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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-85914] Inspect all usages of CollectionMetadata::getChunkManager() and hide it from the public API</title>
                <link>https://jira.mongodb.org/browse/SERVER-85914</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ebd80c333f4d316c94b6d65eaa6b3bdac1c45c3c/src/mongo/db/s/collection_metadata.h#L226-L229&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CollectionMetadata::getChunkManager()&lt;/tt&gt;&lt;/a&gt; method exposes internal implementation detail of the ownership state of the shard role. This detail is dangerous to use, because it happens to also contain the ownership state of other shards without any guarantee of its stability.&lt;/p&gt;

&lt;p&gt;For example, &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ebd80c333f4d316c94b6d65eaa6b3bdac1c45c3c/src/mongo/db/s/migration_source_manager.cpp#L465-L467&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this piece of code&lt;/a&gt; makes a correctness-critical assumption for change streams, based on cached (and possibly stale) information that the recipient of a chunk doesn&apos;t contain any data. This is not correct to do, because between the time the &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ebd80c333f4d316c94b6d65eaa6b3bdac1c45c3c/src/mongo/db/s/migration_source_manager.cpp#L226&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;donor recovers&lt;/a&gt; its ownership information and the time this check is performed, there is no guarantee that the recipient hasn&apos;t received something or lost all its chunks.&lt;/p&gt;

&lt;p&gt;The goal of this ticket is to:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Inspect all calls to &lt;tt&gt;CollectionMetadata::getChunkManager()&lt;/tt&gt; and if they legitimately only look at ranges owned by the shard (shard role usage), place them as semantic operations on the &lt;tt&gt;ScopedCollectionOwnershipFilter&lt;/tt&gt; similar to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/ebd80c333f4d316c94b6d65eaa6b3bdac1c45c3c/src/mongo/db/s/scoped_collection_metadata.h#L137&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this one&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;If they look at ranges that are not owned by the shard, file SERVER tickets explaining the bugs that this may lead to, the versions impacted and relate them to this ticket (e.g. &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-85914&quot; title=&quot;Inspect all usages of CollectionMetadata::getChunkManager() and hide it from the public API&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-85914&quot;&gt;SERVER-85914&lt;/a&gt;).&lt;/li&gt;
	&lt;li&gt;Hide &lt;tt&gt;CollectionMetadata::getChunkManager()&lt;/tt&gt; from the public section of &lt;tt&gt;CollectionMetadata&lt;/tt&gt;.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2560731">SERVER-85914</key>
            <summary>Inspect all usages of CollectionMetadata::getChunkManager() and hide it from the public API</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="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-server-catalog-and-routing">Backlog - Catalog and Routing</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                            <label>car-investigation</label>
                    </labels>
                <created>Tue, 30 Jan 2024 09:22:31 +0000</created>
                <updated>Mon, 5 Feb 2024 07:12:54 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>1</watches>
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            <issuekey id="2543310">SERVER-84761</issuekey>
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