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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-53436] Transition to primary writes minValid doc with timestamp lastApplied with readers on the same timestamp under lock free reads</title>
                <link>https://jira.mongodb.org/browse/SERVER-53436</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The step up process is clearing appliedThrough by writing to the minValid document at timestamp lastApplied.&lt;br/&gt;
 &lt;a href=&quot;https://github.com/mongodb/mongo/blob/d5743ba8411a50534d33bc2e940377fb003dccea/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L503-L510&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/d5743ba8411a50534d33bc2e940377fb003dccea/src/mongo/db/repl/replication_coordinator_external_state_impl.cpp#L503-L510&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;With lock free reads, holding the RSTL in exclusive mode is not blocking readers. So secondaries may have readers on timestamp lastApplied.&lt;/p&gt;

&lt;p&gt;This is causing an assert in WiredTiger that we are writing to a timestamp that we have active readers on.&lt;/p&gt;

&lt;p&gt;The problem is reproducible by running test jstests/replsets/read_operations_during_step_up.js with LockFreeReads enabled.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1572122">SERVER-53436</key>
            <summary>Transition to primary writes minValid doc with timestamp lastApplied with readers on the same timestamp under lock free reads</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="samy.lanka@mongodb.com">Samyukta Lanka</assignee>
                                    <reporter username="henrik.edin@mongodb.com">Henrik Edin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 18 Dec 2020 17:00:43 +0000</created>
                <updated>Sun, 29 Oct 2023 21:59:24 +0000</updated>
                            <resolved>Fri, 8 Jan 2021 13:44:41 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3554219" author="xgen-internal-githook" created="Fri, 8 Jan 2021 02:56:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Henrik Edin&apos;, &apos;email&apos;: &apos;henrik.edin@mongodb.com&apos;, &apos;username&apos;: &apos;henrikedin&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-53436&quot; title=&quot;Transition to primary writes minValid doc with timestamp lastApplied with readers on the same timestamp under lock free reads&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-53436&quot;&gt;&lt;del&gt;SERVER-53436&lt;/del&gt;&lt;/a&gt; Make writes to appliedThrough untimestamped to make it work with Lock Free Reads.&lt;/p&gt;

&lt;p&gt;This is safe because without EMRC=false we don&apos;t need this document for recovery and a clean shutdown would be required for a downgrade.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d3cf593292806464e145868c08698c4593fc848c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d3cf593292806464e145868c08698c4593fc848c&lt;/a&gt;&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is depended on by">
                                        <issuelink>
            <issuekey id="1529834">SERVER-52221</issuekey>
        </issuelink>
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                            <issuelinktype id="10012">
                    <name>Related</name>
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            <issuekey id="1865500">SERVER-59721</issuekey>
        </issuelink>
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            <issuekey id="1583566">SERVER-53642</issuekey>
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