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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-72623] Add a server comment in tenant oplog applier for shard merge oplog application mode &amp; isDataConsistent true value.</title>
                <link>https://jira.mongodb.org/browse/SERVER-72623</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When a recipient failover happens in the middle of tenant oplog application, we might resume applying those donor oplog entries from a point that was already applied due to the fact we first apply the donor oplog entries and then write no-op donor oplog entries for the given batch and we calculate the resume point by finding the latest no-op oplog entry .  So, with the stricter mode &apos;kSecondary&apos;, re-applying those donor oplog entries can cause failure and leads to shard merge failure unnecessarily. So, change the tenant oplog application mode to kInitialSync (lenient mode)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2227891">SERVER-72623</key>
            <summary>Add a server comment in tenant oplog applier for shard merge oplog application mode &amp; isDataConsistent true value.</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>shard-merge-milestone-3</label>
                    </labels>
                <created>Mon, 9 Jan 2023 15:47:12 +0000</created>
                <updated>Sun, 29 Oct 2023 21:28:32 +0000</updated>
                            <resolved>Wed, 8 Mar 2023 23:01:23 +0000</resolved>
                                                    <fixVersion>7.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="5259835" author="xgen-internal-githook" created="Wed, 8 Mar 2023 21:07:52 +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-72623&quot; title=&quot;Add a server comment in tenant oplog applier for shard merge oplog application mode &amp;amp; isDataConsistent true value.&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-72623&quot;&gt;&lt;del&gt;SERVER-72623&lt;/del&gt;&lt;/a&gt; Update the comment in tenant oplog applier about the data consistency.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b10e48f30d9e5833c4103cfa368dd1b907c389dd&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b10e48f30d9e5833c4103cfa368dd1b907c389dd&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5246850" author="suganthi.mani" created="Fri, 3 Mar 2023 14:34:02 +0000"  >&lt;p&gt;Shard Merge is not robust to donor/recipient failovers, restarts and rollbacks (&lt;a href=&quot;https://docs.google.com/document/d/1JzE_OfCV1sVwdKSODi6MQD6DOCvRLD18CjzUhapO52s/edit#bookmark=id.uyh71zyq695u&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;see&lt;/a&gt; the design doc).&lt;/p&gt;

&lt;p&gt; No fix is required, just to give clarity to future readers, add a comment &lt;a href=&quot;https://github.com/10gen/mongo/blob/d0a7b4e6b3c4ae2d356ce23996ecf3f7ed56ad9b/src/mongo/db/repl/tenant_oplog_applier.cpp#L1108&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;  on why it&apos;s ok to have isDataConsistent to true.&lt;/p&gt;</comment>
                            <comment id="5158577" author="suganthi.mani" created="Wed, 1 Feb 2023 14:16:10 +0000"  >&lt;p&gt;Note: As part of the ticket,  `isDataConsistent` should be set to false as data can be inconsistent on recipient failover during oplog catchup phase where we apply oplog entries in parallel. The side-effect of setting `isDataConsistent` is true is that we might record pre/post images of change streams and rFAM wrongly (See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-69001&quot; title=&quot;Initial sync should set the minValid document to the &amp;quot;stopTimestamp&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-69001&quot;&gt;&lt;del&gt;SERVER-69001&lt;/del&gt;&lt;/a&gt;). &lt;/p&gt;</comment>
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            <issuekey id="2227873">SERVER-72622</issuekey>
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