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    <title>MongoDB Jira</title>
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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-12219] Use of $isolated inhibits query by id runner selection</title>
                <link>https://jira.mongodb.org/browse/SERVER-12219</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Normally, a query like &lt;/p&gt;
{ _id : 1 }
&lt;p&gt; will be routed to the &quot;id hack&quot; query runner. However, if the query is marked isolated with &lt;/p&gt;
{ _id : 1, $isolated : 1 }
&lt;p&gt;, then the query execution is routed through QueryPlanner::plan, rather than redirected to the id hack runner, which greatly reduces performance.&lt;/p&gt;</description>
                <environment></environment>
        <key id="103999">SERVER-12219</key>
            <summary>Use of $isolated inhibits query by id runner selection</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                            <label>Performance</label>
                    </labels>
                <created>Tue, 31 Dec 2013 04:42:21 +0000</created>
                <updated>Mon, 11 Jul 2016 17:37:52 +0000</updated>
                            <resolved>Fri, 10 Jan 2014 18:06:15 +0000</resolved>
                                                    <fixVersion>2.5.5</fixVersion>
                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="480250" author="xgen-internal-githook" created="Fri, 10 Jan 2014 17:01:09 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;dstorch&apos;, u&apos;name&apos;: u&apos;David Storch&apos;, u&apos;email&apos;: u&apos;david.storch@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-12219&quot; title=&quot;Use of $isolated inhibits query by id runner selection&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-12219&quot;&gt;&lt;del&gt;SERVER-12219&lt;/del&gt;&lt;/a&gt; allow idhack with $isolated&lt;/p&gt;

&lt;p&gt;Signed-off-by: Matt Kangas &amp;lt;matt.kangas@mongodb.com&amp;gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/dd17ec43de5d4a716995ef3ed57220dac62b382f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/dd17ec43de5d4a716995ef3ed57220dac62b382f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="479405" author="acm" created="Thu, 9 Jan 2014 04:13:57 +0000"  >&lt;p&gt;It is syntactically valid, so while it may be redundant for a query by _id, it should be harmless to specify it, but it currently is harmful. The alternative would be to forbid it, but on what basis?&lt;/p&gt;</comment>
                            <comment id="479396" author="asya" created="Thu, 9 Jan 2014 03:10:56 +0000"  >&lt;p&gt;$isolated doesn&apos;t make sense for a query by _id.  the point of $isolated is to not yield between multiple document updates (for example).  How can $isolated make sense with _id which by definition will only match one document?&lt;/p&gt;</comment>
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                            <customfieldvalue>&lt;p&gt;Run an _id query driven workload under &apos;perf top&apos;, and notice the IDHackRunner in the output. Re-run with $isolated, and note that the IDHackRunner goes away, and the QueryPlanner::plan function appears. Also, if you measure throughput, it is noticeably slower.&lt;/p&gt;</customfieldvalue>

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