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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-52628] Tenant migration recipient can give a false indication to donor about the data being majority committed on recipient replica set. </title>
                <link>https://jira.mongodb.org/browse/SERVER-52628</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51246&quot; title=&quot;Write a noop into the oplog buffer after each batch to ensure tenant applier reaches stop timestamp&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51246&quot;&gt;&lt;del&gt;SERVER-51246&lt;/del&gt;&lt;/a&gt;, future result returned by TenantOplogApplier::&lt;a href=&quot;https://github.com/mongodb/mongo/blob/c057a62e0a7968e848fc1b7c15951df6095c5d31/src/mongo/db/repl/tenant_oplog_applier.cpp#L89&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;getNotificationForOpTime()&lt;/a&gt; can have recipient ts as Null. This can result in tenant migration recipient giving a false indication to donor about the data being majority committed on recipient replica set. Consider the below case.&lt;br/&gt;
1) Tenant oplog applier applies a first batch containing one entry {_id:1}  at donor TS(1) for tenant &apos;foo&apos;. This would result in recipient write, say, TS(11). So, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c057a62e0a7968e848fc1b7c15951df6095c5d31/src/mongo/db/repl/tenant_oplog_applier.cpp#L222&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;_lastBatchCompletedOpTimes&lt;/a&gt;.donorOpTime is  TS(1) and _lastBatchCompletedOpTimes.recipientOpTime is TS(11).&lt;br/&gt;
2) Tenant oplog applier applies second batch containing one resume token no-op entry {op: n, ..}  at donor TS(2). This would result in no recipient writes. So, _lastBatchCompletedOpTimes.donorOpTime is TS(2) and _lastBatchCompletedOpTimes.recipientOpTime is TS(0).&lt;br/&gt;
3) Assume, now, recipient gets &quot;recipientSyncData&quot; cmd with returnAfterReachingDonorTimestamp set to TS(2). This results in calling Instance::waitUntilTimestampIsMajorityCommitted(), waits on a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/c057a62e0a7968e848fc1b7c15951df6095c5d31/src/mongo/db/repl/tenant_migration_recipient_service.cpp#L234&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;null recipient ts&lt;/a&gt; returned in the future result.&lt;/p&gt;

&lt;p&gt;As a result, we don&apos;t make sure all data &amp;lt;= Donor TS(2) is majority committed on replica set.&lt;/p&gt;



</description>
                <environment></environment>
        <key id="1534352">SERVER-52628</key>
            <summary>Tenant migration recipient can give a false indication to donor about the data being majority committed on recipient replica set. </summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="suganthi.mani@mongodb.com">Suganthi Mani</assignee>
                                    <reporter username="suganthi.mani@mongodb.com">Suganthi Mani</reporter>
                        <labels>
                            <label>pm-1791_milestone-B</label>
                    </labels>
                <created>Thu, 5 Nov 2020 03:45:38 +0000</created>
                <updated>Sun, 29 Oct 2023 22:00:50 +0000</updated>
                            <resolved>Fri, 6 Nov 2020 18:45:06 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3480006" author="xgen-internal-githook" created="Fri, 6 Nov 2020 18:42:45 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Suganthi Mani&apos;, &apos;email&apos;: &apos;suganthi.mani@mongodb.com&apos;, &apos;username&apos;: &apos;smani87&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-52628&quot; title=&quot;Tenant migration recipient can give a false indication to donor about the data being majority committed on recipient replica set. &quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-52628&quot;&gt;&lt;del&gt;SERVER-52628&lt;/del&gt;&lt;/a&gt; Tenant migration recipient no longer gives a false indication to donor about the data being majority committed on recipient replica set.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d6c15c62c4335266dfd30336ae1cf582b84e09ac&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d6c15c62c4335266dfd30336ae1cf582b84e09ac&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3476959" author="suganthi.mani" created="Thu, 5 Nov 2020 03:47:28 +0000"  >&lt;p&gt;FYI, Filed the ticket based on &lt;a href=&quot;https://mongodbcr.appspot.com/661730001/diff/661740001/src/mongo/db/repl/tenant_oplog_applier.cpp#newcode98&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this&lt;/a&gt; CR conversation&lt;/p&gt;</comment>
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