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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-80699] Chunk migration can incorrectly skip oplog entries written from a mixed-namespace bulkWrite command</title>
                <link>https://jira.mongodb.org/browse/SERVER-80699</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently there is an &lt;a href=&quot;https://github.com/mongodb/mongo/blob/6f7a051255ca8b594da4e229a91f70df916a556c/src/mongo/db/s/session_catalog_migration_source.cpp#L588-L594&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;optimization&lt;/a&gt; in the chunk migration code where if the source sees that an oplog entry for a session has a different namespace than the one being migrated, it skips inspecting the rest of the oplog chain, with the assumption that all entries in the chain will be for a single namespace.&lt;/p&gt;

&lt;p&gt;Unfortunately that assumption no longer holds up for bulkWrite since a single retryable write can now touch multiple namespaces. And so if for example we have an oplog chain (from newest to oldest) generated from a single retryable bulkWrite with:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;write to coll1&lt;/li&gt;
	&lt;li&gt;write to coll2&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;And we are migrating coll2, we would see that the first entry is on a different ns and skip the rest of the chain.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2432942">SERVER-80699</key>
            <summary>Chunk migration can incorrectly skip oplog entries written from a mixed-namespace bulkWrite command</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="sean.zimmerman@mongodb.com">Sean Zimmerman</assignee>
                                    <reporter username="kaitlin.mahar@mongodb.com">Kaitlin Mahar</reporter>
                        <labels>
                            <label>milestone-2</label>
                    </labels>
                <created>Fri, 1 Sep 2023 20:42:30 +0000</created>
                <updated>Fri, 19 Jan 2024 14:15:43 +0000</updated>
                            <resolved>Fri, 19 Jan 2024 14:15:42 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="6024441" author="xgen-internal-githook" created="Fri, 19 Jan 2024 00:18:59 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;seanzimm&apos;, &apos;email&apos;: &apos;102551488+seanzimm@users.noreply.github.com&apos;, &apos;username&apos;: &apos;seanzimm&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80699&quot; title=&quot;Chunk migration can incorrectly skip oplog entries written from a mixed-namespace bulkWrite command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80699&quot;&gt;&lt;del&gt;SERVER-80699&lt;/del&gt;&lt;/a&gt;: Fix Chunk Migrations Optimization for bulkWrite (#16134)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 0dea85bbb35079a795b4e1d4845e9527849a4b87&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/a65d5122c87dd316ae06b497f7044b9647574bc7&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/a65d5122c87dd316ae06b497f7044b9647574bc7&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2434087">SERVER-80729</issuekey>
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