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    <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-84470] Allow $lookup to target an unsplittable collection on a primary shard within a multi-document transaction</title>
                <link>https://jira.mongodb.org/browse/SERVER-84470</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As explained in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46373&quot; title=&quot;Allow an aggregation sub-operation on a shard to target itself when running in a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46373&quot;&gt;SERVER-46373&lt;/a&gt; currently $lookup is not allowed to target a sharded collection in a multi document transaction due to 2 known reasons:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;That a shard targeting itself will deadlock trying to re-acquire the same session&lt;/li&gt;
	&lt;li&gt;That if a different shard needs to be targeted, the shard does not know how to correctly start the multi-doc txn on that other shard.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;After &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81190&quot; title=&quot;Support tracking &amp;quot;simple&amp;quot; unsharded collections in the sharding catalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81190&quot;&gt;&lt;del&gt;SERVER-81190&lt;/del&gt;&lt;/a&gt; unsharded collection will be tracked and $lookup as a consequence won&apos;t be allowed on a unsharded collection as well (within a transaction)&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to allow $lookup on an unsplittable collection if that collection is still on the primary. This is just a temporary fix before &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46373&quot; title=&quot;Allow an aggregation sub-operation on a shard to target itself when running in a transaction&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46373&quot;&gt;SERVER-46373&lt;/a&gt; to enable &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81190&quot; title=&quot;Support tracking &amp;quot;simple&amp;quot; unsharded collections in the sharding catalog&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81190&quot;&gt;&lt;del&gt;SERVER-81190&lt;/del&gt;&lt;/a&gt; to be merged and start tracking collections.&lt;/p&gt;</description>
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        <key id="2535111">SERVER-84470</key>
            <summary>Allow $lookup to target an unsplittable collection on a primary shard within a multi-document transaction</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="10033" iconUrl="https://jira.mongodb.org/images/icons/statuses/information.png" description="Status for tickets that need to be escalated and unblocked on our team.">Blocked</status>
                    <statusCategory id="4" key="indeterminate" colorName="inprogress"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="jordi.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="enrico.golfieri@mongodb.com">Enrico Golfieri</reporter>
                        <labels>
                    </labels>
                <created>Tue, 2 Jan 2024 14:51:36 +0000</created>
                <updated>Tue, 6 Feb 2024 14:03:53 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>3</watches>
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            <issuekey id="2544558">SERVER-85165</issuekey>
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