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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-28678] The explain command should reject explained commands containing readConcern or writeConcern</title>
                <link>https://jira.mongodb.org/browse/SERVER-28678</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, the explain command ignores any readConcern or writeConcern fields contained in the explained commands:&lt;/p&gt;

&lt;p/&gt;
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					&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;MongoDB Enterprise &amp;gt; db.runCommand({ &quot;explain&quot; : { &quot;find&quot; : &quot;test&quot;, &quot;readConcern&quot; : { &quot;level&quot; : &quot;local&quot; } } })&lt;/span&gt;&lt;/pre&gt;
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						&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;{&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&lt;/pre&gt;
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					&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;MongoDB Enterprise &amp;gt; db.runCommand({ &quot;explain&quot; : { &quot;delete&quot; : &quot;test&quot;, deletes : [{q : {x : 1}, limit : 1}], &quot;writeConcern&quot; : { w : 1 } } })&lt;/span&gt;&lt;/pre&gt;
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						&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;{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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			&lt;/td&gt;
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			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;Consider rejecting these commands, as read/write concern are not relevant to evaluating the query plan.&lt;/p&gt;

&lt;p&gt;This would be a minor backwards breaking change for drivers, some of which currently would send an explain command with read/write concern fields present in the explained command.&lt;/p&gt;</description>
                <environment></environment>
        <key id="372014">SERVER-28678</key>
            <summary>The explain command should reject explained commands containing readConcern or writeConcern</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="jeff.yemin@mongodb.com">Jeffrey Yemin</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 Apr 2017 16:56:58 +0000</created>
                <updated>Mon, 29 May 2023 16:59:02 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5458827" author="xgen-internal-githook" created="Mon, 29 May 2023 16:59:02 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;J&#233;r&#244;me Tamarelle&apos;, &apos;email&apos;: &apos;jerome.tamarelle@mongodb.com&apos;, &apos;username&apos;: &apos;GromNaN&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/PHPLIB-802&quot; title=&quot;Send readConcern but not writeConcern to explain commands&quot; class=&quot;issue-link&quot; data-issue-key=&quot;PHPLIB-802&quot;&gt;&lt;del&gt;PHPLIB-802&lt;/del&gt;&lt;/a&gt;: Send readConcern but not writeConcern to explain commands (#1080)&lt;/p&gt;

&lt;p&gt;ReadConcern is relevant for query plan evaluation, not WriteConcern. The option is sent only for operations that support ReadConcern.&lt;br/&gt;
&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-28678?focusedCommentId=3457279&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-3457279&quot; class=&quot;external-link&quot; rel=&quot;nofollow&quot;&gt;https://jira.mongodb.org/browse/SERVER-28678?focusedCommentId=3457279&amp;amp;page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-3457279&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-php-library/commit/118f08409fec7ce8be8664dc7bea0803842f8d2c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-php-library/commit/118f08409fec7ce8be8664dc7bea0803842f8d2c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3457279" author="asya" created="Wed, 21 Oct 2020 19:35:20 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeff.yemin&quot; class=&quot;user-hover&quot; rel=&quot;jeff.yemin&quot;&gt;jeff.yemin&lt;/a&gt; that&apos;s not right:&lt;/p&gt;

&lt;p&gt;&amp;gt; read/write concern are not relevant to evaluating the query plan&lt;/p&gt;

&lt;p&gt;Read concern &lt;tt&gt;available&lt;/tt&gt; (as opposed to local) does not use SHARDING_FILTER so the plan &lt;b&gt;would&lt;/b&gt; be different.&lt;/p&gt;</comment>
                    </comments>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="2023456">NODE-4184</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="1880861">MONGOSH-1002</issuekey>
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            <issuelink>
            <issuekey id="1991752">PHPLIB-802</issuekey>
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