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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-55051] Tenant migration donor primaries should not serve local, majority, and causal reads after the migration has committed</title>
                <link>https://jira.mongodb.org/browse/SERVER-55051</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Tenant migrations were designed to allow donor nodes to serve local and majority reads even after the migration committed, since local and majority reads are allowed to serve stale data.&lt;/p&gt;

&lt;p&gt;While this will not cause unexpected behavior for secondary reads, it may be surprising for primary-only reads, since users expect reading and writing to the primary of a single replica set to have read-your-own-writes behavior, unless there is a split brain or failover. This is true even for causal reads, because drivers use implicit sessions by default, and causal consistency in sessions is &lt;a href=&quot;https://github.com/mongodb/specifications/blob/master/source/causal-consistency/causal-consistency.rst#causalconsistency&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;on by default&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Note that since local and majority reads are untimestamped, the donor primary will have to check if the migration has committed at the time the read starts, rather than comparing the read&apos;s timestamp to the blockTimestamp.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1643793">SERVER-55051</key>
            <summary>Tenant migration donor primaries should not serve local, majority, and causal reads after the migration has committed</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="lingzhi.deng@mongodb.com">Lingzhi Deng</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                            <label>pm-1791_non-cloud-blocking</label>
                            <label>pm-1791_optimizations</label>
                    </labels>
                <created>Mon, 8 Mar 2021 22:09:56 +0000</created>
                <updated>Sun, 29 Oct 2023 21:56:33 +0000</updated>
                            <resolved>Fri, 23 Apr 2021 14:26:47 +0000</resolved>
                                                    <fixVersion>4.9.0-rc1</fixVersion>
                    <fixVersion>5.0.0-rc0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3736793" author="xgen-internal-githook" created="Fri, 23 Apr 2021 21:47:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55051&quot; title=&quot;Tenant migration donor primaries should not serve local, majority, and causal reads after the migration has committed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55051&quot;&gt;&lt;del&gt;SERVER-55051&lt;/del&gt;&lt;/a&gt;: Donor should block non-timestamped reads after migration has committed&lt;/p&gt;

&lt;p&gt;(cherry picked from commit 16cb79e780c4101118fdd3253bcacf5d63be886f)&lt;br/&gt;
Branch: v4.9&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/8467c08ff3b6945b9e9e66652df31cd8174a42d0&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/8467c08ff3b6945b9e9e66652df31cd8174a42d0&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3734699" author="xgen-internal-githook" created="Fri, 23 Apr 2021 03:30:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Lingzhi Deng&apos;, &apos;email&apos;: &apos;lingzhi.deng@mongodb.com&apos;, &apos;username&apos;: &apos;ldennis&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-55051&quot; title=&quot;Tenant migration donor primaries should not serve local, majority, and causal reads after the migration has committed&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-55051&quot;&gt;&lt;del&gt;SERVER-55051&lt;/del&gt;&lt;/a&gt;: Donor should block non-timestamped reads after migration has committed&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/16cb79e780c4101118fdd3253bcacf5d63be886f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/16cb79e780c4101118fdd3253bcacf5d63be886f&lt;/a&gt;&lt;/p&gt;</comment>
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