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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-84723] Sharded multi-document transactions can observe partial effects of concurrent DDL operations</title>
                <link>https://jira.mongodb.org/browse/SERVER-84723</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Consider the following interleaving (repro1.js):&lt;br/&gt;
1. Initial state:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;collA: sharded collection with chunks both on shard0 and shard1.&lt;/li&gt;
	&lt;li&gt;collB: unsharded collection on shard0.&lt;/li&gt;
	&lt;li&gt;collC: does not exist.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;2. Start txn with local or majority read concern, hit shard0 to read collB &lt;span class=&quot;error&quot;&gt;&amp;#91;shard0&amp;#39;s txn snapshot has: ns1 and ns2&amp;#93;&lt;/span&gt;&lt;br/&gt;
3. Rename collA -&amp;gt; collC.&lt;br/&gt;
4. Read collC. On shard0, collC does not exist in the txn snapshot. On shard1 it will. Therefore the txn will see half the collection.&lt;/p&gt;

&lt;p&gt;Moreover, if collectionC existed initially, the transaction would observe a mix of the original collection and the post-rename collection.&lt;br/&gt;
The example above involves rename, but a similar situation might be possible with reshardCollection.&lt;/p&gt;

&lt;p&gt;Another anomaly is (repro2.js):&lt;br/&gt;
1. Initial state&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;shard0 (dbPrimary): collA(sharded) and collB(unsharded)&lt;/li&gt;
	&lt;li&gt;shard1: collA(sharded)&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;2. Start txn (local, majority or snapshot read concern), hit shard0 for collB&lt;br/&gt;
3. Drop collA&lt;br/&gt;
4. Read collA. Will target shard0, will read the sharded coll (but just half of it).&lt;/p&gt;</description>
                <environment></environment>
        <key id="2541863">SERVER-84723</key>
            <summary>Sharded multi-document transactions can observe partial effects of concurrent DDL operations</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                    </labels>
                <created>Wed, 10 Jan 2024 11:17:33 +0000</created>
                <updated>Thu, 1 Feb 2024 13:33:12 +0000</updated>
                            <resolved>Wed, 31 Jan 2024 16:59:11 +0000</resolved>
                                    <version>7.0.0</version>
                                    <fixVersion>8.0.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>19</watches>
                                                                                                                <comments>
                            <comment id="6056391" author="xgen-internal-githook" created="Wed, 31 Jan 2024 16:49:47 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordist@users.noreply.github.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-84723&quot; title=&quot;Sharded multi-document transactions can observe partial effects of concurrent DDL operations&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-84723&quot;&gt;&lt;del&gt;SERVER-84723&lt;/del&gt;&lt;/a&gt; Ensure sharding catalog is valid when acquiring collections in multi-document transactions (#18193)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: 3a7b1e4f29dfae062ad1ef904280a1e40d0a411c&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/03be106d1749971acc549bfc827e3d59da57f526&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/03be106d1749971acc549bfc827e3d59da57f526&lt;/a&gt;&lt;/p&gt;</comment>
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                            <attachment id="502463" name="repro2.js" size="2830" author="jordi.serra-torrens@mongodb.com" created="Thu, 11 Jan 2024 14:04:54 +0000"/>
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