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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-20267] Upconvert $explain option for OP_QUERY find to an explain command on mongos</title>
                <link>https://jira.mongodb.org/browse/SERVER-20267</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, if an OP_QUERY find is redirected to the new mongos read path, the $explain option will be ignored. We need to either explicitly error and require clients to use the explain command, or support $explain in the new path.&lt;/p&gt;</description>
                <environment></environment>
        <key id="228200">SERVER-20267</key>
            <summary>Upconvert $explain option for OP_QUERY find to an explain command on mongos</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="9">Done</resolution>
                                        <assignee username="david.storch@mongodb.com">David Storch</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Wed, 2 Sep 2015 19:06:40 +0000</created>
                <updated>Sat, 19 Sep 2015 00:12:02 +0000</updated>
                            <resolved>Thu, 3 Sep 2015 23:58:18 +0000</resolved>
                                                    <fixVersion>3.1.8</fixVersion>
                                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1028106" author="xgen-internal-githook" created="Sat, 12 Sep 2015 01:30:37 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;jrassi&apos;, u&apos;name&apos;: u&apos;Jason Rassi&apos;, u&apos;email&apos;: u&apos;rassi@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20267&quot; title=&quot;Upconvert $explain option for OP_QUERY find to an explain command on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20267&quot;&gt;&lt;del&gt;SERVER-20267&lt;/del&gt;&lt;/a&gt; Move runExplain() to Strategy to fix circular dependency&lt;/p&gt;

&lt;p&gt;libmongoscore intentionally depends on libcluster_query, but prior&lt;br/&gt;
work for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-20267&quot; title=&quot;Upconvert $explain option for OP_QUERY find to an explain command on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20267&quot;&gt;&lt;del&gt;SERVER-20267&lt;/del&gt;&lt;/a&gt; introduced a call to Strategy::commandOp()&lt;br/&gt;
(libmongoscore) from ClusterFind::runExplain() (libcluster_query),&lt;br/&gt;
which created a two-cycle.&lt;/p&gt;

&lt;p&gt;This issue is addressed by moving ClusterFind::runExplain() to&lt;br/&gt;
Strategy::explainFind().&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/69ad8e1a275a3783d139d1b8832d17cad892d4e3&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/69ad8e1a275a3783d139d1b8832d17cad892d4e3&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1022167" author="xgen-internal-githook" created="Thu, 3 Sep 2015 23:56:59 +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-20267&quot; title=&quot;Upconvert $explain option for OP_QUERY find to an explain command on mongos&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-20267&quot;&gt;&lt;del&gt;SERVER-20267&lt;/del&gt;&lt;/a&gt; use the explain command path to answer OP_QUERY with $explain on mongos&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/7a59ba6da674462e7f86a3a7111d58b0721a4138&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/7a59ba6da674462e7f86a3a7111d58b0721a4138&lt;/a&gt;&lt;/p&gt;</comment>
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