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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>
    </build-info>


<item>
            <title>[SERVER-80370] Fix shardingStatistics&apos; numHostsTargeted for tracked unsharded collections</title>
                <link>https://jira.mongodb.org/browse/SERVER-80370</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;NumHostsTargetedMetrics::parseTargetType &lt;a href=&quot;https://github.com/mongodb/mongo/blob/2d340534b1acce98965b7ef9ccc96f3a73c3a86e/src/mongo/s/client/num_hosts_targeted_metrics.cpp#L100-L101&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;only returns &apos;kUnsharded&apos; when there is no routing table&lt;/a&gt; (i.e. no chunks). However, tracked unsharded collections do have a routing table. This may cause operations on such collections to be accounted as &apos;oneShard&apos; operations, rather than the expected &apos;unsharded&apos;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2425158">SERVER-80370</key>
            <summary>Fix shardingStatistics&apos; numHostsTargeted for tracked unsharded collections</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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.olivares-provencio@mongodb.com">Jordi Olivares Provencio</assignee>
                                    <reporter username="jordi.serra-torrens@mongodb.com">Jordi Serra Torrens</reporter>
                        <labels>
                            <label>oldshardingemea</label>
                    </labels>
                <created>Thu, 24 Aug 2023 08:44:55 +0000</created>
                <updated>Thu, 18 Jan 2024 14:29:15 +0000</updated>
                            <resolved>Thu, 18 Jan 2024 14:29:15 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="6021919" author="xgen-internal-githook" created="Thu, 18 Jan 2024 13:17:30 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Jordi Olivares Provencio&apos;, &apos;email&apos;: &apos;jordi.olivares-provencio@mongodb.com&apos;, &apos;username&apos;: &apos;jordiolivares&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-80370&quot; title=&quot;Fix shardingStatistics&amp;#39; numHostsTargeted for tracked unsharded collections&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-80370&quot;&gt;&lt;del&gt;SERVER-80370&lt;/del&gt;&lt;/a&gt; Fix shardingStatistics&apos; numHostsTargeted for tracked unsharded collections (#17941)&lt;/p&gt;

&lt;p&gt;GitOrigin-RevId: cd9d0a9309625f98b168f9cb83a69d2d0037717a&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/b6d56dadcab4e4a4cd9cffb8e7ceb45906178de6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/b6d56dadcab4e4a4cd9cffb8e7ceb45906178de6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5966083" author="JIRAUSER1257318" created="Thu, 21 Dec 2023 16:08:22 +0000"  >&lt;p&gt;This ticket refers to the following serverStatus section on mongos:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  shardingStatistics: {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    numHostsTargeted: {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      find: { allShards: 0, manyShards: 0, oneShard: 0, unsharded: 2 },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      insert: { allShards: 0, manyShards: 0, oneShard: 0, unsharded: 0 },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      update: { allShards: 0, manyShards: 0, oneShard: 0, unsharded: 0 },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      delete: { allShards: 0, manyShards: 0, oneShard: 0, unsharded: 0 },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;      aggregate: { allShards: 0, manyShards: 0, oneShard: 0, unsharded: 0 }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    },&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Specifically around the fact that operations on &quot;tracked unsharded collections&quot; now are tracked as &apos;oneShard&apos; instead of &apos;unsharded&apos;. I&apos;d say that this represents a change in reporting semantics.&lt;/p&gt;</comment>
                            <comment id="5941049" author="JIRAUSER1264163" created="Mon, 11 Dec 2023 16:59:21 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jordi.serra-torrens%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;jordi.serra-torrens@mongodb.com&quot;&gt;jordi.serra-torrens@mongodb.com&lt;/a&gt; This change involves changing the semantics for the metrics produced by aggregations in a confusing manner for users.&lt;/p&gt;

&lt;p&gt;Right now aggregations assumes that unsharded collections reside on the dbPrimary since the method &lt;a href=&quot;https://github.com/mongodb/mongo/blob/bb163fb33e81abee32aad04a353a71a74934825f/src/mongo/s/query/cluster_aggregate.cpp#L192&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;returns an empty set of chunk owning shards if they are unsharded&lt;/a&gt;. The problem with now assuming that chunks can exist on other shards is that maintaining this semantic is confusing since we&apos;re now potentially performing distributed computations (think aggregation on two unsharded collections) but then going back to the user and saying we are targeting unsharded collections but not saying if they resided on the same shard or not. Is there any reason we wouldn&apos;t want to remove the notion of unsharded host targetting altogether instead and just explain to the user we are contacting 1/Some/All shards?&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="2445899">SERVER-81190</issuekey>
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