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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-77427] Avoid going through the network when a shard is targeting only itself for a $lookup subpipeline</title>
                <link>https://jira.mongodb.org/browse/SERVER-77427</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;This is meant to be a targeted improvement specific to $lookup, though depending on the implementation it could affect other commands which use &lt;tt&gt;sharded_agg_helpers::attachCursorToPipeline&lt;/tt&gt;, similar to&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-58376&quot; title=&quot;Perform local read when $lookup into unsharded coll is on primary shard&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-58376&quot;&gt;&lt;del&gt;SERVER-58376&lt;/del&gt;&lt;/a&gt;. When this work is done, we would expect to see improvement especially for $lookups where the local and foreign data is co-located (see workloads from PERF-4152)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2349361">SERVER-77427</key>
            <summary>Avoid going through the network when a shard is targeting only itself for a $lookup subpipeline</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="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="ivan.fefer@mongodb.com">Ivan Fefer</assignee>
                                    <reporter username="hana.pearlman@mongodb.com">Hana Pearlman</reporter>
                        <labels>
                            <label>pm3229-m1</label>
                    </labels>
                <created>Wed, 24 May 2023 14:57:37 +0000</created>
                <updated>Wed, 10 Jan 2024 09:36:54 +0000</updated>
                            <resolved>Thu, 17 Aug 2023 08:47:35 +0000</resolved>
                                                    <fixVersion>7.1.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>15</watches>
                                                                                                                <comments>
                            <comment id="5731551" author="xgen-internal-githook" created="Tue, 26 Sep 2023 14:45:06 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Rushan Chen&apos;, &apos;email&apos;: &apos;rushan.chen@mongodb.com&apos;, &apos;username&apos;: &apos;ruchen&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77427&quot; title=&quot;Avoid going through the network when a shard is targeting only itself for a $lookup subpipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77427&quot;&gt;&lt;del&gt;SERVER-77427&lt;/del&gt;&lt;/a&gt; revert&lt;br/&gt;
Branch: v7.1&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/aae297113407b219885bfe44f25a1fb377e04557&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/aae297113407b219885bfe44f25a1fb377e04557&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5640592" author="kateryna.kamenieva" created="Thu, 17 Aug 2023 14:50:04 +0000"  >&lt;p&gt;&#127881;&lt;/p&gt;</comment>
                            <comment id="5639043" author="xgen-internal-githook" created="Wed, 16 Aug 2023 20:52:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ivan Fefer&apos;, &apos;email&apos;: &apos;ivan.fefer@mongodb.com&apos;, &apos;username&apos;: &apos;Fefer-Ivan&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-77427&quot; title=&quot;Avoid going through the network when a shard is targeting only itself for a $lookup subpipeline&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-77427&quot;&gt;&lt;del&gt;SERVER-77427&lt;/del&gt;&lt;/a&gt; Use local read if pipeline targets only local shard&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5c14aa402e3cbab58d8de1e891f00e91deb023e5&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5c14aa402e3cbab58d8de1e891f00e91deb023e5&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5602682" author="david.storch" created="Mon, 31 Jul 2023 17:20:10 +0000"  >&lt;p&gt;We should be able to apply this &quot;local reads&quot; optimization for the inner side of $lookup for the following cases:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;The collection is unsharded and untracked by the sharding catalog, but the $lookup is executing on the primary shard.&lt;/li&gt;
	&lt;li&gt;The collection is unsharded but tracked by the sharding catalog and is placed locally on the node where $lookup is executing.&lt;/li&gt;
	&lt;li&gt;The collection is sharded but all chunks are local.&lt;/li&gt;
	&lt;li&gt;The collection is sharded with chunks distributed across shards. But after targeting based on the query predicate, we find that the shard executing the $lookup only needs to target itself.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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