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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-9205] MongoS does not re-write $in queries which results in all terms in $in array being sent to all shards</title>
                <link>https://jira.mongodb.org/browse/SERVER-9205</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In sharded environment, a query like&lt;br/&gt;
{_id : {$in : &lt;span class=&quot;error&quot;&gt;&amp;#91;100, 200, 300, 400, 500, 600...&amp;#93;&lt;/span&gt;}}&lt;br/&gt;
needs to be re-written by mongos by first resolving each _id value to the shard based on shard key (provided the shard key can be deduced from the query) and then sending corresponding sub-qery to the right shard.&lt;br/&gt;
Example, if 100, 300, 500 belong to shard1 and 200, 400, 600 belong to shard2 MongoS needs to make exactly 2 queries:&lt;br/&gt;
{_id : {$in : &lt;span class=&quot;error&quot;&gt;&amp;#91;100, 300, 500&amp;#93;&lt;/span&gt;}}&lt;br/&gt;
to shard1&lt;br/&gt;
and&lt;br/&gt;
{_id : {$in : &lt;span class=&quot;error&quot;&gt;&amp;#91;200, 400, 600&amp;#93;&lt;/span&gt;}}&lt;br/&gt;
to shard2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="70415">SERVER-9205</key>
            <summary>MongoS does not re-write $in queries which results in all terms in $in array being sent to all shards</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="3">Duplicate</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="antoine">Antoine Girbal</reporter>
                        <labels>
                    </labels>
                <created>Mon, 1 Apr 2013 22:03:53 +0000</created>
                <updated>Fri, 31 Jan 2014 19:37:42 +0000</updated>
                            <resolved>Mon, 1 Apr 2013 22:12:46 +0000</resolved>
                                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="303656" author="antoine" created="Mon, 1 Apr 2013 22:48:31 +0000"  >&lt;p&gt;hey Eliot, just note that the new ticket is more about filtering the $in&lt;br/&gt;
list rather than just selecting the right shards.&lt;br/&gt;
From talking to Greg, sounds like at this time we dont query the shards&lt;br/&gt;
that dont have any related data, so part of.&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4960&quot; title=&quot;Optimize shard selection on $in queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4960&quot;&gt;SERVER-4960&lt;/a&gt; is already&lt;br/&gt;
implemented &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/help_16.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;br/&gt;
thanks&lt;/p&gt;






&lt;p&gt;&amp;#8211; &lt;/p&gt;
{ name     : &quot;Girbal Antoine&quot;,
  title    : &quot;Technical Account Manager Lead&quot;,
  phone    : &quot;408.355.0767&quot;,
  location : &quot;Palo Alto, CA&quot;,
  twitter  : [&quot;@MongoDB&quot;, &quot;@10gen&quot;],
  facebook : [&quot;MongoDB&quot;, &quot;10gen&quot;] }</comment>
                            <comment id="303638" author="eliot" created="Mon, 1 Apr 2013 22:12:46 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4960&quot; title=&quot;Optimize shard selection on $in queries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4960&quot;&gt;SERVER-4960&lt;/a&gt;&lt;/p&gt;</comment>
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