfig protocol guarantees that operations committed in the old config will never roll back, so we can stop dropping snapshots after a safe reconfig that does not change &lt;tt&gt;writeConcernMajorityJournalDefault&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1298176">SERVER-47205</key>
            <summary>Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="tess.avitabile@mongodb.com">Tess Avitabile</reporter>
                        <labels>
                            <label>former-quick-wins</label>
                    </labels>
                <created>Tue, 31 Mar 2020 13:27:22 +0000</created>
                <updated>Fri, 1 Dec 2023 13:44:35 +0000</updated>
                            <resolved>Fri, 17 Apr 2020 15:34:53 +0000</resolved>
                                                    <fixVersion>4.4.0-rc3</fixVersion>
                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3053770" author="xgen-internal-githook" created="Fri, 24 Apr 2020 02:02:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47205&quot; title=&quot;Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47205&quot;&gt;&lt;del&gt;SERVER-47205&lt;/del&gt;&lt;/a&gt; Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault&lt;/p&gt;

&lt;p&gt;(cherry picked from commit a397fc442440984fca2ab37f491759745979ab2d)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/70b693235173db39960fb5828b7594ce2c1f8eae&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/70b693235173db39960fb5828b7594ce2c1f8eae&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3044779" author="siyuan.zhou@10gen.com" created="Fri, 17 Apr 2020 15:38:41 +0000"  >&lt;p&gt;The backport of this ticket is necessary for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47205&quot; title=&quot;Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47205&quot;&gt;&lt;del&gt;SERVER-47205&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3044744" author="xgen-internal-githook" created="Fri, 17 Apr 2020 15:31:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Siyuan Zhou&apos;, &apos;email&apos;: &apos;siyuan.zhou@mongodb.com&apos;, &apos;username&apos;: &apos;visualzhou&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47205&quot; title=&quot;Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47205&quot;&gt;&lt;del&gt;SERVER-47205&lt;/del&gt;&lt;/a&gt; Stopping dropping snapshots after safe reconfig that does not change writeConcernMajorityJournalDefault&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a397fc442440984fca2ab37f491759745979ab2d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a397fc442440984fca2ab37f491759745979ab2d&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1210361">SERVER-46516</issuekey>
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            <issuelink>
            <issuekey id="1293070">SERVER-47142</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="738780">SERVER-40649</issuekey>
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            <issuelink>
            <issuekey id="2496022">SERVER-83092</issuekey>
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            <issuekey id="1298181">SERVER-47206</issuekey>
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