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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-75634] The logic in attachCursorSourceToPipelineForLocalRead performs shard versioning by UUID</title>
                <link>https://jira.mongodb.org/browse/SERVER-75634</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The logic in &lt;a href=&quot;https://github.com/mongodb/mongo/blob/11a5a961e255e9c07b1068bd702d57daa15ec33e/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L437&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;CommonMongodProcessInterface::attachCursorSourceToPipelineForLocalRead&lt;/tt&gt;&lt;/a&gt; performs shard versioning by &lt;a href=&quot;https://github.com/mongodb/mongo/blob/11a5a961e255e9c07b1068bd702d57daa15ec33e/src/mongo/db/pipeline/process_interface/common_mongod_process_interface.cpp#L468-L469&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;UUID&lt;/a&gt;, even if namespace is available. The shard version comes from the previous call up the stack, which &lt;a href=&quot;https://github.com/mongodb/mongo/blob/11a5a961e255e9c07b1068bd702d57daa15ec33e/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1639-L1654&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;establishes the collection&lt;/a&gt; as expected UNSHARDED.&lt;/p&gt;

&lt;p&gt;There are a couple of problems with this:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Shard versioning by UUID is not something that we currently support in the protocol, unless the version is UNSHARDED. The protocol is always NSS -&amp;gt; ShardVersion and if instead of NSS we have UUID, there is currently no reliable way to infer what is the namespace that corresponds to that collection and we need to rely on the contents of the local catalog.&lt;/li&gt;
	&lt;li&gt;We plan to get rid of UNSHARDED collections, which means this problem will get worse.&lt;/li&gt;
&lt;/ol&gt;
</description>
                <environment></environment>
        <key id="2305861">SERVER-75634</key>
            <summary>The logic in attachCursorSourceToPipelineForLocalRead performs shard versioning by UUID</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="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</assignee>
                                    <reporter username="kaloian.manassiev@mongodb.com">Kaloian Manassiev</reporter>
                        <labels>
                    </labels>
                <created>Tue, 4 Apr 2023 06:09:19 +0000</created>
                <updated>Sun, 29 Oct 2023 21:23:42 +0000</updated>
                            <resolved>Tue, 25 Jul 2023 12:49:51 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                    <fixVersion>7.0.2</fixVersion>
                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5658724" author="xgen-internal-githook" created="Fri, 25 Aug 2023 09:40:19 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75634&quot; title=&quot;The logic in attachCursorSourceToPipelineForLocalRead performs shard versioning by UUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75634&quot;&gt;&lt;del&gt;SERVER-75634&lt;/del&gt;&lt;/a&gt; Make attachCursorSourceToPipelineForLocalRead acquire collection by namespace string&lt;br/&gt;
Branch: v7.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/41e3984aa35c507ad4c5cb6906fec9a329c4cf6c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/41e3984aa35c507ad4c5cb6906fec9a329c4cf6c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5589313" author="xgen-internal-githook" created="Tue, 25 Jul 2023 12:48:40 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Serra Torrens&apos;, &apos;email&apos;: &apos;jordi.serra-torrens@mongodb.com&apos;, &apos;username&apos;: &apos;jordist&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-75634&quot; title=&quot;The logic in attachCursorSourceToPipelineForLocalRead performs shard versioning by UUID&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-75634&quot;&gt;&lt;del&gt;SERVER-75634&lt;/del&gt;&lt;/a&gt; Make attachCursorSourceToPipelineForLocalRead acquire collection by namespace string&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6918ea89e3d9f540e49837513e0246584b373099&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6918ea89e3d9f540e49837513e0246584b373099&lt;/a&gt;&lt;/p&gt;</comment>
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