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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-20236] Read preference for an explain routed through mongos does not work on 3.0 for explain-of-count and explain-of-group</title>
                <link>https://jira.mongodb.org/browse/SERVER-20236</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 3.0, the host targeting logic on mongos only works for the explain command if explaining a find operation. If an explain of a count or group operation is routed through mongos with a read preference, the read preference is ignored. As a result, these explains are always delivered to the primary node, even for read preferences like &quot;secondary&quot; or &quot;secondaryPreferred&quot;.&lt;/p&gt;

&lt;p&gt;This has already been fixed in the 3.1.8 development version under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19341&quot; title=&quot;Finalize how read preference and slaveOk are passed for the find command&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19341&quot;&gt;&lt;del&gt;SERVER-19341&lt;/del&gt;&lt;/a&gt;. Therefore, the issue only affects the 3.0 branch. (It does not affect 2.6 or previous versions because find was the only explainable operation in these versions.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="227923">SERVER-20236</key>
            <summary>Read preference for an explain routed through mongos does not work on 3.0 for explain-of-count and explain-of-group</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                    </labels>
                <created>Tue, 1 Sep 2015 14:26:47 +0000</created>
                <updated>Tue, 6 Dec 2022 04:45:18 +0000</updated>
                            <resolved>Mon, 2 Jul 2018 18:32:04 +0000</resolved>
                                    <version>3.0.0</version>
                                                    <component>Querying</component>
                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1937027" author="david.storch" created="Mon, 2 Jul 2018 18:32:04 +0000"  >&lt;p&gt;Closing as Won&apos;t Fix since this issue only affects versions 3.0 and older.&lt;/p&gt;</comment>
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                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="240990">SERVER-21661</issuekey>
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            <issuekey id="215870">SERVER-19341</issuekey>
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                            <attachment id="88335" name="explain_read_pref.js" size="5122" author="david.storch@mongodb.com" created="Tue, 1 Sep 2015 14:27:37 +0000"/>
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