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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-68366] Avoid change streams broadcasting {fullDocument: &quot;updateLookup&quot;} queries to all shards when shard key field is missing</title>
                <link>https://jira.mongodb.org/browse/SERVER-68366</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;MongoDB 4.4 enabled documents in a sharded collection to omit any or all of the shard key fields (&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-42390&quot; title=&quot;Allow documents in a sharded collection to not contain all shard key fields&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-42390&quot;&gt;&lt;del&gt;SERVER-42390&lt;/del&gt;&lt;/a&gt;). ShardServerProcessInterface::lookupSingleDocument() ends up &lt;a href=&quot;https://github.com/mongodb/mongo/blob/629d8e1868efd0ca5e45ab974cc44e297f243150/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L488&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;passing the document key directly into a $match stage&lt;/a&gt;. This means change streams may run a {_id: &quot;hello&quot;} query on a collection sharded by {a: 1, b: 1} and end up broadcasting the query to all shards to find the matching one.&lt;/p&gt;

&lt;p&gt;Note that technically because change streams isn&apos;t reading at a single point&amp;#45;in&amp;#45;time across all of these shards it is technically possible for it to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/629d8e1868efd0ca5e45ab974cc44e297f243150/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L495&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;find multiple matching documents&lt;/a&gt; from the document being deleted + inserted across shards (e.g. from the shard key value being updated). This would lead to a ChangeStreamFatalError response.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2100919">SERVER-68366</key>
            <summary>Avoid change streams broadcasting {fullDocument: &quot;updateLookup&quot;} queries to all shards when shard key field is missing</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-execution">Backlog - Query Execution</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Wed, 27 Jul 2022 19:44:06 +0000</created>
                <updated>Mon, 5 Dec 2022 23:53:44 +0000</updated>
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