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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-82218] Unify explain and execution path in sharded_agg_helpers</title>
                <link>https://jira.mongodb.org/browse/SERVER-82218</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In sharded aggregations, explain() uses slightly different code to target shards than actual execution.&lt;/p&gt;



&lt;p&gt;explain() uses scatterGather functions: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62b3b9a2d52afeae975c9c6dbb0430c77b72a055/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1214&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/62b3b9a2d52afeae975c9c6dbb0430c77b72a055/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1214&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This functions re-do the shard targeting, that is already done at this point.&lt;/p&gt;

&lt;p&gt;But execution path uses establishShardCursors function that just attaches shard and db version to the remote command and wraps the result into RemoteCursor: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/62b3b9a2d52afeae975c9c6dbb0430c77b72a055/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1242&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/62b3b9a2d52afeae975c9c6dbb0430c77b72a055/src/mongo/db/pipeline/sharded_agg_helpers.cpp#L1242&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This can lead to differences between explain() output and what actually happens.&lt;/p&gt;

&lt;p&gt;We should use a single function to do both things and only do targeting once.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Instead of having a separate function to do RemoteCursors and explain commands, we just need a single function to send out requests and a separate function to wrap results in RemoteCursors.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2475300">SERVER-82218</key>
            <summary>Unify explain and execution path in sharded_agg_helpers</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="ivan.fefer@mongodb.com">Ivan Fefer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Oct 2023 14:31:17 +0000</created>
                <updated>Fri, 17 Nov 2023 12:48:35 +0000</updated>
                            <resolved>Thu, 9 Nov 2023 15:16:41 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5867905" author="xgen-internal-githook" created="Thu, 9 Nov 2023 15:15:07 +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-82218&quot; title=&quot;Unify explain and execution path in sharded_agg_helpers&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-82218&quot;&gt;&lt;del&gt;SERVER-82218&lt;/del&gt;&lt;/a&gt; Unify per shard command creation logic in sharded_agg_helpers.cpp&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5da5943203ce822b3491d694b7d46e8d07adb07e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5da5943203ce822b3491d694b7d46e8d07adb07e&lt;/a&gt;&lt;/p&gt;</comment>
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                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="479343">SERVER-32563</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="2483735">SERVER-82471</issuekey>
        </issuelink>
                            </outwardlinks>
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                                        <issuelink>
            <issuekey id="390325">SERVER-29449</issuekey>
        </issuelink>
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