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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-22690] Short circuit mongos queries</title>
                <link>https://jira.mongodb.org/browse/SERVER-22690</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;For certain scenarios, such as finding a single document (without a sort) from mongos, mongos should immediately return results that are found (and before all shards respond).  &lt;/p&gt;

&lt;p&gt;E.g.&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;mongos &amp;gt; db.col.find( { &quot;_id&quot; : 123 } ).limit(1)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Short circuiting from mongos should only occur when a limit is placed on the query, and with no sort.&lt;/p&gt;</description>
                <environment></environment>
        <key id="266140">SERVER-22690</key>
            <summary>Short circuit mongos queries</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="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-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="jason.zucchetto">Jason Zucchetto</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 Feb 2016 16:56:18 +0000</created>
                <updated>Tue, 6 Dec 2022 04:33:04 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="1176242" author="david.storch" created="Wed, 17 Feb 2016 20:01:36 +0000"  >&lt;p&gt;At least in 3.2, mongos will always wait for responses from every targeted shard before returning the first batch to the user. We do this in order to ensure that we have successfully established the shard version on every node. (It isn&apos;t always correct to start returning results to the client until the shard version is fully established.) This optimization requires that we have knowledge of when it is safe to start returning results before hearing from other nodes. I think we can do this as long as there isn&apos;t a sort?&lt;/p&gt;</comment>
                            <comment id="1176228" author="spencer" created="Wed, 17 Feb 2016 19:51:27 +0000"  >&lt;p&gt;My impression was that we already did this, though I have not confirmed.  &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jason.zucchetto&quot; class=&quot;user-hover&quot; rel=&quot;jason.zucchetto&quot;&gt;jason.zucchetto&lt;/a&gt;, what makes you think this isn&apos;t the existing behavior?&lt;/p&gt;</comment>
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