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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-50168] Transition to rollback doesn&apos;t need to clear out the majority committed snapshot&apos;s timestamp.</title>
                <link>https://jira.mongodb.org/browse/SERVER-50168</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, when we transition to rollback we clear out the majority committed snapshot value maintained  in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9d6ae55fd793711dd539fa9322ab5f916b4c89a/src/mongo/db/repl/replication_coordinator_impl.cpp#L5417&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replication coordinator&lt;/a&gt; and by the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9d6ae55fd793711dd539fa9322ab5f916b4c89a/src/mongo/db/storage/wiredtiger/wiredtiger_snapshot_manager.cpp#L66&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;WT engine&apos;s snapshot manager&lt;/a&gt;. And, I think that&apos;s really unnecessary due to below points.&lt;br/&gt;
1) Rollback common point can only be  &amp;gt;= majority committed snapshot value (applies both to EMRC false and true)&lt;br/&gt;
2) For EMRC= true case, when recoverToStableTimestamp() is called no other read or write operations can be performed as recoverToStableTimestamp is performed under global &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9d6ae55fd793711dd539fa9322ab5f916b4c89a/src/mongo/db/repl/rollback_impl.cpp#L1194&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;X&lt;/a&gt; lock&lt;/p&gt;


&lt;p&gt;Also, the comment mentioned &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9d6ae55fd793711dd539fa9322ab5f916b4c89a/src/mongo/db/repl/replication_coordinator_impl.cpp#L4063&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt; looks stale as things have changed a lot after  &lt;a href=&quot;https://github.com/mongodb/mongo/commit/7ef892d32c0507c57eda86ffc591ba5555eb78c6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; commit (which drops the usage of named snapshots). ( Note: as part of this ticket we should also update &lt;a href=&quot;https://github.com/mongodb/mongo/blob/b9d6ae55fd793711dd539fa9322ab5f916b4c89a/src/mongo/db/repl/replication_coordinator_impl.cpp#L5416&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_dropAllSnapshots_inlock()&lt;/a&gt;  to something what it actually does - clearMajorityCommittedTimestamp()).&lt;/p&gt;</description>
                <environment></environment>
        <key id="1434303">SERVER-50168</key>
            <summary>Transition to rollback doesn&apos;t need to clear out the majority committed snapshot&apos;s timestamp.</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="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                    </labels>
                <created>Thu, 6 Aug 2020 21:25:28 +0000</created>
                <updated>Sun, 29 Oct 2023 22:04:43 +0000</updated>
                            <resolved>Wed, 2 Sep 2020 12:58:46 +0000</resolved>
                                                    <fixVersion>4.7.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="3371570" author="xgen-internal-githook" created="Wed, 2 Sep 2020 02:13:15 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-50168&quot; title=&quot;Transition to rollback doesn&amp;#39;t need to clear out the majority committed snapshot&amp;#39;s timestamp.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-50168&quot;&gt;&lt;del&gt;SERVER-50168&lt;/del&gt;&lt;/a&gt; Stop clearing current committed snapshot after rollback&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dce47dd519a2c5d4bce2264ad0a008e2927e2bba&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dce47dd519a2c5d4bce2264ad0a008e2927e2bba&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="1389496">SERVER-49075</issuekey>
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