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    <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-25058] add countOnConfig() method to Shard so that local count commands can use readAfterOpTime</title>
                <link>https://jira.mongodb.org/browse/SERVER-25058</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The mongos version of removeShard used to call count() on the configs through Shard::runCommand, going through ShardRemote.&lt;/p&gt;

&lt;p&gt;Since Shard::runCommand does not take a readConcern, the readConcern was created externally and provided directly through the cmdObj, and would get processed by the remote shard. (readConcern was necessary for readAfterOpTime).&lt;/p&gt;

&lt;p&gt;The &lt;b&gt;config&lt;/b&gt; version of removeShard will go through ShardLocal, whose runCommand does &lt;b&gt;not&lt;/b&gt; process the readConcern part of the cmdObj.&lt;/p&gt;

&lt;p&gt;Rather than making &lt;b&gt;Shard::runCommand&lt;/b&gt; take a readConcern (which is nonsensical for most generic commands), add a specific countOnConfig() method to the Shard interface, with local and remote implementations.&lt;/p&gt;

&lt;p&gt;To mirror Shard::exhaustiveFindOnConfig, the remote implementation should use grid.configOpTime() to obtain the opTime for the readAfterOpTime part of the readConcern, and the local implementation should use _getLastOpTime().&lt;/p&gt;</description>
                <environment></environment>
        <key id="300980">SERVER-25058</key>
            <summary>add countOnConfig() method to Shard so that local count commands can use readAfterOpTime</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="esha.maharishi@mongodb.com">Esha Maharishi</assignee>
                                    <reporter username="esha.maharishi@mongodb.com">Esha Maharishi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 14 Jul 2016 01:54:01 +0000</created>
                <updated>Sat, 16 Jul 2016 22:35:48 +0000</updated>
                            <resolved>Fri, 15 Jul 2016 21:43:17 +0000</resolved>
                                    <version>3.3.9</version>
                                                    <component>Sharding</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
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